AIDS Behav (2011) 15:1664–1676
DOI 10.1007/s10461-011-0019-7
ORIGINAL PAPER
Adolescent Health-Risk Sexual Behaviors: Effects of a Drug Abuse
Intervention
Hyman Hops • Timothy J. Ozechowski •
Holly B. Waldron • Betsy Davis • Charles W. Turner
Janet L. Brody • Manuel Barrera
•
Published online: 11 August 2011
Ó Springer Science+Business Media, LLC 2011
Abstract Adolescents who abuse substances are more
likely to engage in health-risking sexual behavior (HRSB)
and are at particularly high risk for HIV/AIDS. Thus,
substance abuse treatment presents a prime opportunity to
target HIV-risk behaviors. The present study evaluated a
one-session HIV-risk intervention embedded in a controlled clinical trial for drug-abusing adolescents. The trial
was conducted in New Mexico and Oregon with Hispanic
and Anglo adolescents. Youths were randomly assigned to
individual cognitive behavior therapy (CBT) or to an
integrated behavioral and family therapy (IBFT) condition,
involving individual and family sessions. The HIV-specific
intervention was not associated with change. IBFT and
CBT were both efficacious in reducing HIV-risk behaviors
from intake to the 18-month follow-up for high-risk adolescents. For low-risk adolescents, CBT (versus IBFT) was
more efficacious in suppressing HRSB. These data suggest
that drug abuse treatments can have both preventative and
intervention effects for adolescents, depending on their
relative HIV-risk.
Keywords
HIV-risk
Adolescent Substance-abuse Treatment
Electronic supplementary material The online version of this
article (doi:10.1007/s10461-011-0019-7) contains supplementary
material, which is available to authorized users.
H. Hops (&) T. J. Ozechowski H. B. Waldron B. Davis
C. W. Turner J. L. Brody M. Barrera
Oregon Research Institute, 1715 Franklin Blvd, Eugene,
OR 97403-1983, USA
e-mail: hy@ori.org
M. Barrera
Psychology Department, Arizona State University, Box 871104,
Tempe, AZ 85287-1104, USA
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Resumen Los adolescentes que abusan de sustancias
tienen más probabilidades de involucrarse en comportamientos sexuales de riesgo (HRSB) y están en riesgo particularmente alto de VIH/SIDA. Por lo tanto, el tratamiento
de abuso de sustancias presenta una oportunidad única para
orientar los comportamientos de riesgo de VIH. El presente
estudio evaluó una intervención de un perı́odo de sesiones
de riesgo de VIH en un ensayo clı́nico aleatorio para el
tratamiento de toxicómanos adolescentes. El ensayo se
llevó a cabo tanto en Nuevo México y Oregon, con
adolescentes hispanos y anglos, con evaluaciones al inicio,
después del tratamiento y seguimiento. Los jóvenes fueron
asignados aleatoriamente a dos tipos de tratamiento basado
en la evidencia, una terapia individual cognitivoconductual
(TCC) o un tratamiento integrado del TCC y Terapia de
Familia Funcional (es decir, IBFT) con sesiones individuales y familiares. Los resultados mostraron que la intervención especı́ficas para el VIH no se asoció con el
cambio. Sin embargo, IBFT y TCC fueron eficaces en la
reducción de conductas de riesgo de VIH a partir del
consumo de los adolescentes de 18 meses de seguimiento
de alto riesgo. Para los adolescentes de bajo riesgo, la TCC
fue más eficaz en la supresión de HRSB en comparación
con IBFT. Estos datos sugieren que los tratamientos del
abuso de drogas puede tener efectos preventivos y de intervención de los adolescentes, en función de su relación de
riesgo de VIH.
Introduction
Health-risking sexual behavior (HRSB) among young
people is a national research priority. Nearly two-thirds of
individuals who acquire sexually transmitted diseases
AIDS Behav (2011) 15:1664–1676
(STDs) in the U.S. are under the age of 25 [1]. Although
the estimated number of HIV/AIDS cases decreased among
children under age 13 from 2001 to 2004, increases were
noted in adolescents and young adults up to age 24 [2].
Nearly half of teens are sexually active and a vast proportion of these contacts are unprotected, as evidenced by
extremely low rates of consistent condom use and high
rates of STDs, especially among sexually active youth
between ages 15–19 [3, 4].
A greater understanding of the etiology and treatment of
HRSB among young people are a national research priority
that is closely linked to substance use and abuse. As with
adults, in whom this relationship has been evident for
decades [5, 6], adolescents who abuse substances are more
likely to practice sexually risky behaviors [7–11] and thus
are at particularly high risk for HIV/AIDS or other STDs.
Adult studies [12] found this to be the case for both
injection drug users (IDU) and non-IDUs, the latter most
likely to occur among adolescents. Increasingly, programs
with addiction treatment appear to be one of the best
avenues for providing infection-related healthcare [13].
Moreover, a prime route of access to drug treatment is the
criminal justice system. Given that the majority of adolescent referrals for drug treatment come from this source
[14], adolescent substance abuse treatment, therefore,
presents a prime opportunity for intervention on HIV/AIDS
risk behaviors [15–17].
