Measuring outcomes of behavioural interventions for STD/HIV prevention

Revealing a safer sex option to reduce HIV risk: a cluster-randomized trial in Botswana

BACKGROUND

1.8 million new HIV infections occur every year, disproportionately affecting adolescent girls and young women. Abstinence-only risk avoidance approaches have had limited impact on reducing new infections. This cluster-randomized trial examines a risk reduction approach to curbing risky sex for school-going girls in Botswana.

METHODS

The unit of randomization was the school (n = 229). Intervention participants received a 1-h intervention revealing a safer sex option: dating same-age partners which have 5-9x lower HIV prevalence than older partners. Primary outcomes were pregnancy as a proxy for unprotected sex and HIV. Secondary outcomes included self-reported sexual behavior. Generalized linear multilevel models with school-level robust variance for adjusted relative risk ratios were used in an intention-to-treat analysis.

RESULTS

At a 12-month follow up, the intervention reduced pregnancy with an adjusted Relative Risk Ratio (aRRR) of .657 [95% CI .433-.997] significant at the 5% level. Effects were largest at junior school (aRRR = .575 [95% CI .394-.841]) and in rural areas (aRRR = .518 [95% CI .323-.831]), significant at the 1% level. There were no significant effects for primary school students, suggesting age of sexual debut and related mechanisms are critical factors in the intervention's effectiveness. Moreover, baseline beliefs of which partner is riskiest mediate the magnitude of effects.

CONCLUSIONS

Information on safe sex options can change sexual behavior. The success of the intervention working across contexts will depend on various factors, such as age of sexual debut and baseline beliefs.

TRIAL REGISTRATION

Pan African Clinical Trials Registry PACTR201901837047199 . Registered 31 December 2018. Retrospectively registered. This study adheres to CONSORT guidelines.

Sexualized drug use ('chemsex') and high-risk sexual behaviours in HIV-positive men who have sex with men

Objectives

The incidence of sexually transmitted infections (STIs) and HIV infection remains high in gay, bisexual, and other men who have sex with men (MSM) in the UK, and sexualized drug use (“chemsex”) and injecting drug use (“slamsex”) may play a part in this. We aimed to characterize HIV‐positive MSM engaging in chemsex/slamsex and to assess the associations with self‐reported STI diagnoses and sexual behaviours.

Methods

Data from a 2014 survey of people attending HIV clinics in England and Wales were linked to clinical data from national HIV surveillance records and weighted to be nationally representative. Multivariable logistic regression assessed the associations of chemsex and slamsex with self‐reported unprotected anal intercourse (UAI), serodiscordant UAI (sdUAI) (i.e. UAI with an HIV‐negative or unknown HIV status partner), sdUAI with a detectable viral load (>50 HIV‐1 RNA copies/mL), hepatitis C, and bacterial STIs.

Results

In the previous year, 29.5% of 392 sexually active participants engaged in chemsex, and 10.1% in slamsex. Chemsex was significantly associated with increased odds of UAI [adjusted odds ratio (AOR) 5.73; P < 0.001], sdUAI (AOR 2.34; P < 0.05), sdUAI with a detectable viral load (AOR 3.86; P < 0.01), hepatitis C (AOR 6.58; P < 0.01), and bacterial STI diagnosis (AOR 2.65; P < 0.01). Slamsex was associated with increased odds of UAI (AOR 6.11; P < 0.05), hepatitis C (AOR 9.39; P < 0.001), and bacterial STI diagnosis (AOR 6.11; P < 0.001).

Conclusions

Three in ten sexually active HIV‐positive MSM engaged in chemsex in the past year, which was positively associated with self‐reported depression/anxiety, smoking, nonsexual drug use, risky sexual behaviours, STIs, and hepatitis C. Chemsex may therefore play a role in the ongoing HIV and STI epidemics in the UK.

Beyond the Primary Endpoint Paradigm: A Test of Intervention Effect in HIV Behavioral Intervention Trials with Numerous Correlated Outcomes

Behavioral interventions are increasingly based on holistic approaches to health with an understanding that health-related behaviors are linked. A motivating example is provided by the Philani study, an intervention trial conducted to improve the health of South African mothers and their children. Inter-related health problems around maternal alcohol use, malnutrition, and HIV were addressed; multiple endpoints were targeted. The traditional hypothesis testing paradigm that tests significance on one primary outcome did not suffice. Past multiple endpoint studies have utilized a sign test on the number of estimated differences between treatment and control that favor the intervention. However, in order to preserve type 1 error, one must account for correlations among the outcomes. We propose an alternative approach that counts the number of significant treatment-control differences. Monte Carlo simulation is used to adjust for correlation, providing updated critical values and p values. Our method is implemented through an R package and applied to the Philani data to test the intervention's overall effect.

Reliability, Validity, and Associations with Sexual Behavior among Ghanaian Teenagers of Scales Measuring Four Dimensions Relationships with Parents and Other Adults

Little research has been done on the social contexts of adolescent sexual behaviors in sub-Saharan Africa. As part of a longitudinal cohort study (N=1275) of teenage girls and boys in two Ghanaian towns, interviewers administered a 26 item questionnaire module intended to assess four dimensions of youth-adult relationships: monitoring conflict, emotional support, and financial support. Confirmatory factor and traditional psychometric analyses showed the four scales to be reliable. Known-groups comparisons provided evidence of their validity. All four scales had strong bivariate associations with self-reported sexual behavior (odds ratios = 1.66, 0.74, 0.47, and 0.60 for conflict, support, monitoring, and financial support). The instrument is practical for use in sub-Saharan African settings and produces measures that are reliable, valid, and predictive of sexual behavior in youth.

