Table 2.
Ordinary least squares regression results for sexual initiation, recent sex, and sex without a condom: Important predictors (statistically significant or having a standardized coefficient of 0.10 or higher).
| Initiation | Recent sex | Sex without a condom | ||
|---|---|---|---|---|
| Substance use scale | 0.202** | Ever had sex | 0.364*** | 0.257*** |
| (0.0964) | (0.0361) | (0.0332) | ||
| Summer between baseline and follow-up | 0.131*** | Substance use scale | 0.273*** | 0.220*** |
| (0.0502) | (0.0600) | (0.0549) | ||
| Grade 9 | 0.131* | Had sex in last three months | 0.202*** | 0.0606 |
| (0.0766) | (0.0588) | (0.0545) | ||
| Touching scale | 0.126*** | Been pregnant or gotten someone pregnant | 0.135 | 0.168* |
| (0.0485) | (0.110) | (0.100) | ||
| Opportunity scale | 0.123** | Summer between baseline and follow-up | 0.0800** | 0.0783** |
| (0.0478) | (0.0363) | (0.0332) | ||
| Sexting scale | 0.120** | In a serious relationship | 0.0625** | 0.0445* |
| (0.0523) | (0.0289) | (0.0263) | ||
| Refusal skill | 0.118** | In a casual relationship | 0.0496* | 0.0380 |
| (0.0538) | (0.0277) | (0.0252) | ||
| In a serious relationship | 0.107** | How many times had sex in past three months | 0.00893** | 0.0134*** |
| (0.0428) | (0.00380) | (0.00375) | ||
| Girl | −0.102*** | Grade 9 | −0.0324 | −0.101** |
| (0.0371) | (0.0563) | (0.0511) | ||
| Age | −0.0334 | −0.0380** | ||
| (0.0210) | (0.0192) | |||
| Other BL predictors | X | X | X | |
| n | 833 | 1,294 | 1,282 | |
| R-squared | 0.211 | 0.363 | 0.314 | |
| Share predicted correctly | 0.806 | 0.811 | 0.854 |
Note: Other baseline predictors include those listed in Table 1 (omitted categorical variables include not being in a relationship, being a boy, and being attracted to different-gender people) and cluster fixed effects.
Students who have not had sex are asked questions about pre-sexual behaviors that students who have had sex are not asked. Regressions for initiation include students who have not had sex at baseline. They include pre-sexual behavior as covariates but not sexual behavior, because these students have not had sex. The regressions for recent sex or sex without a condom include all students and therefore include sexual behaviors as covariates but not pre-sexual behavior, because sexually experienced students were not asked all of these questions.