Treatment for Adolescent Drug Abuse and HIV-Risk
Behaviors
Individual cognitive behavioral model treatments (CBT)
and family-based interventions have garnered substantial
empirical support in controlled clinical trials evaluating
their efficacy for adolescent substance abuse and dependence [18]. Significant reductions in substance use from
pre- to post-treatment and follow-up periods, for both
approaches across multiple studies have been shown [19,
20]. However, interventions for drug abuse in adolescents
have not often examined any potential impact on risky
sexual behavior.
Intervention and prevention efforts directed at individual
change such as CBT have been shown to reduce the incidence of HRSB in adolescent populations and in a variety
of formats [9, 21–24]. Large scale school and community
based programs have been offered with at-risk youth
populations. These structured, small group programs, based
on social learning and cognitive behavioral intervention
models, have focused on providing information on HIVrisk and condom use, development of social skills to
reduce sexual risk-taking behavior, and general cognitivebehavioral skills such as decision-making and assertive
communication. Behavioral findings from these studies
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demonstrate more frequent condom use, fewer sexual
partners [25, 26] and delayed initiation of sexual intercourse [27, 28]. Further, Kirby et al., [29] found that these
curriculum-based programs worked across cultures and
communities. However, with some exceptions, individualbased programs have not realized long-term maintenance
of effects [30] and other more extensive forms of intervention have been recommended [31, 32].
Family-based interventions for risky sexual behavior
have been evaluated in several randomized control trials
(RCT). Prado et al. [33] showed that the inclusion of the
family reduced the incidence of HRSB. Other large scale
programs such as PARE [34] and CHAMP [35] were
successful family interventions targeting both HIV-risk and
early pregnancy prevention with elementary and middle
school students by enhancing family communication,
family decision-making, parent monitoring, and education
about HIV-risk and reproduction. However, programs
offered in health care and medical settings focus more on
prevention aspects and provide services in the context of
addressing other health care needs of adolescents. Other
prevention programs occur in the school and community
context. Although results have been generally modest [31],
significant effects have been noted in increased use of
condoms [36] and behaviors related to risky sexual
behavior such as parent-adolescent communication [37],
parenting behavior [38], and drug use [33]. With few
exceptions [33], the interventions have not shown effects
on risky sexual behavior, not surprising in prevention
studies with somewhat younger populations. Nevertheless,
both individual and family-based approaches have the
potential for reducing HRSB in adolescent populations.
Theoretically, family-based interventions [39, 40], generally conceptualize alcohol and drug abuse as problems
that develop and are maintained in the context of maladaptive family relationships. Consequently, treatment
focuses on improving relationships among all family
members based on the supposition that such improvements
will reduce addictive behaviors and possibly, HRSB as
well. Improved relationships should result in increases in
parent–adolescent communication, and subsequently in
lower levels of drug use. Cognitive-behavioral approaches
conceptualize substance abuse and related problems such
as HRSB as learned behaviors that are initiated and
maintained in the context of environmental factors. Modules often include self-monitoring, avoidance of stimulus
cues, altering reinforcement contingencies, and copingskills training to manage and resist urges to use. In addition, other skills-focused interventions (e.g., drug and
alcohol refusal skills, communication, problem solving,
assertiveness), mood regulation (e.g., relaxation training,
anger management, modifying cognitive distortions), and
relapse prevention are incorporated to promote sobriety
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[41, 42] and foster abstinence or safe sexual practices [9,
25, 43]. Because research on interventions for substance
abuse and HIV-risk behavior has demonstrated the effectiveness of training in similar cognitive-behavioral skills
(e.g., refusal skills), a combined approach offers an
opportunity to treat both problems in a single intervention.
For example, studies with adults have shown marked
reductions in risky sexual behavior following treatment for
drug abuse [5] most likely due to reductions in behaviors
that are mediators of HIV-risk such as multiple sex partners, unprotected sex and drug use [44].
Moderators of Treatment Effects: Level of HIV-Risk
and Ethnicity
Although prevention and intervention efforts for HIV-risk
behaviors have been demonstrated, what is less well
understood is the impact of an intervention on different
subgroups of individuals, such as those with low versus
elevated HRSB, and those in different racial/ethnic groups.
For example, several studies have shown that interventions
may be more effective for sexually experienced youth as
opposed to those less experienced [45, 46], although
positive effects have been shown for the latter as well [45].
Thus, interventions that have both preventative (suppressing normal increases in risky sexual behavior) and intervention effects (reducing frequency of these behaviors)
could be considered more desirable.
HIV infection rates are especially high for ethnic
minorities [15, 47]. Hispanics have the second highest rate
of AIDS and Hispanic adolescents account for 18% of
those diagnosed with AIDS [2]. Hispanic youth also report
higher use of drugs compared to non-Hispanic whites or
Anglos [48, 49] increasing the likelihood of problematic
sexual behavior. Early sexual initiation, multiple partners
and lower condom use have all been shown to be more
problematic for Hispanic youth than non-Hispanic whites
[2, 50], all of which are significant predictors of STDs and
HIV. Yet, with some exceptions [45, 51], there has been a
paucity of well-designed interventions to reduce HRSB
among Hispanic youth. Villarruel et al. [51] found that a
2-day culturally specific group intervention compared to a
health-promotion control condition, did significantly
reduce the frequency of sexual intercourse, number of
partners, and simultaneously increase the frequency and
consistency of condom use during sexual activity over a
12-month follow-up period. However, their intervention, as
did most others, occurred within the context of the school
and generally did not focus on drug use as a related
behavior. Villaruel et al.’s [51] health promotion control
condition included a focus on drug use but did not report
any effects on drug behavior. Several studies have examined drug abuse interventions or integrated drug abuse and
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AIDS Behav (2011) 15:1664–1676
HIV interventions among juvenile offenders [9, 17], but
most of these were within residential settings with effects
assessed after discharge. More recently, Liddle et al. [52]
reported a family-based intervention that moved from
detention to the community, but no impact on risky sexual
behavior was offered.
