© 2007 American Public Health Association DOI: 10.2105/AJPH.2005.076182
The authors are with the Prevention Research Branch, Division of HIV/AIDS Prevention, National Center for HIV, STD, and TB Prevention, Centers for Disease Control and Prevention, Atlanta, Ga. Correspondence: Requests for reprints should be sent to Cynthia M. Lyles, Prevention Research Branch, Division of HIV/AIDS Prevention, National Center for HIV, STD, and TB Prevention, Centers for Disease Control and Prevention, 1600 Clifton Rd, Mail Stop E37, Atlanta, GA 30333 (e-mail: clyles{at}cdc.gov).
Objectives. The Centers for Disease Control and Preventions HIV/AIDS Prevention Research Synthesis Team conducted a systematic review of US-based HIV behavioral intervention research literature from 2000 through 2004 to identify interventions demonstrating best evidence of efficacy for reducing HIV risk. Methods. Standard systematic review methods were used. Each eligible study was reviewed on the basis of Prevention Research Synthesis Team efficacy criteria that focused on 3 domains: study design, implementation and analysis, and strength of evidence. Results. Eighteen interventions met the criteria for best evidence. Four targeted HIV-positive individuals. Of those targeting populations at risk for HIV, 4 targeted drug users, 6 targeted adults at risk because of heterosexual behaviors only, 2 targeted men who have sex with men, and 2 targeted youths at high risk. Eight interventions focused on women, and 13 had study samples with more than 50% minority participants. Significant intervention effects included increased condom use and reductions in unprotected sexual intercourse, number of sexual partners, injection drug use or needle sharing, and newly acquired sexually transmitted infections. Conclusions. Most of the best-evidence interventions are directly applicable for populations in greatest need of effective prevention programs; however, important gaps still exist.
The United States continues to experience steady increases in the estimated numbers of persons living with HIV/AIDS and relatively stable overall trends in HIV diagnoses.1,2 Given the challenges of further reducing HIV infection rates and developing an effective vaccine,3,4 it is critical to focus on behavioral prevention efforts that are based on the best available scientific evidence. The Institute of Medicine has called for evidence-based deci-sionmaking across all public health sectors5 and recommends that HIV-prevention efforts utilize interventions of proven efficacy to avert as many new infections as possible.6 In accordance with the Institute of Medicine, the Centers for Disease Control and Prevention (CDC) emphasizes evidence-based behavioral interventions as part of its national HIV-prevention strategic plan and recommends that health departments7,8 and community-based organizations9 implement evidence-based behavioral interventions. Given the vast amount and heterogeneity of scientific literature available, identifying evidence-based behavioral interventions is a daunting task. The complexity and variation in study designs, evaluation methods, analytic approaches, and data reporting make it extremely difficult to assess the quality of, and interpret the findings from, an evaluation study. As a result, an entire area of research has focused on reviewing the quality of individual studies and grading the totality of the scientific evidence for decisionmaking.1015 Therefore, it is unrealistic to expect all HIV-prevention providers to be able to critically evaluate the literature and accurately identify interventions with proven efficacy. For this reason, the identification of evidence-based behavioral interventions would serve as a valuable resource for those responsible for developing national, state, and local HIV prevention plans. Many investigators have performed quantitative systematic reviews, including meta-analyses, to estimate the overall effectiveness of subsets of HIV interventions1623 or qualitative systematic reviews to identify effective strategies within a particular subgroup of individuals.2427 To our knowledge, none has sought to systematically review the literature across all populations to identify each HIV behavioral intervention that met rigorous scientific criteria and demonstrated efficacy. The CDCs HIV/AIDS Prevention Research Synthesis (PRS) Team developed such a process, which utilized standard systematic review methods.28,29 The evidence-based interventions identified in the first PRS review from 1988 to 1996 were published in the Compendium of HIV Prevention Interventions With Evidence of Effectiveness.30 This Compendium was later updated to include proven interventions published up to 2000.31 The selection criteria used in the Compendium30,31 reflected the state of the science at that time, and neither the criteria nor the findings have been updated in several years. In an effort to update previous work and focus on the most relevant scientific evidence reflecting the current state of the HIV epidemic, the PRS Team conducted a systematic review of the US-based HIV behavioral intervention research literature from 2000 through 2004. The purpose of our review was to help CDCs HIV-prevention partners with their strategic planning process by evaluating the quality of scientific evidence from each intervention study and identifying specific behavioral interventions that have demonstrated the best scientific evidence of efficacy (best-evidence interventions) in reducing HIV-related risk behaviors, sexually transmitted disease (STD), or HIV incidence.
Search Strategy The PRS Team developed a cumulative database of HIV/AIDS and STD behavioral prevention research literature through a comprehensive systematic search strategy, including automated and manual search components. The automated search is conducted annually in 4 electronic databases (EMBASE, MEDLINE, PsycINFO, and SocioFile, including AIDSLINE before December 2000) and was most recently conducted for our review in November 2004.3235 Manual searches were conducted biannually to identify articles not yet indexed, with the most recent search for our review occurring in January 2005. Members of the PRS Team screened all issues published within the most recent 6 months of 32 prespecified journals to locate relevant reports. The PRS Team also examined the reference lists, screened HIV/AIDS e-mail discussion lists, and reviewed unpublished manuscripts submitted to the team by study authors.
