Predicting Sexual Initiation in a Prospective Cohort Study of Adolescents

Department of Pediatrics, Boston Medical Center, 850 Harrison Ave, Boston, MA 02118, USA.
JAMA Pediatrics (Impact Factor: 5.73). 01/2008; 162(1):55-9. DOI: 10.1001/archpediatrics.2007.12
Source: PubMed


To determine whether a new scale measuring beliefs about postponing sexual initiation (PSI) predicts sexual initiation and whether the association between PSI and sexual initiation is mediated by intention to initiate sexual intercourse.
Prospective cohort study.
The Growing Up Today Study, a longitudinal cohort study of adolescents.
A total of 11,448 adolescents aged 12 to 17 years who reported in 1999 that they had never had sexual intercourse.
Beliefs and attitudes about PSI measured in 1999 (12-item scale, Cronbach alpha = 0.86). Higher PSI scale scores indicated stronger beliefs about postponing sex.
Sexual intercourse reported on the 2000 survey.
The mean (SD) age of participants was 14.3 (1.5) years, and 94.4% were white. Of the participants, 7.5% of boys and 10.1% of girls initiated sexual intercourse between 1999 and 2000. The PSI scale score was inversely associated with intention to initiate sex and with sexual initiation in boys and girls (P < .001 for both). Intention to initiate sex was positively associated with sexual initiation (P < .001). In multivariate models, PSI scale scores were inversely associated with sexual intercourse initiation in boys (odds ratio, 0.90 for a 1-U increase in PSI scale score; 95% confidence interval, 0.87-0.93; P < .001) and girls (odds ratio, 0.91; 95% confidence interval, 0.89-0.93; P < .001). The strength of the association decreased when intention to initiate sexual intercourse was added to both models.
A new scale measuring beliefs and attitudes about PSI predicted sexual intercourse initiation in the next year, and intention to initiate sex mediated this association.

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    • "Adolescents' perceptions that peers are sexually active has been shown to influence adolescents' intentions to initiate sexual intercourse (Kinsman, Romer, Furstenberg, & Schwarz, 1998). Intention to initiate intercourse is one of the strongest predictors of initiating sexual intercourse (Gray et al., 2008). In one study, adolescents who reported intention to become sexually active in the next 6 months were significantly more likely to do so, compared to peers who were uncertain or did not intend to initiate intercourse (Stanton et al., 1996). "
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    ABSTRACT: Many older adolescents display sexual references on their social networking site profiles; this study investigated whether these references were associated with self-reported sexual intention, sexual experience, or risky sexual behavior. Public Facebook profiles of undergraduate freshmen were identified within 1 large U.S. university Facebook network. Profile owners who displayed sexual references (Displayers) and did not display references (Non-Displayers) were invited to complete surveys. Surveys measured sexual intention, using the Postponing Sexual Intercourse (PSI) scale, and sexual experiences. A higher PSI score was inversely related to intention to initiate sexual intercourse. Of the 118 profiles that met inclusion criteria, 85 profile owners completed surveys. Profile owners were mostly female (56.5%) and Caucasian (67.1%). The mean PSI score for Displayers was 6.5 ± 1.6, and the mean PSI score for Non-Displayers was 10.2 ± 0.6 (p = .02). There were no differences between Displayers and Non-Displayers regarding lifetime prevalence of sexual behavior, number of sexual partners, or frequency of condom use. Display of sexual references on college freshmen's Facebook profiles was positively associated with reporting intention to initiate sexual intercourse. Facebook profiles may present an innovative cultural venue to identify adolescents who are considering sexual activity and may benefit from targeted educational messages.
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    ABSTRACT: Using a randomized controlled trial, this study evaluated the effects of media messages targeting parents on the sexual beliefs of 404 adolescents. The messages aimed to increase parent-child communication about waiting to initiate sexual activity. Compared with children of unexposed parents, children of parents exposed to media messages were more likely to believe that teen sexual activity is psychologically harmful. However, effects varied by parent and adolescent gender; treatment effects were only significant among adolescents whose opposite-sex parent was exposed. Parent exposure strengthened beliefs that teen sexual activity is physically harmful only among adolescents with at least 1 sexually active friend.
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