Douglas Kirby

Older boyfriends and girlfriends increase risk of sexual initiation in young adolescents

PURPOSE To explore the prevalence and impact of older boyfriends or girlfriends on sexual behavior in sixth graders (mean age 11.5 years). METHODS Students in 19 ethnically diverse middle schools in an urban area were surveyed (n = 2829, response rate 68%). Instrument measured demographics, age of oldest boyfriend or girlfriend, unwanted sexual advances, peer norms, and sexual behavior. Students with older, same-age, or no boyfriend or girlfriend were compared on demographic and psychosocial variables using analysis of variance. Separate multivariate logistic regressions for both boys and girls were used to predict sexual behavior from demographics, psychosocial variables, and age categories of boyfriend or girlfriend. RESULTS One-half of the respondents (56%) had never had a serious boyfriend or girlfriend, 35% reported that their oldest boyfriend or girlfriend was <2 years older than they, and 8.5% reported a partner > or =2 years older. Those reporting an older boyfriend or girlfriend were more likely to be Hispanic, were less acculturated, reported more unwanted sexual advances and more friends who were sexually active, and, among girls, were more likely to have experienced menarche. Overall, 4% of students reported ever having had sex. Students with an older boyfriend or girlfriend were over 30 times more likely than those with no boyfriend or girlfriend ever to have had sex (odds ratio = 33.8 for boys and 44.2 for girls). In the multivariate logistic regressions, peer norms about sexual behavior, having experienced unwanted sexual advances, and having a boyfriend or girlfriend were strongly associated with having had sex. CONCLUSIONS Having an older boyfriend or girlfriend, although rare, is associated with early sexual onset and unwanted sexual activity in this population of sixth graders.

Safer choices: reducing teen pregnancy, HIV, and STDs.

Objectives. This study evaluated the long-term effectiveness of Safer Choices, a theory-based, multi-component educational program designed to reduce sexual risk behaviors and increase protective behaviors in preventing HIV, other STDs, and pregnancy among high school students. Methods. The study used a randomized controlled trial involving 20 high schools in California and Texas. A cohort of 3869 ninth-grade students was tracked for 31 months from fall semester 1993 (baseline) to spring semester 1996 (31-month follow-up). Data were collected using self-report surveys administered by trained data collectors. Response rate at 31-month follow-up was 79%. Results. Safer Choices had its greatest effect on measures involving condom use. The program reduced the frequency of intercourse without a condom during the three months prior to the survey, reduced the number of sexual partners with whom students had intercourse without a condom, and increased use of condoms and other protection against pregnancy at last intercourse. Safer Choices also improved 7 of 13 psychosocial variables, many related to condom use, but did not have a significant effect upon rates of sexual initiation. Conclusions. The Safer Choices program was effective in reducing important risk behaviors for HIV, other STDs, and pregnancy and in enhancing most psychosocial determinants of such behavior.

Six school-based clinics: their reproductive health services and impact on sexual behavior.

An evaluation of the reproductive health programs of six diverse school-based clinics measured the impact of the clinics on sexual behavior and contraceptive use. All six clinics served low-income populations; at five of them, the great majority of the students served were black. An analysis of student visits by type of care given found that these clinics were not primarily family planning facilities; rather, they provided reproductive health care as one component of a comprehensive health program. Student survey data collected in the clinic schools and nearby comparison schools (four sites) or collected both before the clinic opened and two years later (two sites) indicated that the clinics neither hastened the onset of sexual activity nor increased its frequency. The clinics had varying effects on contraceptive use. Providing contraceptives on site was not enough to significantly increase their use; in only one of the three sites that did so were students in the clinic school significantly more likely than students in the comparison school to have used birth control during last intercourse. However, condom use rose sharply at one clinic school that had a strong AIDS education program and was located in a community where AIDS was a salient issue. At another clinic school, where pregnancy prevention was a high priority and staff issued vouchers for contraceptives, the use of condoms and pills was significantly higher than in the comparison school. A third clinic school--which focused on high-risk youth, emphasized pregnancy prevention and dispensed birth control pills--recorded a significantly higher use of pills than its comparison school. Although the data suggest that the clinics probably prevented small numbers of pregnancies at some schools, none of the clinics had a statistically significant effect on school-wide pregnancy rates.

