Table 1.
Sample Characteristics at Baseline Stratified by Age at Enrollment (N=358)
| Sample n (%) | Age at Enrollment (years) | p-value | ||||
|---|---|---|---|---|---|---|
| Characteristics | 14 (N=103) | 15 (N=106) | 16 (N=88) | 17 (N=61) | ||
| Socio-Demographics | ||||||
| Mean age, years (±SD) | 15.3 ±1.1 | --- | --- | -- | --- | --- |
| Race | ||||||
| Black | 319 (89) | 92 (89) | 95 (90) | 78 (89) | 54 (89) | 0.7 |
| White | 34 (10) | 9 (9) | 11 (10) | 9 (10) | 5 (8) | |
| Hispanic | 4 (1) | 1 (1) | 0 (0) | 1 (1) | 2 (3) | |
| Hawaiian/Pacific Islander | 1 (0.3) | 1 (1) | 0 (0) | 0 (0) | 0 (0) | |
| Sexual History* | ||||||
| Median age at coitarche, years | 14 | 13 | 14 | 14 | 14 | ---* |
| Median number of lifetime sex partners | 3 | 2 | 3 | 3 | 4 | ---* |
| Median number of sex partners in last 3 months | 1 | 1 | 1 | 1 | 1 | ---* |
| Last sexual encounter before enrollment | ||||||
| < 1 month | 137 (56) | 24 (48) | 29 (44) | 41 (56) | 43 (78) | <0.01 |
| 1–3 months | 44 (18) | 11 (22) | 13 (20) | 14 (19) | 6 (11) | |
| 3–6 months | 31 (13) | 7 (14) | 9 (14) | 14 (19) | 1 (2) | |
| 6–12 months | 20 (8) | 5 (10) | 12 (18) | 1 (1) | 2 (4) | |
| > 12 months | 12 (5) | 3 (6) | 3 (5) | 2 (4) | 3 (5) | |
| Sexual Behaviors | ||||||
| Deep kissing | 300 (84) | 81 (79) | 87 (82) | 77 (88) | 55 (90) | 0.18 |
| Had breasts touched by a partner | 293 (82) | 70 (68) | 86 (81) | 81 (92) | 56 (92) | <0.01 |
| Had genitals touched | 240 (67) | 47 (46) | 70 (66) | 72 (82) | 51 (84) | <0.01 |
| Touched a partner’s genitals | 201 (56) | 41 (40) | 52 (49) | 64 (73) | 44 (72) | <0.01 |
| Gave oral sex | 47 (13) | 8 (8) | 8 (8) | 10 (11) | 21 (34) | <0.01 |
| Received oral sex | 110 (31) | 20 (19) | 23 (22) | 32 (36) | 35 (57) | <0.01 |
| Had vaginal sex | 268 (75) | 57 (55) | 76 (72) | 79 (90) | 56 (92) | <0.01 |
| Had anal sex | 20 (6) | 2 (2) | 4 (4) | 8 (9) | 6 (10) | 0.11 |
| Attitudes towards Sex† | ||||||
| Personal attitudes | 0.66±0.18 | 0.65±0.19 | 0.64±0.19 | 0.69±0.17 | 0.67±0.18 | 0.19 |
| Perceived peer attitudes | 0.71±0.16 | 0.66±0.16 | 0.74±0.16 | 0.74±0.16 | 0.73±0.14 | <0.01 |
| Perceived family attitudes | 0.60±0.16 | 0.56±0.15 | 0.60±0.16 | 0.61±0.16 | 0.63±0.15 | 0.03 |
*
Response options for these questions included age groups so no statistical test could be perform.
†
Each average scale score is scaled to allow direct comparisons (i.e., divided by the total number of items in the scale).