The Current Study
The present study evaluated an HIV-risk intervention that
was imbedded in a large-scale RCT for drug abusing
adolescents. A 1-session HIV-risk module was provided
during the latter part of the drug intervention. The trial was
conducted in both New Mexico and Oregon with both
Hispanic and Anglo adolescents who had been referred for
drug abuse and/or dependence. Two types of interventions
were conducted for drug abuse, an individual CBT [20] and
an integrated model that combined aspects of both family
therapy and individual CBT. In the Integrative Behavioral
and Family Therapy (IBFT) [18, 53] model, the familybased sessions followed Functional Family Therapy (FFT)
[39, 54], a widely disseminated, highly effective intervention for youth presenting with a variety of problems that
has been shown to be efficacious for drug-abusing youth
[20]. Core individual CBT sessions (e.g., coping with urges
and cravings, substance refusal skills) were included in the
course of IBFT. Prior research has supported combining
family and individual CBT strategies [55, 56]. The HIVrisk module was implemented near the end of treatment for
adolescents in both conditions. However, not all participants received the module because of attrition or an
incomplete course of therapy. It was hypothesized that
adolescents receiving the HIV-risk module would show
significant reductions on a range of risky sexual behaviors
following substance abuse treatment.
Methods
Sample Characteristics and Recruitment Procedures
Adolescents were referred to our clinics for outpatient
substance abuse treatment. Primary referral sources included the juvenile justice system, the public school system,
community-based service providers (e.g., hospitals, clinics,
youth and family social services) and local advertisements.
Eligibility criteria for adolescent participant in the study
were (a) ages 13–19, (b) DSM-IV diagnostic criteria for
substance abuse or dependence, and (c) residing with at
least one parent or legal guardian willing to participate in
the clinical and research procedures. Adolescents excluded
from the study were referred elsewhere for treatment given
evidence of (a) a psychotic disorder or condition, or (b) the
AIDS Behav (2011) 15:1664–1676
need for more restrictive or intensive services. Of the 263
adolescents enrolled in the clinical trial, the sample for the
current study (n = 225) included only adolescents who
received at least a minimal dose of four treatment sessions,
had complete data on at least one of the post-treatment
assessments and were of either Anglo or Hispanic
ethnicity.
Sixty percent of the study sample was recruited from
greater Albuquerque, NM with the remaining 40% from
Salem, Woodburn and Portland, Oregon. The adolescent
sample was 83% male (consistent with most treatment
studies of drug abuse), ranged in age from 13 to 19 years
(M = 15.8; SD = 1.21), with 51% of Hispanic ethnicity
and the remainder White non-Hispanic or Anglos. None of
the Hispanic adolescents was monolingual Spanish speaking; however, nearly half of the Hispanic parents preferred
or spoke Spanish, and were provided with questionnaires,
interviews, and therapy sessions in Spanish.
Adolescents accepted into the study reported substance
use (other than tobacco) an average of 46.0 % (SD = 30.5)
of the previous 90 days. The most frequently used substances were marijuana (M = 41.6%, SD = 32.3) and
alcohol (M = 7.6%, SD = 10.1). With respect to other
problem behaviors, 62.7% of the sample scored at or above
the clinical threshold for delinquent behavior problems on
the Achenbach Child Behavior Checklist (CBCL) [57], and
39.6% scored at or above the threshold for mild-to-moderate clinical depression on the Beck Depression Inventory
(BDI) [58]. In terms of sexual behavior, 69.3% of the
adolescents reported at least one lifetime incident of sexual
intercourse. The mean age of first sexual intercourse was
14.1 years (SD = 1.7), and the number of lifetime sexual
partners ranged from 1 to 40 (M = 5.0, SD = 5.9, median = 3, mode = 1). In the 90-day period prior to entry
into the study, 48.0% of the adolescents reported having
had sexual intercourse at least once with the number of
partners ranging from 1 to 15 (M = 1.8, SD = 1.9, median = 1, mode = 1).
Treatment Conditions
Participants were randomly assigned to either CBT or
IBFT. Given the range of risky sexual behaviors commonly
reported among drug abusing adolescents, the CBT and
IBFT drug interventions were augmented with a brief
1-session HIV-risk education and behavioral skills training
intervention. Each treatment consisted of approximately 14
weekly sessions averaging 60 min in length. All therapy
sessions were video recorded for purposes of clinical
supervision and therapist adherence monitoring.
The CBT intervention utilized in the study was a cognitive-behavioral skills training program designed to teach
individual adolescents psychosocial and behavioral self-
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management and coping skills for reducing drug use [59,
60]. CBT consisted of three distinct clinical phases: motivational enhancement, skills training, and relapse prevention. The supplemental HIV module was embedded within
the skill-building phase of treatment. Specific objectives
and tasks during CBT included: (a) identifying and recognizing high-risk behaviors and situations, (b) coping
with urges and cravings, (c) learning effective communication and problem-solving skills, (d) managing anger and
depression, (e) acquiring and practicing drug refusal skills,
and (f) setting goals for educational and vocational
achievement. During the relapse prevention phase of CBT
[41], the focus was on consolidating newly acquired skills,
practicing alternatives to substance use, and strengthening
attachments with non-substance using peers.
