Baseline demographic and relationship characteristics of 122 female participants
| Characteristic | Total sample | STI negative* (n=95) | STI positive* (n=22) | P value |
| Age in years, mean (SD) | 18.4 (1.1) | 18.4 | 18.4 | 0.94 |
| African-American race, n (%) | 112 (92) | 93% | 91% | 0.78 |
| Age at first sex, mean (SD) | 13.9 (3.3) | 13.8 | 14.0 | 0.80 |
| Maternal education <high school, n(%) | 79 (65) | 67% | 64% | 0.74 |
| Lifetime no of sexual partners, mean (SD); median | 8 (11); 5 | 7.6 | 7.3 | 0.91 |
| No of sexual partners in the past 3 months, mean (SD); median | 2 (3); 1 | 2.0 | 1.9 | 0.86 |
| Condom use at first sex with partner, n (%) | 83 (73) | 72% | 81% | 0.42 |
| Condom use at last sex with partner, n (%) | 53 (47) | 44% | 57% | 0.27 |
| STD history, n (%) | 67 (55) | 53% | 68% | 0.19 |
| Length of relationship in months, mean (SD); median | 17.5 (20.0); 13 | 17.8 | 17.5 | 0.97 |
*Participants were tested for C. trachomatis and N. gonorrhoeae at baseline.