TABLE 3—
Mean Ages at Initiation, Regression Coefficients, and SE of First Oral-Genital, Vaginal, and Anal Intercourse Among Respondents Who Reported Initiation by Age 18, by Sociodemographic Characteristics: National Longitudinal Study of Adolescent Health, 2008
| Oral-Genital Intercourse Before Age 18 (n = 8912) |
Vaginal Intercourse Before Age 18 (n = 10 343) |
Anal Intercourse Before Age 18 (n = 1368) |
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| Sociodemographic Characteristics | Mean Age at Initiation (SE) | b (SE) | Mean Age at Initiation (SE) | b (SE) | Mean Age at Initiation (SE) | b (SE) |
| Biological sex | ||||||
| Male | 15.6 (0.03) | −0.43*** (0.06) | 15.5 (0.03) | −0.06 (0.05) | 16.3 (0.09) | −0.42* (0.17) |
| Female | 16.0 (0.03) | 1.00 | 15.5 (0.02) | 1.00 | 16.7 (0.08) | 1.00 |
| Race/ethnicity | ||||||
| Non-Hispanic White | 15.8 (0.03) | 1.00 | 15.6 (0.02) | 1.00 | 16.4 (0.08) | 1.00 |
| Non-Hispanic Black | 15.8 (0.06) | 0.16 (0.09) | 15.1 (0.04) | −0.41*** (0.09) | 16.4 (0.20) | 0.25 (0.37) |
| Hispanic | 15.7 (0.06) | −0.02 (0.13) | 15.4 (0.06) | −0.14 (0.13) | 16.4 (0.13) | 0.20 (0.27) |
| Non-Hispanic Asian | 16.3 (0.08) | 0.37** (0.12) | 16.0 (0.08) | 0.24 (0.13) | 16.8 (0.28) | 0.50 (0.49) |
| Non-Hispanic American Indian | 15.9 (0.13) | 0.19 (0.18) | 15.4 (0.15) | −0.12 (0.18) | 16.8 (0.26) | 0.49 (0.29) |
| Non-Hispanic other race | 15.3 (0.33) | −0.44 (0.45) | 15.4 (0.17) | −0.16 (0.24) | 15.6 (0.59) | −0.67 (0.62) |
| Family structure | ||||||
| 2 biological parents | 16.0 (0.03) | 1.00 | 15.8 (0.02) | 1.00 | 16.7 (0.08) | 1.00 |
| Other 2 parent | 15.7 (0.05) | −0.30*** (0.07) | 15.3 (0.04) | −0.45*** (0.06) | 16.4 (0.13) | −0.29 (0.18) |
| Single mom | 15.5 (0.06) | −0.52*** (0.09) | 15.2 (0.04) | −0.42*** (0.08) | 16.1 (0.18) | −0.68 (0.35) |
| Single dad | 15.4 (0.12) | −0.59** (0.19) | 14.9 (0.12) | −0.79*** (0.18) | 16.4 (0.21) | −0.21 (0.24) |
| Other | 15.5 (0.12) | −0.55** (0.15) | 14.9 (0.08) | −0.71*** (0.13) | 15.5 (0.42) | −1.13 (0.59) |
| Parent education | ||||||
| < high school | 15.6 (0.06) | −0.24 (0.13) | 15.3 (0.06) | −0.42*** (0.11) | 16.0 (0.20) | −0.44 (0.41) |
| High-school diploma or general equivalency diploma | 15.7 (0.04) | −0.19* (0.08) | 15.3 (0.04) | −0.43*** (0.07) | 16.5 (0.10) | 0.03 (0.28) |
| Some college | 15.9 (0.04) | 0.03 (0.07) | 15.5 (0.03) | −0.23** (0.06) | 16.6 (0.11) | 0.10 (0.32) |
| ≥ College graduate | 15.9 (0.03) | 1.00 | 15.9 (0.03) | 1.00 | 16.5 (0.13) | 1.00 |
| Pubertal timing | ||||||
| Early | 15.6 (0.03) | −0.34*** (0.05) | 15.2 (0.03) | −0.45*** (0.06) | 16.4 (0.09) | 0.07 (0.20) |
| Typical | 16.0 (0.03) | 1.00 | 15.7 (0.03) | — | 16.4 (0.12) | — |
| Late | 16.0 (0.05) | 0.08 (0.09) | 15.7 (0.05) | 0.09 (0.08) | 16.6 (0.14) | 0.26 (0.23) |
| Age, y | ||||||
| 24–29 | 15.8 (0.02) | −0.08 (0.08) | 15.5 (0.02) | −0.04 (0.08) | 16.5 (0.07) | 0.22 (0.23) |
| ≥ 30 | 15.8 (0.04) | 1.00 | 15.5 (0.04) | 1.00 | 16.2 (0.15) | 1.00 |
Note. Means are weighted to reflect national population estimates.
*P < .05; **P < .01; ***P < .001.