The IBFT treatment integrated components from individual CBT and family-based models within a unitary
intervention. The family-focused sessions in IBFT were
adapted from the FFT model, a behaviorally oriented
approach developed for high-risk youth and their families
[39, 61]. The IBFT condition included a mix of individual
and family therapy sessions. The first four were family
therapy sessions designed to engage and motivate all
family members to participate in treatment. The following
10 sessions were behavioral skill-building sessions that
were conducted with the adolescent alone or with the
family. Family skill building sessions focused on communication and relationship quality between family members,
problem solving, and affect regulation. The individual CBT
sessions included a functional analysis of drug use behavior
and an individually selected set of core CBT skills such as
coping with urges and cravings and relapse prevention. As
with CBT, the supplemental HIV module was embedded
within the skill-building phase of treatment.
The HIV module focused on providing knowledge and
skills for identifying and avoiding high-risk sexual
behaviors and activities [62]. Although sexual abstinence is
the most obvious method of preventing sexual transmission
of HIV, a substantial proportion of adults and adolescents
fail to adopt this strategy [63–65]. Thus, for most people
who are not celibate, appropriate and consistent use of
condoms represents the most effective strategy to reduce
risk of exposure to HIV [66, 67]. Risk was conceptualized
along a continuum from activities very high in risk
(unprotected intercourse) to those that pose lesser risk
(condom-protected intercourse) to those in which neither
partner is at risk (hugging, massage).
The HIV education plus skills training module was
adapted from the program used by Kamb et al. [68] for
Project RESPECT, a RCT for risk reduction of HIV and
other STDs. As part of the HIV education session, the
therapist conducts a risk assessment individually tailored
to the clients’ HRSB, similar to a functional analysis of
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high-risk drug behaviors. By combining the risk assessment with information about HIV-risk and adolescents’
beliefs about reducing risk, the therapist is able to identify
cues that increase risk for HIV and target the positive and
negative consequences of risky behavior. The therapist also
identifies HIV preventive behaviors and explores strategies
for adoption. Once the situations and problems associated
with risky behaviors are identified, whether substance use
or HIV, coping strategies and other skills needed to manage
high risk situations or promote healthier choices can be
targeted for skill training and performance in each of the
individual skill training modules of the two interventions
wherever appropriate.
Therapist Characteristics
Therapists consisted of six women and two men, two of
whom were Hispanic. All were fluent in English and four
also fluent in Spanish. Therapists either had a masters or
PhD degree in clinical or counseling psychology and all
received cultural sensitivity training to work with families
from Hispanic and Anglo cultures.
AIDS Behav (2011) 15:1664–1676
contained 22 items assessing whether and in some cases the
extent to which adolescents engaged in an array of
behaviors elevating one’s risk of exposure to HIV and
other STDs over one’s lifetime and/or over the past
90 days. However, only items that could assess change
over time (i.e., could occur in the past 90 days) were used
in the analysis, resulting in a final set of 17 items. At
pretreatment, the scale’s Cronbach’s alpha coefficient was
0.81.
The POSIT HIV-risk scale has been used primarily in
studies relating adolescent drug use or abuse to HIV-risk
behaviors. Singer et al. [73] found that adolescents currently using MDMA (ecstasy) were significantly more
likely to engage in a variety of POSIT HIV-risk
behaviors compared to non-MDMA users. Similarly,
adolescents in juvenile detention, at high risk for HIV
reported significantly higher levels of delinquent behavior and substance use compared to adolescents classified
at low risk [74]. Finally, an unpublished 11-item version
of the scale was tested on a multi-site sample of 1,418
adolescents from community and clinical settings [75].
The reduced version was found to correlate significantly
with measures of substance use and impulsivity among a
sample of older adolescents with histories of early
behavioral problems.
Research Procedures
Upon receiving informed consent/assent from each parent/
adolescent pairing, adolescents were randomly assigned to
the CBT or IBFT condition. Assessments were conducted
at intake and at 5, 8, and 18 months after treatment initiation. Assessments included the adolescent, both parents
and one sibling over the age of 13, when available. All
clinical and research procedures were approved by the
Oregon Research Institute’s institutional review board.
Figure 1 illustrates the study design and flow of participants through the study.
Measure of HIV-Risk Behavior
Involvement in HIV-risk behavior was assessed using a
modified version of a screening instrument developed by a
National Institute on Drug Abuse (NIDA) workgroup [69]
as a supplement to the Problem-Oriented Screening
Instrument for Teenagers (POSIT) [70–72]. We obtained a
27-item version of the POSIT HIV scale from the instrument’s developer (E. Rahdert, written communication,
June 28, 2000). From this version, we trimmed five items
assessing risk factors not directly pertaining to sexual
behavior or drug use by needle injection including alcohol
use, emotional problems, and family support. The version
of the POSIT HIV-risk scale administered to participants
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Analysis Plan
We examined change in the probability of engaging in each
HIV-risk behavior using piecewise logistic growth curve
(PLGC) models (see Supplementary materials for complete
description of the PLGC modeling procedure). In the
PLGC analysis, we tested differences in the mean change
of the probability of each HIV-risk behavior during and
after treatment between each of the following groups,
separately, (a) adolescents who did and did not receive the
HIV-risk module, (b) the IBFT and the CBT treatment
conditions, and (c) Anglo and Hispanic adolescents. Differences between groups were modeled by adding indicator
variables for group membership as independent predictors
within the PLGC model.