Eligibility of Citations Our review focused only on behavioral interventions delivered to the individual or small group. Interventions delivered to the entire community, or a segment of a community, are typically evaluated using serial cross-sectional samples (unlinked over time). Because many of the criteria used in our review to determine best evidence of efficacy are not applicable to this type of evaluation design, interventions delivered to the community were excluded (n = 10) and will be evaluated in a separate review. For our review, particular attention was given to behavioral interventions or prevention activities supported by CDC HIV-prevention funds for which national guidelines or recommendations do not already exist. Because substance-abuse treatment and needle-exchange programs are not supported by CDC HIV-prevention funds and our review was to help CDCs HIV-prevention partners, those programs were not included. These strategies were shown to be effective in previous reviews and, thus, should be considered in comprehensive prevention programs.36,37 Interventions that strictly address HIV testing or partner counseling and referral services were not included because the CDC already requires all grantees to conduct these programs on the basis of existing CDC guidelines.3840 Interventions explicitly targeting school-based youths were not included in our review because the CDCs Division of Adolescent and School Health focuses on evidence-based recommendations for school-based HIV-prevention programs.4143 In addition, policy interventions (e.g., changing pharmacy or HIV name reporting laws) were not considered because they are not readily implemented by health departments, community-based organizations, or other prevention providers.
Efficacy Criteria for Best Evidence First, a clear description of the intervention was required in order to understand what was being tested. A member of the PRS Team contacted the first author to request formal documentation (e.g., intervention manuals) that would provide more details than a publication. The criteria for quality of study design included a prospective design, an appropriate and concurrent comparison arm, and assignment to study arms either by randomization or a method with minimal bias. For quality of study implementation, the criteria included assessing the outcome(s) at least 3 months after the intervention while retaining at least 70% of enrolled participants in each arm. The criteria for quality of analysis included the performance of appropriate cluster-level analyses when assignment was done at the cluster level, the analysis of participants in study arms as originally assigned, and the analysis of participants regardless of intervention exposure.
To meet the strength of evidence criteria, a study must have demonstrated significant positive evidence and no significant negative evidence for the intervention in reducing HIV risk. The statistically significant (P
Qualitative Data Coding
By the end of January 2005, the comprehensive search strategy identified 100 unique studies that were eligible for this efficacy review (Figure 1
Population Characteristics Among the target groups (Table 1 Thirteen of the 18 best-evidence interventions had study samples consisting of greater than 50% minority participants (range, 58%100%). Four of these included only African Americans48,6771,75,76; 1 included only Hispanics63; and 1 included only African Americans and Hispanics.65,66 The 5 interventions comprised mostly of White participants had study samples with sizeable proportions of minority participants (range, 26% to 49%). Overall, 8 interventions focused exclusively on women or adolescent females,46,48,5052,59,6572 and another intervention targeted women in relationships while including their male partners in the study sample (i.e., 50% women).5355 Of the 9 interventions for women, 8 included mostly minority women (range, 58%100%).48,5055,59,6572 All 5 interventions that targeted drug users included mostly minority participants (range, 77%100%), with 2 interventions focusing exclusively on African American women6771 and 1 focusing exclusively on Hispanic drug injectors.63 Of the 3 interventions targeting high-risk youths,48,64,75,76 2 targeted African American youths.48,75,76 Of the 4 interventions that targeted persons living with HIV, 1 focused on sexually active women, 2 focused on both males and females and also included large proportions of gay or bisexual men, and 1 targeted MSM.60,61,64,7274 All 4 of these interventions for persons living with HIV included large proportions of minorities (range, 49%85%). All interventions were evaluated in urban geographical areas, except 1 intervention for drug users was implemented among residents of a semirural community in Puerto Rico.63 Most of the interventions were evaluated among participants with relatively low socioeconomic status. Nine of the 10 reporting unemployment status consisted of mostly unemployed participants.46,47,5355,59,62,6774 An additional 4 studies provided information regarding income or public housing that indicated participants were of low socioeconomic status.5052,60,61,65,66,75,76
Intervention Characteristics
The duration of the interventions varied, with 2 delivered in 1 to 3 sessions, 8 delivered in 4 to 6 sessions, and 8 delivered in more than 6 sessions (Table 2 Although the content of these interventions differed, most interventions included skill building: technical (e.g., condom use), personal (e.g., relaxation), or interpersonal (e.g., communication). Live demonstrations or the opportunity to practice the application of male condoms was provided in 14 interventions; 4 of these included female condoms as well. Ten interventions included personal skills building components for decisionmaking or problem solving. Six interventions, 3 of which targeted persons who are HIV-positive, included components for stress reduction, stress management, or relaxation. Communication skills, such as negotiation or assertiveness for safer sex, were demonstrated, practiced, or role-played in 13 interventions. In addition, 16 interventions involved the development of plans or setting goals for risk reduction, and 9 addressed the identification and management of triggers for risky sex. Five interventions explicitly encouraged social or group support for participants. Finally, the 2 interventions that targeted African American youths included a sexual abstinence component within the broader framework of a more comprehensive risk-reduction message.48,75,76