Risk for coerced sex among female youth in Ghana: roles of family context, school enrollment and relationship experience

CONTEXT

A better understanding is needed of the variables that may influence the risk of experiencing coerced sex among adolescent females in Sub-Saharan Africa.

METHODS

Data were collected from 700 female respondents who were interviewed in 2010 and 2012 waves of a longitudinal study of behavioral risk for HIV infection among youth aged 13-14 or 18-19 and living in two towns in southeastern Ghana. A series of logistic regression models examined the influences of household composition and wealth, four family process variables (behavioral control, relationship quality, financial support, conflict), school enrollment and relationship experience on females' risk of experiencing coerced sex.

RESULTS

Eighteen percent of respondents reported having experienced coerced sex prior to Wave 1, and 13% experienced it between Waves 1 and 2. In both cross-sectional and prospective models, the variable with the strongest association with having experienced coerced sex was having ever had a boyfriend (fully adjusted odds ratios, 4.5 and 2.6, respectively). In cross-sectional analyses, parental behavioral control was negatively associated with risk for coerced sex, while parental conflict was positively associated; these associations were not significant in the prospective analyses. Having a boyfriend appears to be the primary predictor of coerced sex among young females, beyond any influence of family, school or other household variables.

CONCLUSIONS

More research is needed to understand the context of females' relationships with boyfriends in an effort to reduce the risk of sexual coercion and to promote the prevention of sexual violence perpetrated by males within these relationships.

Examining the components of population-level sexual behavior trends from 1993 to 2007 in an open ugandan cohort

INTRODUCTION

Sexual behavior changes are widely cited as contributing factors to sexually transmitted disease trends. We explore a rarely examined aspect of behavior trends in an open cohort--the relative impact of individuals' changing reported behavior versus new responses due to a changing respondent base.

METHODS

Respondents from an open cohort in Uganda annually answer questions on sexual behavior. We describe the impacts on behavior trends of: respondents' changing reported behavior, migration, mortality, changing eligibility for indicator inclusion, changing survey participation, and misreporting. We report contributions to trends on the following factors: condom use, ever had sex, age at first sex, and number of sexual partners and casual partners.

RESULTS

Main trend contributions varied by indicator. Condom use trends were influenced by individuals' changing responses and by increasing condom use among in-migrants and newly interviewed people. Sexual partners were driven by fewer partners among newly interviewed people, although increase of partners in 1999, 2004, and 2006 stemmed mainly from people changing answers. Thirty-nine percent of responses to age at first sex among 17- to 20-year-olds were inconsistent--different ages in different years. Early trends in the factor "ever had sex" among 15- to 19-year-olds were driven by people changing their answers--including ever to never, an impossible sequence. Comparing behavior in one year to mortality in the next, we found little evidence of higher mortality among higher risk takers.

DISCUSSION

In an open cohort, various factors contribute to sexual behavior trends. When reporting sexual behavior trends, researchers should acknowledge the contributing factors and attempt to separate the role of interindividual versus intraindividual changes.

Men's multiple sexual partnerships in 15 Sub-Saharan African countries: sociodemographic patterns and implications

Men's multiple sexual partnerships contribute to the spread of HIV in sub-Saharan Africa, but the social determinants of these relationships remain poorly understood. Prevailing wisdom suggests that men's institutionalized authority over women and their control of economic resources are key facilitators of multiple partnerships in this region. Men's exposure to or freedom from social control mechanisms embedded in family and village life may also play a role. This article provides insight into these issues by examining sociodemographic correlates of men's multiple sexual partnerships using data from recent Demographic and Health Surveys in 15 sub-Saharan African countries. The prevalence of self-reported multiple partnerships varies widely among countries. Sociodemographic patterns of such partnerships confirm the importance of men's control of economic resources and suggest that men's freedom from social control mechanisms may be more important than their authority over their wives.

Outcomes and lessons from a pilot RCT of a community-based HIV prevention multi-session group intervention for gay men

This paper presents the first outcome evaluation of multi-session groupwork for HIV prevention among gay men in the UK. This community-based RCT recruited 50 men, of whom 42% were HIV-positive or untested, and 32% reported status unknown or serodiscordant UAI in the previous 12 months. No knowledge, skills, attitudinal or behavioural differences were detected between intervention and control at baseline. At eight weeks, those attending the group reported significant gains over their control in making sexual choices, physical safety, HIV and STI transmission knowledge, and sexual negotiation skills. At 20 weeks, significant differences remained for HIV and STI transmission knowledge and comfort with sexual choices. Although no behavioural differences were detected, the aims of the National Prevention Strategy were met. This pilot RCT is appraised in the light of modest sample size and attrition, and recommendations for establishing behavioural outcomes are presented. This study has demonstrated that high-risk community samples can be recruited to multi-session interventions, and has provided feasibility data for future rigorous evaluation designs.

A systematic review and meta-analysis of quantitative interviewing tools to investigate self-reported HIV and STI associated behaviours in low- and middle-income countries

OBJECTIVE

Studies identifying risks and evaluating interventions for human immunodeficiency virus (HIV) and other sexually transmitted infections often rely on self-reported measures of sensitive behaviours. Such self-reports can be subject to social desirability bias. Concerns over the accuracy of these measures have prompted efforts to improve the level of privacy and anonymity of the interview setting. This study aims to determine whether such novel tools minimize misreporting of sensitive information.

METHODS

Systematic review and meta-analysis of studies in low- and middle-income countries comparing traditional face-to-face interview (FTFI) with innovative tools for reporting HIV risk behaviour. Crude odds ratios (ORs) and 95% confidence intervals (CIs) were calculated. Cochran's chi-squared test of heterogeneity was performed to explore differences between estimates. Pooled estimates were determined by gender, region, education, setting and question time frame using a random effects model.