Draw the Line/Respect the Line: A Randomized Trial of a Middle School Intervention to Reduce Sexual Risk Behaviors

OBJECTIVES This study evaluated the long-term effectiveness of Draw the Line/Respect the Line, a theoretically based curriculum designed to reduce sexual risk behaviors among middle school adolescents. METHODS The randomized controlled trial involved 19 schools in northern California. A cohort of 2829 sixth graders was tracked for 36 months. RESULTS The intervention delayed sexual initiation among boys, but not girls. Boys in the intervention condition also exhibited significantly greater knowledge than control students, perceived fewer peer norms supporting sexual intercourse, had more positive attitudes toward not having sex, had stronger sexual limits, and were less likely to be in situations that could lead to sexual behaviors. Psychosocial effects for girls were limited. CONCLUSIONS The program was effective for boys, but not for girls.

The protective role of social capital and cultural norms in Latino communities: a study of adolescent births

This study investigates how community characteristics can protect adolescents from the negative effects of poverty. Using economic predictors, eight communities with low or high birthrates for 15- to 17-year-old Latinas were identified. Quantitative data on birth-rates, demographics, and the physical environment were obtained from government, hospital, and local sources. Qualitative data on the physical environment and social processes in the community were collected by interviews and observations in these eight communities. The low- and high-birthrate communities differed in their physical environment, the characteristics of the population, social capital, and cultural norms. The zip codes with low adolescent birthrates had a higher percentage of residents of Latino descent, stronger social networks, and more ties to their countries of origin. The findings support a model of community building that focuses on strengthening informal social networks and supporting protective cultural norms.

Schoolwide Effects of a Multicomponent HIV, STD, and Pregnancy Prevention Program for High School Students

Few studies have tested schoolwide interventions to reduce sexual risk behavior, and none have demonstrated significant schoolwide effects. This study evaluates the schoolwide effects of Safer Choices, a multicomponent, behavioral theory–based HIV, STD, and pregnancy prevention program, on risk behavior, school climate, and psychosocial variables. Twenty urban high schools were randomized, and cross-sectional samples of classes were surveyed at baseline, the end of intervention (19 months after baseline), and 31 months after baseline. At 19 months, the program had a positive effect on the frequency of sex without a condom. At 31 months, students in Safer Choices schools reported having sexual intercourse without a condom with fewer partners. The program positively affected psychosocial variables and school climate for HIV/STD and pregnancy prevention. The program did not influence the prevalence of recent sexual intercourse. Schoolwide changes in condom use demonstrated that a school-based program can reduce the sexual risk behavior of adolescents.

Manifestations of Poverty and Birthrates Among Young Teenagers in California Zip Code Areas

CONTEXT Given that many communities are implementing community-wide initiatives to reduce teenage pregnancy or childbearing, it is important to understand the effects of a communitys characteristics on adolescent birthrates. METHODOLOGY Data from the 1990 census and from California birth certificates were obtained for zip codes in California. Regression analyses were conducted on data from zip code areas with at least 200 females aged 15-17 between 1991 and 1996, to predict the effects of race and ethnicity marital status, education, employment, income and poverty, and housing on birthrates among young teenagers. RESULTS In bivariate analyses, the proportion of families living below poverty level within a zip code was highly related to the birthrate among young teenagers in that zip code (r=.80, p<.001). In multivariate analyses, which controlled for some of the correlates of family poverty level, the proportion of families living below poverty level remained by far the most important predictor of the birthrate among young teenagers (b=1.54), followed by the proportion of adults aged 25 or older who have a college education (b=-0.80). Race and ethnicity were only weakly related to birthrate. In all three racial and ethnic groups, poverty and education were significantly related to birthrate, but the effect of college education was greater among Hispanics (b=-2.98) than among either non-Hispanic whites (b=-0.53) or blacks (b=-1.12). Male employment and unemployment and female unemployment were highly related to the birthrate among young teenagers in some racial or ethnic groups, but not in others. CONCLUSIONS Multiple manifestations of poverty, including poverty itself, low levels of education and employment, and high levels of unemployment, may have a large impact upon birthrates among young teenagers. Addressing some of these issues could substantially reduce childbearing among young adolescents.

