TABLE 3—

Results From Multilevel Logistic Regression Models of Behavioral Outcomes and Intraclass Correlations: Effectiveness of It’s Your Game…Keep It Real, South Carolina, 2011–2014

	Benchmark			Sensitivity 1b		Sensitivity 2c
Outcome variables	No.	AORa (95% CI)	ICC	No.	AORa (95% CI)	No.	AORa (95% CI)
Initiation of vaginal sex
By end of eighth grade	2501	1.18 (0.91, 1.53)	0.002	2501	1.11 (0.74, 1.64)	2256	1.17 (0.90, 1.52)
By end of ninth grade	2268	1.27 (1.01, 1.59)	0.000	2268	1.23 (0.92, 1.64)	2049	1.26 (1.00, 1.58)
Had vaginal sex in past 3 mo
Yes	2392	1.24 (0.94, 1.64)	0.006	2392	1.16 (0.84, 1.61)	2156	1.25 (0.95, 1.66)
Without effective birth control	2392	1.11 (0.77, 1.58)	0.001	2392	1.03 (0.69, 1.52)	2156	1.13 (0.79, 1.61)
Without condom	2387	1.30 (0.93, 1.81)	0.000	2387	1.23 (0.89, 1.72)	2151	1.33 (0.95, 1.86)

Note. AOR = adjusted odds ratio; CI = confidence interval; ICC = intraclass correlation. Estimates were obtained from logistic multilevel models that specified school as a random effect. All models were adjusted for the following school-level design factors: school configuration, enrollment size, and proportion of students who reported having had sex at baseline. All models were also adjusted for the following potential student-level confounders: age, gender, race/ethnicity, number of months between baseline and ninth grade follow-up survey, late enrollment into the study (i.e., January to February 2012), and academic grades. Models addressing recent sexual behaviors also included the student’s baseline measure of the outcome.

^aAn AOR > 1 indicates that more students in the intervention condition reported doing the behavior relative to those in the comparison condition.

^bSensitivity analyses excluding the school-level covariate “ever had sex.”

^cSensitivity analyses excluding the students who completed a baseline survey in February 2012.