RESULTS

We found and included 15 data sets in the meta-analysis. Most studies compared audio computer-assisted self interview (ACASI) with FTFI. There was significant heterogeneity across studies for three outcomes of interest: 'ever had sex' (I(2) = 93.4%, P < 0.001), non-condom use (I(2) = 89.3%, P < 0.001), and number of partners (I(2) = 75.3%, P < 0.001). For the fourth outcome, 'forced sex', there was homogenous increased reporting by non-FTFI methods (OR 1.47; 95% CI 1.11-1.94). Overall, non-FTFI methods were not consistently associated with a significant increase in the reporting of all outcomes. However, there was increased reporting associated with non-FTFI with region (Asia), setting (urban), education (>60% had secondary education) and a shorter question time frame.

CONCLUSION

Contrary to expectation, differences between FTFI and non-interviewer-administered interview methods for the reported sensitive behaviour investigated were not uniform. However, we observed trends and variations in the level of reporting according to the outcome, study and population characteristics. FTFI may not always be inferior to innovative interview tools depending on the sensitivity of the question as well as the population assessed.

Behavioral mechanisms in HIV epidemiology and prevention: past, present, and future roles

In the 1980s, behavioral variations across geographically and socially defined populations were the central focus of AIDS research, and behavior change was seen as the primary means of controlling HIV epidemics. Today, biological mechanisms--especially other sexually transmitted infections, antiretroviral therapy, and male circumcision--predominate in HIV epidemiology and prevention. We describe several reasons for this shift in emphasis. Although the shift is understandable, we argue for a sustained focus on behavioral mechanisms in HIV research in order to realize the theoretical promise of interventions targeting the biological aspects of HIV risk. We also provide evidence to suggest that large reductions in HIV prevalence may be accomplished by small changes in behavior. Moreover, we contend that behavioral mechanisms will find their proper place in HIV epidemiology and prevention only when investigators adopt a conceptual model that treats prevalence as a determinant as well as an outcome of behavior and that explicitly recognizes the dynamic interdependence between behavior and other epidemiological and demographic parameters.

The prevalence of other sexually transmitted infections in confirmed HIV cases at a referral clinic in Jamaica

Jamaica has the second highest number of acquired immunodeficiency syndrome (AIDS) cases and deaths in the Caribbean and a significant number of human immunodeficiency virus (HIV) infected individuals have a concomitant sexually transmitted infection (STI). The study determined the prevalence of non-ulcerative and ulcerative STIs and their association with sexual risky behaviour in a sample of HIV seropositive men and women. This study was conducted at the Comprehensive Health Centre in Jamaica, a sexually transmitted infection referral centre. The sample comprised 138 men and 132 women age 15—49 years, of average 29.5 years. The study was retrospective, from 2000 to 2002, and sample collection was randomized. The sexual behaviours of the subjects were assessed from the case records. In the 270 HIV diagnosed cases examined, the prevalence of STIs was 51.1% in men and 48.9% in women, with 85.4% having one or more STIs with an average of four STIs per patient. There was a total occurrence of 744 STIs with non-gonococcal urethritis (19.4%), gonorrhoea (17.2%), candidiasis (13.4%), trichomonas (12.4%), genital ulcer (10.4%) and syphilis (7.3%) the most common in HIV infected men and women. The presence of STI was associated with continued practice of risky sexual behaviour. The age group most implicated was the 30—34 year old, and 73.1% of the HIV infected patients had multiple sexual partners with only 16.4% reporting frequent condom use. The study demonstrates that there is a high prevalence of non-ulcerative and to a lesser extent ulcerative STIs in HIV infected patients in Jamaica. There are significant associations between STIs and continued high risk sexual practices in HIV infected men and women. The findings support the need for implementation of effective diagnosis and treatment strategies coupled with education about safe-sex practices in HIV prevention and STI control programmes.

Impact of five years of peer-mediated interventions on sexual behavior and sexually transmitted infections among female sex workers in Mombasa, Kenya

BACKGROUND

Since 2000, peer-mediated interventions among female sex workers (FSW) in Mombasa Kenya have promoted behavioural change through improving knowledge, attitudes and awareness of HIV serostatus, and aimed to prevent HIV and other sexually transmitted infection (STI) by facilitating early STI treatment. Impact of these interventions was evaluated among those who attended peer education and at the FSW population level.

METHODS

A pre-intervention survey in 2000, recruited 503 FSW using snowball sampling. Thereafter, peer educators provided STI/HIV education, condoms, and facilitated HIV testing, treatment and care services. In 2005, data were collected using identical survey methods, allowing comparison with historical controls, and between FSW who had or had not received peer interventions.

RESULTS

Over five years, sex work became predominately a full-time activity, with increased mean sexual partners (2.8 versus 4.9/week; P < 0.001). Consistent condom use with clients increased from 28.8% (145/503) to 70.4% (356/506; P < 0.001) as well as the likelihood of refusing clients who were unwilling to use condoms (OR = 4.9, 95%CI = 3.7-6.6). In 2005, FSW who received peer interventions (28.7%, 145/506), had more consistent condom use with clients compared with unexposed FSW (86.2% versus 64.0%; AOR = 3.6, 95%CI = 2.1-6.1). These differences were larger among FSW with greater peer-intervention exposure. HIV prevalence was 25% (17/69) in FSW attending > or = 4 peer-education sessions, compared with 34% (25/73) in those attending 1-3 sessions (P = 0.21). Overall HIV prevalence was 30.6 (151/493) in 2000 and 33.3% (166/498) in 2005 (P = 0.36).

CONCLUSION

Peer-mediated interventions were associated with an increase in protected sex. Though peer-mediated interventions remain important, higher coverage is needed and more efficacious interventions to reduce overall vulnerability and risk.

