Table 1.
Descriptive characteristics of sexually active 9–12th graders, 1999–2007 YRBS (N=24,638)‡
| Males (n=12,494) | Females (n=12,144) | |||
|---|---|---|---|---|
| Variable | % | 95% CI | % | 95% CI |
| Age of participant, years | ||||
| ≤ 15 | 25.5 | 24.2–26.9 | 24.3 | 23.2–25.4 |
| 16 | 26.0 | 24.9–27.1 | 28.0 | 26.7–29.3 |
| ≥ 17 | 48.5 | 46.9–50.1 | 47.7 | 46.2–49.3 |
| Race | ||||
| Caucasian | 63.6 | 60.6–66.4 | 66.4 | 63.6–69.1 |
| African American | 19.5 | 17.2–21.9 | 18.8 | 16.6–21.2 |
| Hispanic | 17.0 | 15.3–18.8 | 14.8 | 13.2–16.6 |
| Contraception use at last sexual intercourse by race | ||||
| Caucasian | ||||
| Condoms only | 63.6 | 61.9–65.3 | 48.1 | 42.2–50.0 |
| Dual method‡‡ | 6.1 | 5.4–7.0 | 8.5 | 7.7–9.4 |
| Birth control pills only | 9.3 | 8.3–10.4 | 15.8 | 14.6–17.2 |
| DMPA only | 1.2 | 0.9–1.6 | 2.9 | 2.4–3.6 |
| Withdrawal only | 8.5 | 7.5–9.6 | 10.7 | 9.7–11.9 |
| No method/unsure | 11.4 | 10.2–12.6 | 14.0 | 12.7–15.3 |
| African American | ||||
| Condoms only | 75.5 | 73.4–77.4 | 62.0 | 58.9–64.9 |
| Dual method‡‡ | 2.6 | 2.0–3.4 | 5.9 | 4.8–7.2 |
| Birth control pills only | 2.4 | 1.8–3.2 | 6.8 | 5.4–8.5 |
| DMPA only | 0.5 | 0.3–0.9 | 3.0 | 2.3–3.9 |
| Withdrawal only | 6.0 | 5.0–7.2 | 7.2 | 6.1–8.5 |
| No method/unsure | 13.0 | 11.4–14.8 | 15.2 | 13.3–17.2 |
| Hispanic | ||||
| Condoms only | 66.0 | 63.1–68.9 | 50.6 | 47.3–53.9 |
| Dual method‡‡ | 3.0 | 2.0–4.5 | 3.7 | 2.8–4.9 |
| Birth control pills only | 5.0 | 4.0–6.2 | 6.7 | 5.2–8.5 |
| DMPA only | 0.7 | 0.4–1.5 | 1.8 | 1.2–2.8 |
| Withdrawal only | 6.8 | 5.5–8.3 | 11.8 | 10.3–13.4 |
| No method/unsure | 18.5 | 16.4–20.8 | 25.5 | 22.7–28.5 |
| Risk scale | ||||
| 4 | 16.0 | 14.8–17.2 | 13.7 | 12.7–14.8 |
| 3 | 46.5 | 45.0–48.1 | 45.9 | 44.4–47.3 |
| 2 | 20.1 | 18.9–21.3 | 24.2 | 23.0–25.5 |
| 1 | 12.2 | 11.4–13.2 | 12.6 | 11.7–13.5 |
| 0 | 5.3 | 4.8–5.8 | 3.7 | 3.2–4.2 |
| Number of sexual partners | ||||
| 6+ | 20.6 | 18.9–22.4 | 12.1 | 11.1–13.2 |
| 2–5 | 45.3 | 44.0–46.7 | 48.1 | 46.9–49.3 |
| 1 | 34.1 | 32.6–35.6 | 39.8 | 38.5–41.2 |
| Age of sexual debut | ||||
| ≤ 12 | 18.6 | 17.4–19.9 | 8.7 | 7.9–9.6 |
| 13–14 | 35.0 | 33.7–36.3 | 34.5 | 33.2–35.9 |
| 15–16 | 37.5 | 35.9–39.2 | 47.8 | 46.5–49.1 |
| ≥ 17 | 8.9 | 8.1–9.8 | 9.0 | 8.2–9.8 |
‡
Abbreviations: YRBSS: Youth Risk Behavior Surveillance System, DMPA = medroxyprogesterone acetate (i.e., injectable birth control), CI, confidence interval.
‡‡
Dual method = condoms plus birth control pills or DMPA