Prior to conducting the PLGC analysis, we partitioned
the sample into two subgroups representing distinct levels
of risk for HIV at treatment entry [74]. This subgroup
classification was performed by means of a latent class
analysis (LCA) of the POSIT HIV-risk indicators at the
pre-treatment assessment. Briefly, LCA is a semi-parametric statistical procedure for modeling unobserved or
latent class membership based on a set of observed variables [76–78]. Upon completing the LCA, the PLGC
modeling portion of the analysis was executed separately
within each HIV-risk latent class.
AIDS Behav (2011) 15:1664–1676
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Fig. 1 Flow chart of
participants through phases of
randomized clinical trial
Results
Missing Data
Pretreatment HIV-Risk Behavior
Among the 225 adolescent participants in the study, 52.4%
had complete data across all four assessments whereas
47.6% had missing data on at least one assessment.
Overall, the percentage of cases with completely missing
data at the intake, 5-, 8-, and 18-month assessments were
1.3, 19.1, 20.9, and 25.4%, respectively. We addressed
missing data using multiple imputation (MI; see Supplementary materials for MI procedure and results).
\We examined the percentage of the sample that provided
a ‘‘yes’’ response at pre-treatment to the 17 items from
the POSIT HIV-risk scale assessing the occurrence of
high-risk behavior over the past 90 days. Response rates
for 11 of the 17 items were less than 10%. We regarded
the six highly endorsed items, (a) vaginal sex, 48.0%,
(b) oral sex, 40.0%, (c) close friends have sex, 46.2%,
(d) sex without a condom, 32.1%, (e) sex while high on
drugs or alcohol, 26.3%, and (f) multiple sex partners,
19.7%, as representing the primary profile or repertoire of
HIV-risk behaviors characterizing the substance-abusing
adolescents in the sample. (Response rates for all 17 items
are displayed in Supplement Table S1). Accordingly, with
one exception (see ‘‘Latent class analysis’’ below), statistical analyses focused on this primary subset of six
items.
Latent Class Analysis
Inspection of the response patterns across the six primary
POSIT HIV-risk items revealed that 61 of the 225 adolescents (27.1%) did not endorse any items at treatment
entry whereas the remaining 164 adolescents (72.9%)
endorsed at least one. We hypothesized that (a) the 61
adolescents in the former group represented a distinct
subgroup exhibiting inordinately low levels of risk for HIV
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AIDS Behav (2011) 15:1664–1676
Table 1 Mean predicted probabilities of engaging in HIV-risk behaviors at each assessment based on the results of the PLGCMs among
adolescents at high risk for HIV
HIV risk behavior
Group
Predicted mean probabilities
Pre-treatment
5 months
8 months
18 months
Vaginal sex
All youth
0.91
0.95
0.94
0.94
Oral sex
Anglo
0.89
0.96
0.91
0.83
Sex while high
Hispanic
CBT
0.84
0.85
0.88
0.95
0.93
0.62
0.96
0.13
IBFT
0.72
0.77
0.65
0.52
0.74
Close friends have sex
Anglo
0.94
0.81
0.78
Hispanic
0.85
0.58
0.70
0.81
Multiple sex partners
All youth
0.58
0.35
0.28
0.23
Sex without a condom
All youth
0.58
0.44
0.48
0.52
relative to those endorsing at least one of the six HIV-risk
indicators, and (b) adolescents entering treatment at
exceptionally low levels of risk for HIV might exhibit
qualitatively different responses to treatment than those
entering treatment at higher levels of risk. This hypothesis
is consistent with numerous clinical studies of adolescent
problem behavior in which different patterns and levels of
response to treatment have been observed between subgroups entering treatment at distinct levels of risk or
problem severity [79, 80].
To investigate the possibility of subgroups exhibiting
distinct levels of HIV-risk at treatment entry, we fit a series
of LCA models to selected POSIT HIV-risk items at the
pre-treatment assessment (see Supplementary materials for
full description of the LCA procedure and results). Results
indicated that a 2-class LCA model provided the best fit to
the data, with the majority of adolescents being classified
as low-risk for HIV (n = 153) and a smaller subgroup
being classified as high-risk (n = 72).
Modeling Trajectories of Change in Sexual Behavior
The next phase of the analysis was to estimate trajectories
of change for the six highly endorsed POSIT items among
adolescents in the high- and low-risk latent classes, independently. As noted previously, change in HRSB was
analyzed using a PLGC modeling strategy.
High-Risk Latent Class Analysis
Perhaps the most striking pattern of findings is that the
probability of engaging in three of the six risky behaviors
decreased between the pretreatment and 5-month assessments. Specifically, significant decreases during treatment
were evident in the unconditional models for close friends
have sex (c10 = -1.81, SE = 0.53, P \ 0.01), multiple
sex partners (c10 = -0.95, SE = 0.40, P \ 0.05), and sex
123
without a condom (c10 = -0.60, SE = 0.30, P \ 0.05).
These mean decreases were evident across all adolescents
regardless of whether the HIV intervention was received,
treatment condition, or ethnicity. No other conditional or
unconditional effects were evident during treatment on any
POSIT HIV-risk dependent variable.