HIV/AIDS epidemiology, pathogenesis, prevention, and treatment

The HIV-1 pandemic is a complex mix of diverse epidemics within and between countries and regions of the world, and is undoubtedly the defining public-health crisis of our time. Research has deepened our understanding of how the virus replicates, manipulates, and hides in an infected person. Although our understanding of pathogenesis and transmission dynamics has become more nuanced and prevention options have expanded, a cure or protective vaccine remains elusive. Antiretroviral treatment has transformed AIDS from an inevitably fatal condition to a chronic, manageable disease in some settings. This transformation has yet to be realised in those parts of the world that continue to bear a disproportionate burden of new HIV-1 infections and are most affected by increasing morbidity and mortality. This Seminar provides an update on epidemiology, pathogenesis, treatment, and prevention interventions pertinent to HIV-1.

Condom use and risk of gonorrhea and Chlamydia: a systematic review of design and measurement factors assessed in epidemiologic studies

BACKGROUND

Studies of condom use to reduce risk of most sexually transmitted infection provide inconsistent results. This inconsistency is often attributed to methodologic limitations yet has not been assessed systematically.

OBJECTIVES

The objectives of this study were to review studies of condom use and risk of gonorrhea and chlamydia, and to evaluate the importance of 4 key design and measurement factors on condom effectiveness estimates.

DESIGN

We reviewed studies published 1966-2004 to assess risk reduction for gonorrhea and/or chlamydia associated with male condom use.

RESULTS

Of 45 studies identified, most found reduced risk of infection associated with condom use. All studies reviewed had methodologic limitations: only 28 (62%) distinguished consistent from inconsistent use; 2 (4%) reported on correct use or use problems; 13 (29%) distinguished incident from prevalent infection; and one (2%) included a population with documented exposure to infection. Eight of 10 studies with 2 or more of these attributes reported statistically significant protective effects for condom use versus 15 of 35 studies with zero or one attribute (80% vs. 43%, P = 0.04).

CONCLUSIONS

Condom use was associated with reduced risk of gonorrhea and chlamydia in men and women in most studies, despite methodologic limitations that likely underestimate condom effectiveness. Epidemiologic studies that better address these factors are needed to provide more accurate assessment of condom effectiveness.

Perceptions of risk and strategies for prevention: responses to HIV/AIDS in rural Malawi

This paper combines quantitative and qualitative data to investigate changes in perceived risk of contracting HIV/AIDS in rural Malawi. Using longitudinal survey data, we find that Malawians worried less about contracting HIV/AIDS in 2001 than in 1998. According to qualitative interviews and observational journal accounts, HIV/AIDS and strategies to prevent it are a frequent topic of conversation amongst married Malawians. Women report worrying most about their husbands as a possible source of infection, discussing with them the importance of avoiding infection, and, increasingly, using divorce to reduce their risk. Men report worrying most about their extramarital partners and adopting preventive strategies such as fewer partners and more careful partner selection. We show that the decline in perceived risk is significantly associated with declines in the behaviors that Malawians worry most about and perceptions of risk in individuals' social networks. We interpret these findings as evidence that Malawians are changing their behavior in ways that may reduce the spread of HIV/AIDS.

Relative Efficacy of Prevention Counseling With Rapid and Standard HIV Testing: A Randomized, Controlled Trial (RESPECT-2)

BACKGROUND

Two risk-reduction counseling sessions can prevent sexually transmitted diseases (STDs); however, return rates for test results are low.

STUDY

A randomized, controlled trial compared rapid HIV testing and counseling in 1 visit with standard HIV testing and counseling in 2 visits. Main outcomes were STDs (gonorrhea, chlamydia, trichomoniasis, syphilis, HIV) within 12 months. Participants were 15- to 39-year-old STD clinic patients in Denver, Long Beach, and Newark. STD screening and questionnaires were administered every 3 months.

RESULTS

Counseling was completed by 1632 of 1648 (99.0%) of the rapid-test group and 1144 of 1649 (69.4%) of the standard-test group. By 12 months, STD was acquired by 19.1% of the rapid group and 17.1% of the standard group (relative risk [RR], 1.11; confidence interval [CI], 0.96-1.29). STD incidence was higher in the rapid-test group than in the standard-test group among men (RR, 1.34; CI, 1.06-1.70), men who had sex with men (RR, 1.86; 95% CI, 0.92-3.76), and persons with no STDs at enrollment (RR, 1.21; 95% CI, 0.99-1.48). Behavior was similar in both groups.

CONCLUSIONS

Counseling with either test had similar effects on STD incidence. For some persons, counseling with standard testing may be more effective than counseling with rapid testing.

Informal confidential voting interview methods and temporal changes in reported sexual risk behaviour for HIV transmission in sub-Saharan Africa

OBJECTIVES

Reliable data on sexual behaviour trends are needed to evaluate HIV interventions in sub-Saharan Africa but are difficult to obtain due inter alia to social desirability bias. The objective of this paper is to assess whether the use of informal confidential voting interviews (ICVI) was associated with greater reporting of socially proscribed behavioural risk factors for HIV infection than were conventional interviewing methods.

METHODS

Comparison of changes in reports of risk behaviours for HIV infection in ICVI versus face to face interviews (FTFIs) between the first two rounds of a large scale, longitudinal, population based survey in Manicaland, Zimbabwe. Examination of factors that could contribute to observed changes in the effect of ICVI, including temporal changes in response error and social desirability, and factors affecting statistical power to detect differences between methods-that is, reductions in the prevalence of risk behaviours and sample size.

RESULTS

Enhanced reporting of HIV associated risk behaviours in ICVI interviews was not so apparent in the second round as in the first round of the survey, particularly for less frequently reported behaviours. Levels of reported HIV associated risk behaviour and sample sizes both declined between the two survey rounds. The level of response error was higher in ICVI interviews than in FTFI interviews but did not alter over time.