Effects of the Interventions Significant intervention effects on behaviors were identified over a range of follow-up times, from 3 to 12 months after the intervention. Four interventions were identified as having produced a significant reduction in new STDs over a minimum of 12 months after exposure to the intervention. The intervention that measured HIV incidence did not significantly reduce the number of new infections.5658
Our review identified 18 behavioral interventions, reported from 2000 through 2004, with the best evidence of efficacy in reducing HIV risk. Most importantly, many of these newly identified efficacious interventions targeted populations disproportionately affected by the HIV/AIDS epidemic and in need of effective prevention tools. There are 6 newly identified best-evidence interventions that are directly applicable for African American or Hispanic heterosexual women at risk for HIV infection5055,59,6571 and 2 directly applicable for African American youths at high risk.48,75,76 Three best-evidence interventions are appropriate for minority injection drug users62,63,6770; 1 directly applicable for injection drugusing women.6770 In alignment with 1 of the key strategies of the CDCs Advancing HIV Prevention Initiative,77 4 best-evidence interventions for persons living with HIV were identified.60,61,64,7274 This set of best-evidence interventions can serve as an important resource for the development of HIV-prevention strategic plans at the national, state, and local levels. Providers of HIV prevention can use the findings of our review to select evidence-based intervention(s) best suited for their communitys needs. To remain a valuable resource to all HIV-prevention providers, our review must be updated frequently to incorporate new scientific evidence. The PRS Team continually updates its database system and plans to report on the updated efficacy findings annually.
Research Gaps Future research should also focus on broadening the applicability of already proven interventions through assessing their generalizability, studying their effectiveness, and adapting them when necessary. Within our review, the interventions were identified as efficacious after being evaluated with a particular target population, in a particular setting, and often within a single site. It is unclear whether these findings would extend beyond the particular target population or setting used in the original research. Additional research should be conducted to determine whether these efficacious interventions work among other high-risk groups or in settings not represented in the original study. Related to generalizability is the issue of effectiveness. These interventions were evaluated in relatively rigorous and controlled research environments, which typically do not reflect real-world circumstances. An efficacious intervention does not necessarily translate into an effective real-world program; it also depends on other factors such as the quality of program implementation, availability, and acceptance.9396 The extent to which these proven interventions will work once translated into practice has yet to be systematically evaluated. In addition, interventions often need to be adapted to address different social, cultural, or contextual factors of various settings and populations as a way to fulfill unmet prevention needs until additional evidence is available. Although the adaptation of a proven intervention may have a better chance of being effective than the implementation of a newly developed and untested intervention, rigorous effectiveness studies would help evaluate this. Thus, targeted research is needed to determine ways to improve an interventions effectiveness in real-world settings, particularly when it has been adapted.
Implications for Prevention
Limitations Our review did not attempt to rank the interventions or their evaluations, which clearly vary in terms of the type and complexity of intervention, study quality, and magnitude, significance, and consistency of findings. Some interventions, for example, led to long-term reductions in several risk behaviors, whereas others produced short-term reductions that were not maintained over time. All of these best-evidence interventions met the minimal PRS criteria for scientific evidence of efficacy; however, some may be more appropriate, feasible, effective, or sustainable in real-world settings than others. In addition, our review did not assess cost-effectiveness. Future studies on the cost-effectiveness and potential cost-saving of each of these interventions would contribute to the understanding of their potential public health impact. Consideration of these more practical aspects would help to prioritize which interventions should be translated into practice. Finally, our review relied on the information reported in peer-reviewed scientific publications. The information necessary for making our determination of best evidence was often unclear, not reported, or not available from the first author. We encourage authors to follow the Consolidated Standards of Reporting Trials110,111 and Transparent Reporting of Evaluations With Nonrandomized Designs112 statements when reporting on their intervention evaluations. This would not only improve the data reporting quality of evaluations but would also improve the quality of systematic reviews including the evaluations. In addition, we were unable to link primary outcome hypotheses to the reported findings, often because of the lack of clarity in reporting study hypotheses. This information could help prioritize the relevance and importance of each intervention. Perhaps the recent efforts in promoting the public registration of all clinical trials will help to resolve this over time.113,114
Conclusions
The authors thank all principal investigators of the original research who facilitated our review process by providing the necessary additional information or analyses as requested by the PRS staff. The authors also thank the reviewers for their insightful comments on the earlier draft.
Human Participant Protection
Peer Reviewed Note. The findings and conclusions in this report are those of the authors and do not necessarily represent the views of the Centers for Disease Control and Prevention.
Contributors Accepted for publication February 15, 2006.
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