Chiao et al. BMC Public Health 2012, 12:527 http://www.biomedcentral.com/1471-2458/12/527 Page 7 of 10 Table 2 Results from TYP (N=1,777) multivariate logistic regression models of predicting involvement in premarital sex by age 22, (0.5-1.5) (0.5-1.4) (1.6-5.5) (1.3-4.7) Male Model 1 AOR 95% CI Model 2 AOR 95% CI Model 3 AOR 95% CI Model 2 AOR 95% CI Model 3 AOR 95% CI 2.4** 1.0 2.0 1.2 1.0 (1.4-4.0) (1.2-3.5) (1.2-3.9) (0.7-6.5) (0.3-3.3) (0.3-3.7) (0.9-4.4) (0.8-1.9) (1.0-7.5) (0.9-2.3) (1.1-8.4) (1.5-3.8) (0.7-6.0) (1.4-4.2) Covariates at age 20 Adolescent risky health behavior Adolescent's cigarettes use Smokers Non-smokers Adolescent's alcohol use Heavier drinkers Light drinkers Abstainers Peers characteristics Perceived cigarettes use of close friends Smokers Non-smokers Perceived alcohol use of close friends Heavier drinkers Light drinkers Abstainers Perceived sexual behavior of close friends Half or greater Less than half None or unknown Attitude toward premarital sex Premarital sex permissiveness Stressful life and behavioral events Stressful school events Yes No Number of stressful personal events 2 or more 1 0 Deviant behaviors Yes No Psychological complaints Family SES Maternal education College or higher Senior HS Junior HS or lower Monthly family income 1.0 1.0 2.0 2.1* 1.0 2.4** 1.0 1.1 0.7 1.0 1.8 1.2 1.0 0.9 1.0 1.7* 1.6} 1.0 1.1 1.0 1.0 0.7 0.9 1.0 1.1* (0.7-5.9) (1.2-3.6) (0.3-4.4) (0.4-1.2) (0.8-4.0) (0.7-2.1) (0.5-1.5) (1.001-3.0) (0.995-2.5) (0.6-1.8) (1.0-1.0) (0.4-1.1) (0.6-1.3) (1.004-1.2) 1.6** (1.2-2.3) 2.0** 1.0 2.7} 1.4 1.0 0.9 1.0 0.5 0.7 1.0 3.5*** 1.4} 1.0 (0.2-1.4) (0.4-1.2) (1.9-6.5) (0.9-2.2) 2.1* 1.0 2.7* 1.2 1.0 0.9 1.0 0.5 0.7 1.0 3.1** 1.4 1.0 1.3} 0.6 1.0 2.7*** 1.4} 1.0 1.0 1.0 1.0 0.6* 0.9 1.0 1.1 (1.1-6.8) (0.8-2.1) (0.2-1.3) (0.4-1.2) (1.6-6.1) (0.9-2.1) (0.97-1.9) (0.3-1.1) (1.6-4.7) (0.96-2.1) (0.7-1.4) (1.0-1.0) (0.3-0.99) (0.6-1.4) (1.0-1.1) Female Model 1 AOR 95% CI 2.1 1.0 3.0* 2.4*** 1.0 0.9 1.0 2.0 2.4** 1.0 3.0*** 1.0 0.9 0.7 1.0 2.5* 1.6* 1.0 (0.4-1.3) (0.2-3.5) (1.2-5.2) (1.03-2.5)