Table 1.
Characteristics of the unweighted and weighted sample of young adults aged 18–27 years, waves 1–3 of the National Longitudinal Study of Adolescent Health (Add Health), N = 11,460
| Unweighted sample | Weighted sample | |
|---|---|---|
| % | % (SE) | |
| Positive urine screen for Chlamydia | 4.6 | 4.1 (0.36) |
| Male | 47.2 | 50.5 (0.68) |
| Race and ethnicity | ||
| Hispanic | 16.3 | 11.6 (1.73) |
| Black | 20.5 | 15.3 (1.97) |
| Other | 8.0 | 4.5 (0.79) |
| White (reference) | 55.2 | 68.6 (2.91) |
| Foreign born | 7.9 | 5.7 (0.85) |
| Heterosexual orientation (w3) | 89.3 | 89.3 (0.45) |
| Parental economic hardship (w1) | 17.0 | 17.3 (1.27) |
| Two parent household (w1) | 54.5 | 56.8 (1.28) |
| Economic hardship (w3) | 7.0 | 6.9 (0.51) |
| Employed (w3) | 70.1 | 70.2 (1.01) |
| Enrolled in school (w3) | 38.0 | 37.0 (1.53) |
| Married (w3) | 17.6 | 17.2 (0.99) |
| Living with parents (w3) | 39.9 | 39.1 (1.33) |
| Antibiotics prior month (w3) | 13.5 | 13.7 (0.49) |
| Age at first vaginal intercourse | ||
| 18–25 years | 27.6 | 26.2 (0.98) |
| 16–17 years | 30.7 | 31.0 (0.62) |
| 10–15 years | 29.1 | 30.3 (1.01) |
| Has not has vaginal intercourse | 12.6 | 12.5 (0.56) |
| STI in prior year (w1) | 2.2 | 2.2 (0.27) |
| 3+ sex partners prior year (w3) | 14.7 | 15.0 (0.53) |
| Condom use last sex (w3) | 56.7 | 56.3 (0.73) |
| Drug use prior year (w3) | 22.7 | 24.5 (0.79) |
| Depression | ||
| Depressed wave 1 only | 12.3 | 11.0 (0.49) |
| Depressed wave 3 only | 15.3 | 15.1 (0.55) |
| Depressed waves 1 and 3 | 6.4 | 6.1 (0.37) |
| Never depressed (reference) | 66.0 | 67.7 (0.70) |
| Mean (SD) | Mean (SE) | |
| Age in years (w1) range 11–21 years | 15.6 (1.73) | 15.4 (0.12) |
| Number times moved since wave 1 range 0–10 | 2.1 (2.14) | 2.1 (0.07) |
| Binge drinking prior year (w3) range 0–6 | 1.20 (1.56) | 1.34 (0.05) |