CONCLUSION

ICVI interviews can reduce social desirability bias in data on HIV associated risk behaviours. The extent and direction of change in net reduction in bias over time remains uncertain and will depend on local circumstances.

Community group participation:

The lifetime risk of acquiring HIV infection in many rural as well as urban areas of southern Africa is currently as high as two-in-three. For women, much of this risk still accrues rapidly at young ages despite high levels of knowledge about HIV/AIDS. Thus, programmes that are more participatory and address underlying structural and community-level factors appear to be essential. We use cross-sectional data from a large-scale, population-based survey in rural eastern Zimbabwe to describe the relationships between membership of different forms of community group and young women's chances of avoiding HIV. Our results show that participation in local community groups is often positively associated with successful avoidance of HIV, which, in turn, is positively associated with psychosocial determinants of safer behaviour. However, whether or not these relationships hold depends on a range of factors that include how well the group functions, the purpose of the group, and the education level of the individual participant. We identify factors that may influence the social capital value of community groups in relation to HIV prevention at the individual, group, and community levels. Young women with secondary education participate disproportionately in well-functioning community groups and are more likely to avoid HIV when they do participate. Longitudinal studies are needed: (i) to establish whether community group membership supports the development of safer lifestyles or merely has greater appeal to individuals already predisposed towards such lifestyles, and (ii) to pinpoint directions of causality between hypothesised mediating factors. In-depth research is needed on the specific qualities of community groups that enhance their contribution to HIV control. However, our findings suggest that promotion of and organisational development and training among community groups could well be an effective HIV control strategy.

The sexual health of pupils in years 4 to 6 of primary schools in rural Tanzania

BACKGROUND/OBJECTIVES

There is an urgent need for effective interventions to improve the sexual and reproductive health of adolescents. Reliable data on the sexual health of adolescents are needed to guide the development of such interventions. The aim was to describe the sexual health of pupils in years 4 to 6 of 121 rural primary schools in north western Tanzania, before the implementation of an innovative sexual health intervention in 58 of the schools.

METHODS

A cross sectional survey of primary school pupils in rural Tanzania was carried out. The study population comprised pupils registered in years 4 to 6 of 121 primary schools in 20 rural communities in 1998. Basic demographic information was collected from all pupils seen. Those born before 1 January 1985 (aged approximately 14 years and over) were invited to participate in the survey, and asked about their knowledge and attitudes towards sexual health issues, and their sexual experience. A urine specimen was requested and tested for HIV, Chlamydia trachomatis (CT), Neisseria gonorrhoeae (NG) and, for females, pregnancy.

RESULTS

9283 pupils born before 1 January 1985 were enrolled and provided demographic information and a urine sample. Male pupils were significantly older than females (mean age 15.5 years v 14.8 years, p<0.001), but all other demographic characteristics were similar between the sexes. 14 (0.2%) of the enrolled pupils (four male and 10 female) were HIV positive, 83 (0.9%) were positive for CT, and 12 (0.1%) for NG. 32 female pupils (0.8%) were positive by pregnancy test. Sexual experience was reported by one fifth of primary school girls, and by almost half of boys. Only 45/114 (39%) girls with biological markers of sexual activity reported having had sex.

CONCLUSIONS

HIV, CT, NG, and pregnancy were present though at relatively low levels among pupils in years 4 to 6 of primary school. A high proportion of pupils with a biological marker of sexual activity denied ever having had sex. Alternative ways of collecting sensitive data about the sexual behaviour of school pupils should be explored.

HIV prevention among drug users: outcome of a network-oriented peer outreach intervention

A network-oriented HIV prevention intervention based on social identity theory and peer outreach was implemented for HIV positive and negative drug users. A community sample of 250 were randomly assigned to an equal-attention control condition or a multisession, small-group experimental condition, which encouraged peer outreach; 94% of participants were African American, and 66% used cocaine or opiates. At follow-up, 92% of participants returned, and experimental compared with control group participants were 3 times more likely to report reduction of injection risk behaviors and 4 times more likely to report increased condom use with casual sex partners. Results suggest that psychosocial intervention emphasizing prosocial roles and social identity, and incorporating peer outreach strategies, can reduce HIV risk in low-income, drug-using communities.

Prisoner risk taking in the Russian Federation

For a pilot prevention program in Russian prisons, Médecins Sans Frontières conducted research on prisoner risk behaviors with full support from Russian prison authorities. Analysis of data from 1,044 15-30-year-old prisoners produced evidence of HIV/AIDS risks in prisons. One percent of prisoners surveyed reported all three prison risk activities--engaging in sex, injecting drugs, and getting a tattoo. Two-by-two table analysis consistently showed statistically significant associations between risk activities. These results conservatively describe the presence and nature of such risks: Risks do occur, risks vary and the relationships between risks vary, and Russian prisoners already take steps to reduce risk. This evidence helps to justify and informs HIV/AIDS prevention and health promotion interventions in the Russian prison system.

Methods to reduce social desirability bias in sex surveys in low-development settings: experience in Zimbabwe

BACKGROUND

Social desirability bias hampers measurement of risk behavior for acquiring STDs and evaluation of control interventions. More confidential data collection methods reduce this bias in Western countries but generally require technology not available in less developed settings. GOAL The goal of this report was to describe and evaluate an informal, confidential, low-technology method-Informal Confidential Voting Interviews (ICVIs)-for collecting sexual behavior data in less developed settings.

STUDY DESIGN

Reports of multiple sex partners by sexually active, basic-literate, population-based survey participants in rural Zimbabwe randomly assigned to ICVIs and face-to-face interviews (FTFIs) were compared.