In contrast to the absence of group-specific effects
during treatment, differences between groups were more
evident during the post-treatment period. In particular, the
probability of engaging in sex while high decreased significantly in the CBT condition (c21 = -1.84, SE = 0.75,
P \ 0.05) compared to the IBFT condition in which the
corresponding trajectory was relatively flat (c20 = 0.58,
SE = 0.40). Additionally, significant differences between
ethnic groups were evident during the post-treatment
period for the probability of engaging in oral sex
(c21 = 1.32, SE = 0.62, P \ 0.05) and close friends have
sex (c21 = 0.78, SE = 0.37, P \ 0.05). Both of these
findings indicate a significant increase among Hispanic
compared to Anglo adolescents, for whom the probability
of engaging in each behavior remained relatively stable
(c20 = -0.78, SE = 0.49, and c20 = -0.22, SE = 0.27,
respectively). No other conditional or unconditional effects
were evident during the post-treatment period on any
POSIT HIV-risk dependent variable. Table 1 presents the
predicted mean trajectories of change in the probability of
engaging in each of the HIV-risk behaviors for which
significant results were obtained in the PLGM. The mean
probabilities, expressed on a log-odds scale, were computed by exponentiating the PLGM estimates.
Low-Risk Latent Class Analysis
The most noteworthy pattern of findings for the low-risk
group is the beneficial effect of CBT compared to IBFT in
delaying or preventing increases in several risky behaviors.
Specifically, significant increases were observed during
AIDS Behav (2011) 15:1664–1676
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treatment for IBFT in the probability of vaginal sex
(c10 = 2.20, SE = 0.49, P \ 0.001) and multiple sex
partners (c10 = 3.76, SE = 0.96, P \ 0.001). In contrast,
in CBT these mean increases were largely negated
(c11 = -1.58, SE = 0.64, P \ 0.05 for vaginal sex, and
c11 = -2.45, SE = 1.16, P \ 0.05 for multiple sex
partners).
In addition to these treatment condition effects, significant overall increases in the probability of engaging in oral
sex (c10 = 1.31, SE = 0.33, P \ 0.001) and sex while high
(c10 = 2.31, SE = 0.76, P \ 0.01) were found between the
pretreatment and 5-month assessments. These increases
were unrelated to whether or not the HIV intervention was
received, treatment condition, or adolescent ethnicity. No
other conditional or unconditional effects were evident
during treatment on any POSIT HIV-risk dependent
variable.
Similar to the during-treatment results, a preventative
effect of CBT was evident during the post-treatment period. Specifically, the probability of engaging in sex without
a condom decreased significantly in CBT (c11 = -0.86,
SE = 0.41, P \ 0.05) relative to IBFT in which the
probability remained relatively stable (c10 = 0.48,
SE = 0.28). Contrary to this result, however, the preventative effect of CBT on change in the probability of vaginal
sex, evident during treatment, appeared to erode during the
post-treatment period (c11 = 0.82, SE = 0.32, P \ 0.05)
relative to IBFT in which the probability remained flat
(c10 = -0.06, SE = 0.24).
In addition to these treatment condition effects, a significant difference between ethnic groups was evident
during the post-treatment period for the probability of
engaging in sex without a condom which showed a significant increase among Hispanics (c21 = 0.86, SE = 0.41,
P \ 0.05) relative to Anglos among whom the probability
remained relatively stable (c20 = -0.43, SE = 0.36). In
addition, an overall significant increase in the mean probability of close friends have sex was obtained between the
pretreatment and 5-month assessments (c21 = 0.62,
SE = 0.23, P \ 0.05). No other conditional or unconditional effects were evident during treatment on any POSIT
HIV-risk dependent variable. Table 2 presents the predicted mean trajectories of change in the probability of
engaging in each of the HIV-risk behaviors for which
significant results were obtained in the PLGM among
adolescents entering treatment at low risk for HIV.
Discussion
The current study compared the effectiveness of two adolescent drug abuse treatments (CBT and IBFT) on HIV-risk
behaviors, and in a quasi-experimental design, examined
the additional impact of a brief HIV-risk module embedded
within each of the primary interventions. Despite the
absence of any effect of the HIV-specific intervention
module, significant effects were noted for both of the
interventions on HIV-risk behavior with effects dependent
upon whether participants were (a) in the high versus lowrisk groups, or (b) members of the Anglo versus Hispanic
ethnic groupings. Specifically, the results indicated that
CBT was more efficacious than IBFT in suppressing HIVrisk behaviors among both high- and low-risk participants.
Among high-risk youth, however, both interventions were
associated with signification reductions in three risk
behaviors, sex without a condom, close friends have sex
and multiple sex partners from pre to post-treatment with
sustained effects up to the 18-month assessment for the first
two. CBT also showed superior effects compared to IBFT
for having sex while high but only in the post-treatment
Table 2 Mean predicted probabilities of engaging in HIV-risk behaviors at each assessment based on the results of the PLGCMs among
adolescents at low risk for HIV
HIV risk behavior
Vaginal sex
Group
Predicted mean probabilities
Pre-treatment
5 months
8 months
18 months
CBT
0.05
0.40
0.59
0.75
0.69
IBFT
0.22
0.72
0.70
Oral sex
All youth
0.15
0.39
0.45
0.50
Sex while high
All youth
0.01
0.13
0.15
0.18
Close friends have sex
All youth
0.20
0.11
0.18
0.29
Multiple sex partners
CBT
IBFT
0.00
0.01
0.06
0.18
0.07
0.16
0.09
0.15
0.08
Sex without a condom
Anglo
0.11
0.15
0.11
Hispanic
0.07
0.13
0.18
0.26
CBT
0.15
0.15
0.11
0.08
IBFT
0.13
0.13
0.20
0.29
123
1672
follow-up period. However, the long-term decrease in sex
under the influence of drugs showed a significant decrease
for both conditions although a greater reduction was found
for CBT.
