Table 2. HIV risk indicators* at screening by incident pregnancy.
| Column % (n) | Rate per 100 woman yrs (No. pregnancies/woman yrs) | Unadjusted Rate Ratio (95% CI) | P-value | |
| Overall pregnancy incidence | (352) | 9.6 (48/501) | – | – |
| Marijuana, heavy drinking Λ and/or use of these during sex | ||||
| ≥ 2 such activities | 9.9 (35) | 18.3 (9/49) | 2.02 (0.96–4.23) | 0.15 |
| 1 such activity | 18.2 (64)Λ | 7.1 (7/99) | 0.80 (0.35–1.81) | |
| None | 71.9 (253) | 9.1 (32/253) | 1 | |
| Diagnosed with sexually transmitted infection | ||||
| Yes | 5.1 (18) | 20.8 (5/24) | 2.38 (0.94–6.01) | 0.10 |
| No | 95.9 (334) | 9.0 (43/477) | 1 | |
| Type of sex partner(s) | ||||
| No partner | 14.2 (50) | 10.5 (7/67) | 1.13 (0.50–2.56) | 0.99 |
| Causal only | 2.3 (8) | 10.3 (1/10 | 1.12 (0.15–8.19) | |
| Main partner only | 74.4 (262) | 9.3 (35/375) | 1 | |
| Main & casual partners | 9.1 (32) | 10.0 (5/50) | 1.07 (0.42–2.74) | |
| Main sex partner >10 yrs older | ||||
| Yes | 8.8 (26) | 7.8 (3/38) | 0.79 (0.24–2.57) | 0.68 |
| No | 91.2 (268) | 9.6 (37/386) | 1 | |
| Living situation with main partner | ||||
| Lives with main partner | 45.5 (160) | 9.0 (21/233) | 1 | 0.92 |
| Does not live with main partner | 38.1 (134) | 9.9 (19/192) | 1.09 (0.59–2.03) | |
| No main partner | 16.5 (58) | 10.5 (8/76) | 1.17 (0.52–2.64) | |
| Number of sexual partners | ||||
| ≥2 partners | 15.6 (55) | 11.5 (9/78) | 1.25 (0.60–2.58) | 0.56 |
| 1 partner | 84.4 (297) | 9.2 (39/423) | 1 | |
| Has partner of unknown HIV status | ||||
| ≥1 partner(s)& | 48.9 (172) | 8.4 (20/239) | 0.78 (0.44–1.38) | 0.39 |
| No such partners (knows status) | 51.1 (180) | 10.7 (28/262) | 1 | |
| Partner type by knowledge of HIV Status ** | ||||
| >2 partners varied knowledge | 9.5 (33) | 6.2 (3/48) | 1.04 (0.29–3.72) | 0.05 |
| 2 partners both unknown status | 6.3 (22) | 20.0 (6/30) | 3.42 (1.26–9.25) | |
| 1 partner known negative | 46.4 (162) | 12.0 (28/234) | 2.03 (1.01–4.07) | |
| 1 partner unknown status | 37.8 (132) | 6.0 (11/184) | 1 | |
*
Refers to six months prior to screening interview.
Λ
Heavy drinking defined as 5 or more alcoholic drinks in one day; 81% (52/64) of these women were heavy drinkers.
&
Includes women with partners where HIV status was either all unknown, or status known for 1 of multiple partners.
**
Excludes 3 women with known HIV-positive partners as data too scant for a separate stratum. No pregnancies occurred among these women.