Table 1.
Characteristics of the unweighted and weighted sample, overall and by frequency of penile vaginal intercourse, n = 1647 Americans age 14–17, 2009 and 2018
| Characteristic | Unweighted overall | Weighted overall | No penile vaginal intercourse | Penile vaginal intercourse < once/week | Penile vaginal intercourse at least once/week | p-value* |
|---|---|---|---|---|---|---|
| N = 1647 | N = 1646 | N = 1370 | N = 155 | N = 74 | ||
| N (%) | N (%) | N (%) | N (%) | N (%) | ||
| Sex | .903 | |||||
| Female | 822 (49.9) | 813 (49.4) | 680 (49.6) | 78 (50.5) | 35 (47.3) | |
| Male | 825 (50.1) | 833 (50.6) | 690 (50.4) | 77 (49.5) | 39 (52.7) | |
| Age group | < .0001 | |||||
| 14–15 | 797 (48.4) | 779 (47.3) | 706 (51.6) | 39 (25.0) | 12 (15.7) | |
| 16–17 | 850 (51.6) | 867 (52.7) | 664 (48.5) | 116 (75.0) | 62 (84.3) | |
| Race/ethnicity | .089 | |||||
| White, non-Hispanic | 1158 (70.4) | 947 (57.6) | 802 (58.6) | 82 (52.7) | 39 (53.6) | |
| Black, non-Hispanic | 139 (8.5) | 226 (13.8) | 184 (13.5) | 24 (15.5) | 6 (8.2) | |
| Other or 2 + races, non-Hispanic | 151 (9.2) | 135 (8.2) | 105 (7.7) | 14 (8.9) | 13 (17.0) | |
| Hispanic | 196 (11.9) | 335 (20.4) | 276 (20.2) | 36 (22.9) | 16 (21.1) | |
| Missing | N = 3 | N = 3 | N = 3 | N = 0 | N = 0 | |
| Household income | .133 | |||||
| < $25 k | 204 (12.4) | 214 (13.0) | 170 (12.4) | 25 (16.3) | 14 (19.5) | |
| $25–49 k | 291 (17.7) | 331 (20.1) | 272 (19.9) | 38 (24.4) | 14 (18.8) | |
| $50–74 k | 376 (22.8) | 305 (18.6) | 264 (19.3) | 26 (16.7) | 9 (11.6) | |
| $75–124 k | 479 (29.1) | 449 (27.3) | 372 (27.2) | 45 (28.9) | 20 (27.3) | |
| $125 k + | 297 (18.0) | 346 (21.0) | 292 (21.3) | 21.2 (13.7) | 17 (22.9) | |
| Year | < .0001 | |||||
| 2009 | 820 (49.8) | 820 (49.8) | 642 (46.9) | 92 (59.4) | 58 (78.7) | |
| 2018 | 827 (50.2) | 826 (50.2) | 728 (53.1) | 63 (40.6) | 16 (21.3) | |
| Sexual repertoire categories (At least once in the past year) | ||||||
| Masturbate alone | 777 (48.1) | 773 (47.8) | 580 (42.6) | 115.3 (75.3) | 55.8 (75.7) | < .0001 |
| Masturbate with partner | 150 (9.3) | 152 (9.4) | 52 (3.8) | 59 (38.1) | 32 (44.4) | < .0001 |
| Gave oral sex | 214 (13.2) | 201 (12.4) | 49 (3.6) | 83 (54.5) | 60 (81.7) | < .0001 |
| Received oral sex | 243 (15.0) | 248 (15.3) | 59 (4.4) | 104 (67.6) | 68 (93.3) | < .0001 |
| Penile-vaginal intercourse | 248 (15.3) | 255 (15.8) | 6 (0.5) | 155 (100.0) | 74 (100.0) | < .0001 |
| Anal intercourse | 38 (2.3) | 50 (3.1) | 3 (0.2) | 20 (13.0) | 22 (29.8) | < .0001 |