Table 1.
Distribution of socio-demographic characteristics, sexual practices, and vaccination dose
| Complete cases N (%) | % Missing | Multiple imputation† N (%) | |
|---|---|---|---|
| Age category (N=742) | |||
| 12-15 | 57 (7.7) | 57 (7.7) | |
| 16-17 | 232 (31.1) | 0.4 | 234 (31.4) |
| 18-19 | 453 (60.8) | 454 (61.0) | |
| Ethnicity (N=736) | |||
| Hispanic | 448 (60.8) | 453 (60.8) | |
| Black or African-American | 255 (34.7) | 1.2 | 258 (34.6) |
| Other (Asian, White, Other) | 33 (4.5) | 34 (4.6) | |
| Age at sexual debut (N=732) | |||
| <14 | 119 (16.0) | 1.7 | 122(16.3) |
| 14-15 | 348 (47.5) | 355 (47.6) | |
| 16-17 | 231 (31.6) | 235 (31.5) | |
| 18-19 | 34 (4.6) | 34 (4.6) | |
| Recent use of condoms (N=727) | |||
| Never | 88(12.1) | 2.4 | 90(12.1) |
| Rarely/sometimes | 269(37.0) | 275(36.9) | |
| Most of the time | 227(31.2) | 233 (31.2) | |
| Always | 143(19.7) | 148(19.8) | |
| Use of oral contraceptive pill (N=717) | |||
| Never used | 465(64.9) | 3.7 | 483(64.8) |
| Rarely/sometimes | 111(15.5) | 117(15.7) | |
| Most/all of the time | 141(19.7) | 145 (19.5) | |
| History of sexually transmitted infections* | |||
| None | 385/680 (56.6) | 7.3 | 325(43.6) |
| Chlamydia | 233/713 (32.7) | 4.3 | 245(32.8) |
| Trichomoniasis | 42/705 (6.0) | 5.4 | 45(6.0) |
| Gonorrhea | 34/701(4.9) | 5.9 | 36(4.9) |
| Genital warts | 27/699 (3.9) | 6.2 | 28(3.8) |
| Bacterial vaginosis | 120/696 (17.2) | 6.6 | 130(17.5) |
| History of cigarette smoking (N=727) | |||
| Never | 428(58.9) | 439 (58.9) | |
| Yes; no longer | 191(26.3) | 2.4 | 194(26.0) |
| Yes; current | 108(14.9) | 113(15.1) | |
| Vaccination dose at enrollment (N=745) | |||
| Unvaccinated (0 doses) | 144 (19.3) | 0 | 144(19.3) |
| Partial (1-2 doses) | 211(28.3) | 211(28.3) | |
| Full (3-doses) | 390 (52.4) | 390(52.3) | |
| Cervical HPV DNA types | |||
| Any type | 377/729 (51.7) | 2.2 | 385(51.7) |
| High risk-types | 210/729 (28.8) | 2.2 | 214(28.7) |
| HPV4 vaccine-types | 44/729 (6.04) | 2.2 | 45(6.0) |