RESULTS

Ninety-two percent of respondents (n = 7,823) were sufficiently literate for ICVIs. Error rates were low but higher than in FTFIs. More male and female ICVI respondents interviewed reported multiple current sex partners (OR = 1.33 and 5.24, respectively) and multiple partners in the past month (OR = 1.71 and 2.92) and the past year (OR = 1.35 and 1.97).

CONCLUSION

The ICVI method appears to reduce bias but requires further evaluation to assess viability and effect in alternative settings.

Utility of behavioral changes as markers of sexually transmitted disease risk reduction in sexually transmitted disease/HIV prevention trials

Most sexually transmitted disease (STD)/HIV sexual risk reduction intervention trials are evaluated using behavioral outcomes as their main indicators of intervention effectiveness. How good are behavioral measures as surrogate markers for STD infection? Do the behavioral changes that are commonly assessed in risk reduction interventions accurately reflect changes in STD risk? We applied a mathematical model of STD/HIV transmission to empiric data from a large HIV prevention intervention to estimate pre- to postintervention changes in intervention participants' STD risk. We then used the coefficient of determination (R(2)) to assess the strength of association between changes in STD risk and changes in three behavioral measures: proportion of acts of intercourse for which condoms were used, number of sex partners, and number of acts of unprotected intercourse. The results indicate that change in the number of acts of unprotected intercourse is a superior marker of STD risk changes for less infectious STDs such as HIV, whereas change in the number of partners may be preferable for highly infectious STDs such as gonorrhea. Changes in the proportion of acts of intercourse for which condoms were used were not strongly correlated with changes in STD risk under most of the conditions examined in this analysis. The utility of different measures of sexual behavior change as markers for changes in STD risk and, hence, expected incidence, depends on the infectivity and prevalence of the target STD.

Behaviors changed by intervention are associated with reduced STD recurrence: the importance of context in measurement

BACKGROUND

Evaluations of STD/HIV interventions incorporating behavioral and biologic outcomes have not reported strong correspondence.

GOAL

The goal of the study was to demonstrate that behaviors, measured comprehensively, are associated with infection and to delineate the behaviors responsible for reduced infection rates in Project SAFE (Sexual Awareness For Everyone).

STUDY DESIGN

Follow-up data from an intervention trial were analyzed to determine: (1) study versus control differences in complex risk behaviors and (2) the overall relationship between these behaviors and infection status (chlamydia and/or gonorrhea), with use of multiple logistic regression.

RESULTS

Lower infection rates among 249 women who received intervention (compared with 228 controls) were explained by reduced-risk status in 5 modifiable behaviors. The 0 to 12-month logistic regression model (including sex with untreated partner [OR = 5.6], lack of mutual monogamy [OR = 2.4], unsafe sex [OR = 1.9], rapid partner turnover [OR = 2.7], and douching after sex [OR = 1.9]) correctly predicted infection status for 75.3% of participants (71.8% of infected, 76.2% of uninfected). Women in nonmutually monogamous unions who had sex with partners who were untreated or incompletely treated were 13 times more likely to be infected than those who were monogamous and avoided sex with an untreated/incompletely treated partner.

CONCLUSION

This intervention reduced infection rates by maintaining low-risk behaviors and changing high-risk behaviors. We elucidated the complex relationship between behavior and infection by incorporating context into variable conceptualization and considering several behaviors simultaneously.

Sexual mixing patterns and sex-differentials in teenage exposure to HIV infection in rural Zimbabwe

BACKGROUND

HIV-1 prevalence typically rises more rapidly at young ages in women than in men in sub-Saharan Africa. Greater susceptibility to infection on exposure in women is believed to be a contributory factor as is greater exposure to previously infected sexual partners of the opposite sex. We investigated the latter hypothesis using data from a field study in rural Manicaland, Zimbabwe.

METHODS

Quantitative data on onset and degree of sexual activity, numbers of partners, concurrent partnerships, condom use, and partner characteristics were used in conjunction with epidemiological data on age and sex specific prevalence of HIV infection to do statistical analyses of association between key variables. Mathematical models and qualitative data were used to aid analysis and interpretation.

FINDINGS

Older age of sexual partner was associated with increased risk of HIV-1 infection in men (odds ratio 1.13 [95% CI 1.02-1.25]) and women (1.04 [1.01-1.07]). Young women form partnerships with men 5-10 years older than themselves, whereas young men have relationships with women of a similar age or slightly younger. Greater number of lifetime partners is also associated with increased risk of HIV (1.03 [1.00-1.05]). Young men report more partners than do women but infrequent coital acts and greater use of condoms. These behaviour patterns are underpinned by cultural factors including the expectation that women should marry earlier than men. A strong gender effect remains after factors that affect exposure to infected partners are controlled for (6.04 [1.49-24.47]).

INTERPRETATION

The substantial age difference between female and male sexual partners in Manicaland is the major behavioural determinant of the more rapid rise in HIV prevalence in young women than in men. Theoretical studies have suggested that this difference is an important determinant of observed epidemiological patterns but the study reported in this paper provides clear empirical evidence of association.

Using sexually transmitted disease incidence as a surrogate marker for HIV incidence in prevention trials: a modeling study

BACKGROUND

Because many of the sexual behaviors that place individuals at risk of acquiring HIV are the same as those that place them at risk for other sexually transmitted diseases (STDs), researchers and policymakers have called for the use of non-HIV STDs as surrogate markers for HIV infection.

GOALS

This study examined the epidemiologic conditions under which changes in STD incidence are associated with changes in HIV incidence.

STUDY DESIGN

A mathematical model of HIV/STD transmission was applied to empirical data from a large HIV prevention intervention. The association between participants' HIV infection risk reduction scores and their STD risk reduction scores was measured with use of the Pearson product-moment correlation. The authors examined how the strength of association varied across different epidemiologic parameters and heterosexual behaviors.