Among the low-risk participants, in general, increases in
four of the six risk behaviors were found consistent with
expected developmental patterns. However, despite
increases in vaginal sex to about 70%, sex without a condom remained quite low and under 30%. Moreover, CBT
appeared to suppress effects of the increases in vaginal sex
and multiple sex partners observed in the IBFT condition
from pre to post treatment, although these effects appear to
be short-lived. CBT also showed post treatment effects for
sex without a condom. Overall, despite significant increases in vaginal sex to near 80%, sex without a condom never
rose above 30% suggesting the interventions did have some
long-term impact on the low-risk adolescents.
The pattern of findings has several important implications for both treatment and prevention activities. For
example, an HIV-specific intervention may not be necessary to target specific risky sexual behaviors among highor low-risk adolescents. Rather, the results suggest that
some evidence-based treatments designed to target drug
use and associated risk factors more generally may be
sufficient to reduce or prevent the expected increase in
HRSBs among drug-abusing adolescents. This implication
is consistent with the notion that drug abuse and risky
sexual behaviors are represented within a constellation of
problem behaviors among youth [7]. A number of investigators have suggested that adolescent problems such as
drug abuse, HIV-risk behaviors, and other conduct problems may not constitute independent disorders or problems
but may represent deviant behaviors that are part of a
known developmental trajectory [81]. Many adolescents
with these disorders have common behavioral skill deficits,
as in poor problem solving, limited coping strategies, low
motivation for change or low self-efficacy. The focus on
changing these skill deficits, especially via the CBT
intervention, may act to reduce related behavioral problems
such as those associated with drug abuse and HIV-risk.
Consequently, drug abuse treatments with demonstrated
efficacy [18] may in fact be affecting a host of risk and
protective factors associated with risky behaviors, including those associated with HIV infection and other STDs
during a critical developmental period. Moreover, the
effects of the interventions appear to be maintained up to
18 months after intake or approximately 1 year after
treatment ended. The durability of the changes observed for
HIV-risk reductions is similar to the maintenance of drug
use reductions over time [18]. Further, the data show that
interventions for drug abuse can have both preventative
and intervention effects for adolescents who are less and
more sexually active, respectively. Such effects have the
123
AIDS Behav (2011) 15:1664–1676
potential for informing similar treatment programs for
drug-abusing adolescents.
Earlier, we noted that mediators of reductions in HIVrisk behaviors could be improved relationships within the
family as a function of family therapeutic approaches or
skill building via CBT. Another important mediator of
reductions in risky sexual behavior is the use or abuse of
drugs. Adolescent and adult studies show that drug use
interferes with cognitive processes such as decision-making and increases impulsivity, both of which act to increase
the likelihood of high-risk sexual practices. Whether these
mediators performed as predicted in the current study will
be the focus of future analyses.
The differential effects for low-risk and high-risk adolescents are particularly interesting and are similar to the
results of several other studies that have targeted HIV-risk
behaviors. Both Kirby et al. [45] and Jemmott et al. [46]
found that their interventions had greater effects for more
sexually experienced youth. The population of drug-abusing adolescents served here appeared to consist of two
distinct populations, those who were more sexually active
and also at higher current risk for HIV and other STDs, and
those who were less sexually active. For the former, significant decreases in three behaviors, frequently found to be
associated with a host of sexually transmitted diseases were
found from pre to posttreatment. Further, multiple sex
partners continued to decline while sex while high,
although not showing an immediate intervention effect,
dropped considerably by the 18-month assessment. These
two behaviors showed significant decreases of 35 and 46%,
respectively, 18 months after intake. While other programs
have demonstrated similar or greater increases [45, 51],
neither of these studies examined drug-abusing populations
considered at higher risk for HIV or STD infections or had
interventions that were directed at related behaviors, not
HIV-risk per se.
The effects for the low-risk or less sexually experienced
adolescents did not show significant reductions in HRSB,
in part due to their lower baseline levels and greater variability. However, despite significant increases in both
vaginal and oral sex, we did not see similar increases in the
other risky behaviors from post-treatment to the 18-month
follow-up as might be expected developmentally. For
example, despite nearly 70% of the participants reporting
vaginal intercourse, less than 30% reported having sex
without a condom. Further, differential treatment effects
were noted for this group with CBT showing more suppressive effects compared to IBFT for multiple partners
and sex without a condom. Perhaps, the different social
contexts of the treatments accounted, in part, for the
stronger CBT effects. For example, although the HIV-risk
module was an individual session in both CBT and IBFT,
IBFT involved relatively few individual sessions, with the
AIDS Behav (2011) 15:1664–1676
majority of sessions held conjointly with the family. The
exclusive individual focus of CBT and the greater number
of individual sessions may have led adolescents in CBT to
develop a stronger therapeutic bond that made discussing
sexually related behaviors or other concerns more comfortable. Alternatively, the greater focus on skill building in
the CBT sessions may have led to increased coping skills in
adolescents compared to youth in IBFT, and the increased
skills provided a foundation for change in a variety of
HSRBs. Possibly, the strengths of the therapeutic relationship and skill acquisition are particularly important for
low-risk youth and may have accounted for the suppression
of HIV-risk behaviors in this group.
