| | Control visits | Case visits | Bivariable model | Multivariable model† | | No. | No. | OR | (95% CI) | aOR | (95% CI) |
| Time-independent factors | | | | | | | Study site | | | | | | | Site 1 | 437 | 65 | Referent | Referent | Site 2 | 185 | 77 | 2.7 | (1.7, 4.2) | 1.9 | (1.2, 3.1) | Site 3 | 271 | 94 | 2.4 | (1.5, 3.7) | 1.7 | (1.0, 2.7) | Site 4 | 372 | 63 | 1.1 | (0.7, 1.7) | 1.5 | (1.0, 2.3) | Age at baseline (in years) | | | | | | | 16–24 | 51 | 7 | 0.9 | (0.3, 2.1) | | | 25–34 | 386 | 106 | 1.4 | (0.9, 2.2) | | | 35–44 | 597 | 139 | 1.1 | (0.7, 1.6) | | | 45+ | 231 | 47 | Referent | | | Race | | | | | | | Black | 568 | 201 | 2.5 | (1.8, 3.5) | 1.9 | (1.3, 2.7) | Other | 697 | 98 | Referent | Referent | Education at baseline | | | | | | | <High school | 367 | 99 | 1.4 | (1.0, 2.1) | | | High school | 436 | 101 | 1.1 | (0.8, 1.6) | | | >High school | 457 | 99 | Referent | | |
| Time-dependent factors | | | | | | Visit (0–15) | | | 0.9 | (0.9, 1.0) | 0.94 | (0.9, 1.0) | Trichomoniasis at preceding visit | | | | | | | Yes | 100 | 60 | 2.1 | (1.4, 3.2) | 1.7 | (1.1, 2.6) | No | 1163 | 239 | Referent | Referent | Vaginal Candidal culture at preceding visit | | | | | | | Yes | 393 | 91 | 1.0 | (0.8, 1.3) | | | No | 864 | 208 | Referent | Human papillomavirus at preceding visit | | | | | | | Yes | 278 | 84 | 1.3 | (0.9, 1.7) | | | No | 975 | 210 | Referent | Spermatozoa detected on Gram stain | | | | | | | Yes | 76 | 43 | 2.3 | (1.6, 3.3) | 1.9 | (1.3, 2.9) | No | 1189 | 256 | Referent | Referent | Sexual behavior during previous 6 months‡ | | | | | | | Frequent coitus, inconsistent condom use | 411 | 139 | 2.3 | (1.6, 3.3) | 1.9 | (1.3, 2.8) | Frequent coitus, consistent condom use | 129 | 35 | 1.8 | (1.1, 2.9) | 1.9 | (1.2, 3.1) | Infrequent coitus, inconsistent condom use | 244 | 49 | 1.4 | (0.9, 2.0) | 1.2 | (0.8, 1.8) | Infrequent coitus, consistent condom use | 138 | 23 | 1.1 | (0.6, 1.9) | 1.1 | (0.6, 2.0) | Not sexually active | 341 | 52 | Referent | Referent | Female sex partner during previous 6 months | | | | | | | Yes | 92 | 25 | 1.2 | (0.7, 1.8) | | | No | 1169 | 272 | Referent | | | Douching within 48 hours | | | | | | | Yes | 44 | 13 | 1.1 | (0.6, 2.0) | | | No | 1215 | 285 | Referent | | | Current hormonal contraception use | | | | | | | Yes | 92 | 9 | 0.4 | (0.2, 0.9) | 0.4 | (0.2, 0.8) | No | 1171 | 289 | Referent | Referent | Current injection drug use | | | | | | | Yes | 160 | 58 | 1.5 | (1.0, 2.2) | | | No | 1104 | 241 | Referent | | | Crack use during previous 6 months | | | | | | | Yes | 139 | 66 | 2.0 | (1.3, 2.9) | | | No | 1125 | 233 | Referent | | | Cigarette use during previous 6 months | | | | | | | Yes | 837 | 230 | 1.7 | (1.2, 2.4) | 1.5 | (1.0, 2.1) | No | 427 | 69 | Referent | Referent |
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