RESULTS

Moderate to strong associations were noted when the infectivity of the STD was similar to the infectivity of HIV. The association was attenuated for larger STD infectivity values. The prevalence of STD infection was a less important determinant of the strength of association. Stronger associations were obtained when the number of sex partners was large or the number of sex acts was small.

CONCLUSIONS

Easily transmitted STDs, such as gonorrhea, are unsuitable for general use as surrogate markers for HIV infection. Hepatitis B, syphilis, and chlamydial infection have more promising epidemiologic profiles. Careful studies of STD infectivity are needed to aid in the identification of potential marker STDs.

Balancing rigour and acceptability: the use of HIV incidence to evaluate a community-based randomised trial in rural Uganda

Recent debate about the evaluation of community based, HIV/AIDS behavioural interventions has focused on the appropriateness of the randomised controlled trial (RCT) design, and the difficulty of obtaining reliable outcome measures. A community based HIV AIDS behavioural change RCT, recently conducted in rural Uganda, used HIV incidence as the principal outcome measure. This paper examines the acceptability of the trial from the community perspective. It asks whether, in a rural African setting, it is possible to implement a scientifically rigorous evaluation without compromising acceptability of the trial to the community. Opinions of the trial held by community members working as trial field workers were collected by semi-structured interview (n = 37), and focus group discussions (4) Community opinions of the trial were ascertained through 10 focus groups. For both field workers and the community, the sero-survey was more salient than the intervention, and the source of many rumours and disputes. Despite intensive mobilisation and close monitoring of field workers, it was impossible to ensure the veracity of explanations about the survey at ground level, and to protect each individual from coercion. The community expected a reward in return on their blood. Although the introduction of incentives at the final survey round increased the acceptability of the trial, they not only created jealousies and tensions, but also led to expectations of greater rewards in future. We conclude that RCTs in poor, rural communities are feasible, but the challenges involved should not be underestimated. Obtaining community support for the trial, respecting established hierarchies, and close supervision of field workers are all essential, but even then, controversies should be anticipated. There is an urgent need for relevant guidelines to help researchers navigate the complex ethical issues involved.

An investigation of condom use by frequency of sex

OBJECTIVES

To examine the association between condom use and frequency of sex across sexual partner types.

METHODS

Data were collected from African American drug users residing in Washington, DC. Participants were asked to provide the first name of the last three partners with whom they had had vaginal sex, to define the type of relationship, the number of times they had had vaginal sex in the last 30 days with each partner, and whether they had used a condom during their last sexual encounter with each partner. Condom use was examined by frequency of sex in the past 30 days controlling for partner type.

RESULTS

Frequency of sexual encounters varied by partner type. The largest number of sexual encounters was with casual partners, followed by commercial and primary partners, respectively. Within partner types, participants had sex most frequently with primary partners. Condom use was lowest within primary partner relationships. Regardless of partner type, condom use varied consistently depending on the frequency of sex with the same partner.

CONCLUSIONS

Condom use is related to the frequency of sex between partners when partner type is controlled. The association between frequency of sex and condom use is independent of partner type, suggesting that partner type may become less influential in determining condom use as the frequency of sex increases. This finding suggests that contextual factors determining condom use go beyond partner type designations and include other relationship variables.

Sexually transmitted infections among HIV seropositive men and women

OBJECTIVES

To determine the prevalence of identified STIs and recognised symptoms of STIs and their association with health status, substance use, and sexual risk behaviour in a sample of HIV seropositive men and women.

METHODS

223 men, 112 women, and five transsexual people living with HIV infection completed confidential surveys. Participants were recruited through community based services, community health clinics, and snowball (chain) recruitment techniques in Atlanta, GA, USA in December 1999.

RESULTS

We found that (263) 78% of participants had been sexually active in the previous 3 months. For the entire sample, 42 (12%) participants reported an STI in the past 3 months and 40 (11%) experienced symptoms of an STI without indicating a specific diagnosis in that time. Gonorrhoea, chlamydia, syphilis, and newly diagnosed herpes simplex virus (HSV) were identified at similar rates among men, whereas trichomonas, gonorrhoea, and newly diagnosed HSV occurred most often in women. STIs were associated with substance use in men and women, with "crack" cocaine users having the greatest likelihood of an STI relative to non-crack users. STIs were also associated with continued practice of sexual risk behaviours.

CONCLUSIONS

This sample of people living with HIV-AIDS reported high rates of diagnoses and symptoms of STIs. There were significant associations between STIs, substance use, and continued high risk sexual practices in men and women. These findings support the need for studies that confirm prevalence of STIs using clinical laboratory tests.

Evaluating AIDS prevention interventions using behavioral and biological outcome measures

OBJECTIVE

To begin a dialogue on the role of behavioral and biological outcome measures in evaluating the effectiveness of behavior change interventions to reduce the risk of transmitting and acquiring HIV and other sexually transmitted diseases (STDs).

METHODS

A selective review of the literature was undertaken to identify issues and problems associated with the use of behavioral and biological outcome measures. In particular, the article considers the validity of self-reports and the theoretical relationships between behavioral and biological measures.

RESULTS

Available data suggest that when proper care is taken, behavioral self-reports are valid. Similarly, sensitive and specific diagnostic tests are available, particularly for bacterial STDs. However, even when diagnostic tests and behavioral self-reports provide valid data, one should not expect a simple relationship between behavioral and biological measures.

CONCLUSION

Both behavioral and biological measures are important outcomes for studying the efficacy and effectiveness of behavior-change interventions. However, one measure cannot substitute for or validate the other, and neither serves as a true surrogate for HIV prevalence or incidence. Therefore, it is important to better understand the relationship among STDs, HIV, and self-reported condom use. To do this, it will first be necessary to assess correct as well as consistent condom use.