School-based Programs to Reduce Sexual Risk-taking Behavior

Abstract This paper synthesizes 35 evaluations of specific school-based programs designed to reduce sexual risk-taking behavior, including sex and HIV education programs, school-based health centers, and school condom-availability programs. This paper summarizes the effects of those programs on several sexual and contraceptive behaviors. Although the studies have several limitations that restrict any conclusions, the evidence suggests that a few programs have produced credible evidence that they have reduced sexual risk-taking behavior by delaying the onset of intercourse, by reducing the frequency of intercourse, by reducing the number of sexual partners, or by increasing the use of condoms or other forms of contraception. The majority of studies, however, found no statistically significant impact on risk-taking behaviors. Of considerable importance in this controversial field, none of the studies found statistically significant results indicating that any of the programs increased any measure of sexual activity, as is often feared.

Boyfriends girlfriends and teenagers risk of sexual involvement.

CONTEXT Having a boyfriend or girlfriend, especially an older one, is associated with increased sexual risk in early adolescence. The mechanisms underlying this association are unclear. METHODS Middle school students in Northern California were surveyed annually from 1997 to 2000. For a sample of 1,214 males and 1,308 females who were sexually inexperienced in seventh grade, logistic and linear regression were used to explore associations between relationship status in seventh grade and sexual activity in ninth grade, controlling for sixth-grade and eighth-grade characteristics. RESULTS Males who had had a girlfriend their age by seventh grade were more likely than those who had had no relationship to report sexual activity in ninth grade (odds ratio, 2.1). Similarly, for females, the odds of being sexually active in ninth grade were elevated among those who had had a boyfriend their age (2.9); however, they also were higher among those who had had an older boyfriend than among those who had had one their age (2.1). With sixth-grade risk factors controlled, relationship status in seventh grade remained significant only for females; the association was explained by early menarche and by participation in situations that could lead to sex and riskier peer norms in eighth grade. For males, eighth-grade situations that could lead to sex, Hispanic ethnicity and sixth-grade peer norms explained ninth-grade sexual behavior. CONCLUSIONS To reduce the risk of adolescent sexual activity, parents and communities should encourage youth in middle school, especially females who experience early menarche, to delay serious romantic relationships.

The Impact of Programs to Increase Contraceptive Use Among Adult Women: A Review of Experimental and Quasi‐Experimental Studies

CONTEXT Because rates of unintended pregnancy, abortion and unintended birth are very high among adult women in the United States, it is important to identify interventions that can increase contraceptive use in this population. METHODS PubMed, PsycINFO and POPLINE were searched for experimental or quasi-experimental studies published between 1990 and 2005 that evaluated policies or programs designed to increase contraceptive use or reduce pregnancy among adult women in the United States. In addition, relevant journals were searched, experts were asked to provide further citations and several subsequently published articles were included. RESULTS Only 11 studies that assessed programs, and none that assessed policies, were found. The evaluated interventions offered pregnancy and STD prevention counseling (one study); provided contraceptives in settings other than family planning clinics (two studies); had women initiate contraceptive use during the medical visit (two studies); provided advance supplies of emergency contraception (four studies); or implemented systems to remind injectable contraceptive users about their next injection (two studies). The interventions generally had positive, albeit short-term, effects on contraceptive use; none reduced pregnancy rates. Programs that gave women a contraceptive during the visit were the most effective at increasing method use. Advance provision of emergency contraception increased the likelihood of its use and did not affect regular contraceptive use. CONCLUSIONS Very few studies have evaluated interventions to increase contraceptive use among adult women. A research plan that rigorously assesses the impact of different approaches to increasing contraceptive use among adult women should be an integral part of any long-term effort to prevent unintended pregnancy in the United States.