The single behavior that showed differential results for
the low-risk group in favor of Anglos was somewhat surprising. Guzman et al. [82] noted that discussions of sexual
behavior in Hispanic families may be more difficult given
different cultural norms. However, no family discussions of
sexual behavior were planned and other studies of family
involvement in HIV-risk prevention have occurred with
positive results [33]. Further, condom use among Hispanics
is generally higher than among whites [83]. Interventions
may have to focus on different negotiation strategies for
Latinos compared to non-Hispanic whites [84]. Thus,
explanation of the results here will require further
exploration.
The similarity of HIV-risk outcomes for both Hispanic
and Anglo adolescents among the high-risk youth is noteworthy. Although there were differences between Hispanic
and Anglos in oral sex, both were quite high even after
intervention. Similarly, Anglos responded more positively
to the intervention in terms of having sexually involved
friends but this too dissipated by the 18-month assessment.
Cultural differences did not appear to play a role in treatment responding. These data are similar to the results of
other studies that compared the effects of an intervention
on different cultural/ethnic/racial groupings. For example,
Kirby et al. [45] showed that although Hispanics improved
more than nonHispanic Whites with respect to delaying
initiation into sex, both Hispanics and White students
showed significantly greater increases in their condom use
at last sex compared to Blacks. The power of interventions
to effect change across cultural/ethnic groupings may be
due to their focus on common cross-ethnicity variables.
Further research will be necessary to demonstrate whether
this is so. Clearly, the development of prevention programs
and treatments that are efficacious across ethnic cultural
groupings is more efficient than the development of a wide
array of culturally specific interventions [51]. Each new
culturally specific treatment requires independent evaluations to establish an empirical foundation, whereas existing
evidence-based practices can be tailored or implemented in
a culturally sensitive manner without sacrificing treatment
1673
fidelity [85, 86]. Lending support to this idea, sessions in
the current study were conducted in Spanish for all youth
and families who preferred therapy to be conducted in their
native language by therapists who had received cultural
sensitivity training as part of the clinical trial protocol.
Thus, both evidence-based practices were tailored to participants’ ethnic culture without modifying the elements of
the treatment models themselves. Because so few studies
have been conducted examining treatment outcomes across
racial/ethnic groups the question of culturally specific
versus culturally sensitive interventions has not been
resolved. The current findings are promising, however,
suggesting that some interventions for HSRBs may be
efficacious across ethnic groups.
Limitations
Adolescents were randomly assigned to CBT or IBFT but
not to different HIV-risk reduction interventions. Thus, we
recognize that we cannot directly attribute changes to the
clinical treatments since some non-experimental factor
may have produced changes in both conditions. However,
our analyses by level of risk were similar to those contained in other studies with similar outcomes. We also used
a brief HIV-intervention that was coordinated with the drug
abuse treatments. A more comprehensive HIV-risk component might have produced stronger effects than those
reported here. In addition, we found only one significant
predictor of receiving the HIV-risk module in each risk
group, which did not appear to account for possible differences in outcome. Further research will be required that
randomly assign participants on the basis of HIV-risk
behaviors to specific treatments.
It is also possible that substantial decreases among the
high-risk group and similar increases among the low-risk
group are simply regression to the mean effects. However,
the changes noted in the current study were not all in the
direction that would be predicted by regression effects.
Some differences were noted as a function of the type of
intervention with CBT showing greater suppression effects
than IBFT. Further, not all variables showed dramatic
increases among the low-risk group. As noted above,
although oral and vaginal sex showed increases that were
2–3 times that of pretreatment, the other variables
remained relatively low and differential treatment effects
noted there as well.
Finally, the current analysis examined change in six
HIV-risk items separately within two latent classes of
adolescents. Consequently, a large number of statistical
tests were performed which elevates the risk of Type-I
error (i.e., obtaining significant findings by chance). For
this reason, the findings reported here should be interpreted
cautiously, especially those at the P \ 0.05 level of
123
1674
significance. Specific results that appear to form a pattern
across items, however, are substantially less likely to be
due to random chance. As discussed previously, in the
current analysis several relatively stable patterns of findings emerged including the overall reduction in the probability of engaging in HIV-risk behaviors over time among
adolescents in the high-risk latent class, as well as the
general superiority of CBT over IBFT in reducing the
probability of HIV-risk behavior over time among adolescents in the low-risk latent class.
Despite these limitations, this was the first study conducted in outpatient treatment for drug abusing adolescents
with a focus on HIV-risk behaviors. Even though the
specific treatment directed at risky sexual behaviors did not
prove to be efficacious, this does not detract sufficiently
from the general outcome showing that drug abuse treatment itself can be effective for reducing or preventing
HIV-risk behaviors in drug-abusing adolescents.
Acknowledgments We gratefully acknowledge the contributions of
Gael Johnson in the preparation of this article, the many families that
participated in this research, and the therapists and research assistants
who made this work possible. This manuscript was supported
by National Institute on Drug Research Grants R01DA13350,
R01DA13354.
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