Condom availability for HIV/STD prevention

Condom availability is a structural intervention that increases access to condoms. It is the most important strategy for the prevention of the sexual transmission of HIV/STDs in developing countries. While it is an integral component of many prevention programs, it is considered controversial in high school settings and its role in a variety of HIV/STD prevention interventions has been understudied, understated, and/or unacknowledged. Condom availability as an HIV/STD prevention strategy needs to be reprioritized and should be considered a critical foundation of all programs to prevent the sexual transmission of HIV.

Evaluation of behavioural interventions in HIV/STI prevention

There is an urgent need for well designed randomised trials to assess the impact of behavioural interventions at both individual and community levels in developed and developing countries. The relative lack of such studies partly reflects the particular challenges of applying randomised trials in this area. Although there are obvious differences between clinical and behavioural interventions, the principles underlying successful evaluation are not fundamentally different. Experience gained from clinical trial methodology over the past two decades should be applied and further developed to tackle the demands and challenges of evaluating behavioural interventions in HIV/STI prevention.

The social impact of HIV testing: a comparative analysis of Britain and Sweden

The role of HIV testing in the primary prevention of HIV is as yet unclear. Whereas most outcome evaluations have tended to focus on the impact of HIV testing and counselling on individuals' risk behaviours, this paper argues for a fresh perspective on HIV testing which takes into account its social impact. To illustrate the importance of the social impact of HIV testing, the paper compares HIV testing policies in the context of HIV prevention in Britain and in Sweden. It shows how contrasting representations of HIV testing and different practices around testing have had different social, economic and public health consequences in the two countries. The paper concludes with a recommendation that policy makers take fuller account of the social dimension of HIV testing in the future development of HIV testing policies.

A randomized, controlled trial of a behavioral intervention to prevent sexually transmitted disease among minority women

BACKGROUND

African-American and Hispanic women are disproportionately affected by sexually transmitted diseases, including the acquired immunodeficiency syndrome (AIDS). In the effort to reduce infection rates, it is important to create and evaluate behavioral interventions that are specific to the target populations.

METHODS

We enrolled women with nonviral sexually transmitted diseases in a randomized trial of a sex- and culture-specific behavioral intervention. The intervention consisted of three small-group sessions of three to four hours each designed to help women recognize personal susceptibility, commit to changing their behavior, and acquire necessary skills. The control group received standard counseling about sexually transmitted diseases. The design of the intervention was based on the AIDS Risk Reduction Model and ethnographic data on the study populations. Participants in both groups underwent screening, counseling, and an interview before randomization and at the 6- and 12-month follow-up visits. The principal outcome variable was subsequent chlamydial or gonorrheal infection, which was evaluated on an intention-to-treat basis by logistic-regression analysis.

RESULTS

A total of 424 Mexican-Americans and 193 African-American women were enrolled; 313 were assigned to the intervention group and 304 to the control group. The rate of participation in the intervention was 90 percent. The rates of retention in the sample were 82 and 89 percent at the 6- and 12-month visits, respectively. Rates of subsequent infection were significantly lower in the intervention group than in the control group during the first 6 months (11.3 vs. 17.2 percent, P=0.05), during the second 6 months (9.1 vs. 17.7 percent, P=0.008), and over the entire 12-month study period (16.8 vs. 26.9 percent, P=0.004).

CONCLUSIONS

A risk-reduction intervention consisting of three small-group sessions significantly decreased the rates of chlamydial and gonorrheal infection among Mexican-American and African-American women at high risk for sexually transmitted disease.

Reliability and validity of a self-efficacy instrument for protective sexual behaviors

The authors investigated the psychometric properties of a 22-item scale that measured respondents' perceptions of their ability to refuse sexual intercourse, question potential sexual partners, and use condoms. Two hundred twenty-one male and female undergraduates completed an anonymous questionnaire that measured a wide range of constructs. The scale exhibited good internal consistency, and convergent validity was demonstrated for 5 sexual behavior items (number of sexual partners ever and in the past 3 months, condom use in past 3 months, at last intercourse, and in the future). The instrument appeared to be free of social desirability bias and was reliable and valid for assessing college students' self-efficacy for protective sexual behaviors. College healthcare professionals could administer the instrument to help students determine their levels of self-efficacy for engaging in self-protective behaviors and identify domains in which they may need to improve their skills to reduce their risks of acquiring a sexually transmitted disease or having or causing an unplanned pregnancy.

The validity of self-reported condom use among adolescents

BACKGROUND

Research and public health interventions designed to reduce the risk of sexually transmitted diseases (STDs) often are based on self-reported condom use. Yet, validation of self-reported condom use, in particular with adolescents, has rarely been described in the literature.

METHODS

Baseline data were obtained from 540 adolescents, 13-21 years of age, enrolled in a 1-year longitudinal study of health beliefs, sexual behaviors, and STD acquisition. Of the 445 participants reporting to be sexually active, 404 (90.8%) agreed to a complete physical examination, including a genital examination, with STD screening after completing the self-administered written questionnaire. Participants' written self-report of condom use was compared to histories obtained by clinicians and laboratory diagnosis of acute STDs to assess validity of written self-report.

RESULTS

Complete data were available for 321 females and 77 males of whom 52 females and 5 males had laboratory evidence of 63 infections. Although three individuals who had STDs reported to be consistent users of condoms, a significant association (P < 0.05) was found between those who reported more frequent condom use with the last two partners and the absence of STDs.

CONCLUSION

In this group of adolescents, self-report of condom use with the last two partners was associated with the absence of an acute STD. This finding suggests that self-reported condom use is a valid indicator of risk for STDs, with implication for those working with adolescents clinically and in research contexts.