Logistic regression analysis by rectal sexually transmitted infection status
| Crude | Adjusted† | |||||
|---|---|---|---|---|---|---|
| OR | 95% CI | p Value | OR | 95% CI | p Value | |
| Vaginal positive | <0.001** | <0.001** | ||||
| No | Ref | Ref | ||||
| Yes | 33.60 | (12.9 to 87.6) | 37.62 | (11.6 to 122.1) | ||
| Age (year) | 0.92 | (0.86 to 0.98) | 0.02* | 0.95 | (0.88 to 1.02) | 0.17 |
| Race/ethnicity | <0.01** | 0.02* | ||||
| White non-Hispanic | Ref | Ref | ||||
| Black non-Hispanic | 3.53 | (1.4 to 8.8) | 3.14 | (1.25 to 7.91) | ||
| Health insurance | 0.51 | 0.59 | ||||
| No | Ref | Ref | ||||
| Yes | 0.78 | (0.36 to 1.66) | 0.78 | (0.32 to 1.91) | ||
| Eligibility for Medicaid | 0.09 | 0.77 | ||||
| No | Ref | Ref | ||||
| Don't know | 2.52 | (1.06 to 5.98) | 1.41 | (0.53 to 3.73) | ||
| Yes | 2.34 | (0.76 to 7.18) | 1.04 | (0.27 to 4.04) | ||
| Personal income if over 21 years | 0.65 | 0.36 | ||||
| <US$10 000 / year | Ref | Ref | ||||
| >US$10 000 / year | 1.29 | (0.43 to 3.90) | 1.76 | (0.52 to 5.98) | ||
| Household income if under 21 years | 0.21 | 0.12 | ||||
| <US$10 000 / year | Ref | Ref | ||||
| >US$10 000 / year | 2.50 | (0.60 to 10.34) | 4.46 | (0.67 to 29.8) | ||
| Highest level of education if over 24 years | 0.09 | 0.21 | ||||
| High school or less | Ref | Ref | ||||
| More than high school‡ | 0.34 | (0.10 to 1.17) | 0.43 | (0.11 to 1.63) | ||
| Marital status | 0.20 | 0.41 | ||||
| Single | Ref | Ref | ||||
| Currently married | 0.26 | (0.03 to 2.05) | 0.41 | (0.05 to 3.42) | ||
| Any rectal symptoms | 0.81 | 0.70 | ||||
| No | Ref | Ref | ||||
| Yes | 1.11 | (0.47 to 2.64) | 0.82 | (0.31 to 2.20) | ||
| Age at first rectal sex (year) | 0.92 | (0.82 to 1.02) | 0.12 | 0.97 | (0.84 to 1.12) | 0.67 |
| Years since first rectal sex | 0.94 | (0.85 to 1.04) | 0.24 | 1.03 | (0.89 to 1.19) | 0.67 |
| Ever forced rectal sex | 0.92 | 0.91 | ||||
| No | Ref | Ref | ||||
| Yes | 0.92 | (0.19 to 4.44) | 0.90 | (0.17 to 4.71) | ||
| Anal sex in last three months | 0.69 | 0.64 | ||||
| No | Ref | Ref | ||||
| Yes | 1.16 | (0.54 to 2.51) | 1.24 | (0.51 to 2.97) | ||
| Rectal sex frequency if have | 0.95 | 0.85 | ||||
| Some of the time | Ref | Ref | ||||
| Most of the time | 1.08 | (0.28 to 4.20) | 1.55 | (0.34 to 7.01) | ||
| Always | 1.44 | (0.14 to 14.60) | 1.19 | (0.09 to 15.4) | ||
| Anal partners in previous year | 0.31 | 0.11 | ||||
| None | Ref | Ref | ||||
| One | 1.14 | (0.30 to 4.33) | 1.30 | (0.31 to 5.43) | ||
| Two to four | 2.33 | (0.55 to 9.95) | 3.87 | (0.79 to 18.9) | ||
| New anal partner in last three months | 0.61 | 0.73 | ||||
| No | Ref | Ref | ||||
| Yes | 0.74 | (0.23 to 2.34) | 1.25 | (0.36 to 4.34) | ||
| Condoms for rectal sex | 0.97 | 0.62 | ||||
| Never | Ref | Ref | ||||
| Some of the time | 0.79 | (0.26 to 2.45) | 0.59 | (0.16 to 2.12) | ||
| Most of the time | 1.03 | (0.30 to 3.54) | 0.85 | (0.23 to 3.16) | ||
| Always | 1.09 | (0.31 to 3.77) | 0.37 | (0.07 to 1.91) | ||
| Drink before rectal sex | 0.37 | 0.66 | ||||
| No | Ref | Ref | ||||
| Yes | 0.68 | (0.29 to 1.59) | 1.30 | (0.49 to 4.09) | ||
| Partner STD | 0.19 | 0.20 | ||||
| No | Ref | Ref | ||||
| Don't know | 6.89 | (0.87 to 54.7) | 6.67 | (0.80 to 55.8) | ||
| Yes | 6.51 | (0.79 to 53.7) | 6.60 | (0.78 to 56.1) | ||
*p<0.05, logistic regression.
**p<0.01, logistic regression.
†Adjusted for age and race/ethnicity (Black non-Hispanic vs White non-Hispanic).
‡The ‘Community or some college’ and ‘Bachelors or above’ categories, as presented in table 1, were collapsed into a single category for the logistic regressions because ORs could not be constructed for the ‘Bachelors or above’ category, in which there were no cases.
STD, sexually transmitted diseases.