Table 1.
Logistic regression models for association of risk factors with STI prevalence
| Variable | N with STI/ total N (STI prevalence) | Univariable | Multivariable 1 (N = 957) | Multivariable 2 (N = 957) | ||||
|---|---|---|---|---|---|---|---|---|
| OR (95% CI) | p | OR | p | OR | p | |||
| Age group | 16–19 | 61/419 (14.6) | 1 | 0.042 | 1 | 0.95 | ||
| 20–25 | 114/584 (19.5) | 1.42 (1.01, 2.00) | 1.01 (0.68, 1.51) | |||||
| Sex | Male | 23/214 (10.8) | 1 | 0.004 | 1 | 0.001 | 1 | 0.001 |
| Female | 152/789 (19.3) | 1.98 (1.24, 3.16) | 2.77 (1.54, 4.98) | 2.64 (1.52, 4.57) | ||||
| Relationship status | Single | 21/177 (11.9) | 0.65 (0.39, 1.10) | 0.005 | 1.48 (0.72, 3.04) | 0.02 | 1.23 (0.67–2.27) | 0.007 |
| Boyfriend/girlfriend | 70/368 (19.0) | 1.14 (0.80, 1.64) | 1.82 (1.05, 3.12) | 1.70 (1.09–2.63) | ||||
| Married | 74/434 (17.1) | 1 | 1 | 1 | ||||
| Divorced/widowed | 10/24 (41.7) | 3.47 (1.49, 8.12) | 4.10 (1.50, 11.25) | 3.71 (1.51–9.06) | ||||
| New partner in the last 3 months | Yes | 35/157 (22.3) | 1.45 (0.95, 2.20) | 0.083 | 0.69 (0.36, 1.30) | 0.25 | ||
| No | 129/846 (16.6) | 1 | 1 | |||||
| No of sexual partners in last 3 months | 0 | 31/293 (10.6) | 1 | < 0.001 | 1 | 0.16 | ||
| 1 | 119/623 (19.1) | 2.00 (1.31, 3.04) | 1.07 (0.54, 2.12) | |||||
| 2+ | 25/87 (28.7) | 3.41 (1.88, 6.18) | 2.09 (0.83, 5.25) | |||||
| No of lifetime partners | 0 | 11/186 (5.9) | 1 | 1 | 0.004 | 1 | ||
| 1 | 54/388 (13.9) | 2.57 (1.31, 5.04) | < 0.001 | 2.19 (0.85, 5.64) | 2.09 (0.98, 4.44) | < 0.001 | ||
| 2 + | 110/429 (25.6) | 5.49 (2.87, 10.47) | 3.89 (1.47, 10.29) | 3.98 (1.93, 8.19) | ||||
| History of STI treatment | Yes | 22/79 (27.9) | 1.94 (1.15, 3.28) | 0.012 | 0.75 (0.40, 1.40) | 0.36 | ||
| No | 153/924 (16.6) | 1 | 1 | |||||
| Partner ever had an STI | Yes | 17/43 (39.5) | 3.32 (1.76,6.26) | < 0.001 | 1.90 (0.88, 4.07) | 0.10 | ||
| No | 158/960 (16.5) | 1 | 1 | |||||
| HIV status (N = 957) | Positive | 18/50 (36.0) | 2.79 (1.53, 5.11) | < 0.001 | 2.05 (1.05, 4.01) | 0.04 | 1.95 (1.02, 3.72) | 0.04 |
| Negative | 152/907 (16.8) | 1 | 1 | 1 | ||||
| Use of condoms (N = 817) | Always | 15/116 (12.9) | 0.70 (0.38, 1.28) | 0.004 | 0.65 (0.32, 1.35) | 0.12 | ||
| Sometimes | 82/319 (25.7) | 1.63 (1.13, 2.34) | 1.27 (0.81, 1.99) | |||||
| Never | 67/382 (17.5) | 1 | 1 | |||||
| Perceived STI risk | None/low | 93/721 (12.9) | 1 | < 0.001 | 1 | 0.01 | 1 | < 0.001 |
| Medium/high | 82/282 (29.1) | 2.77 (1.98, 3.88) | 1.67 (1.12, 2.49) | 1.98 (1.37, 2.87) | ||||
| Use of hormonal contraception (N = 789) | Yes | 87/451 (19.3) | 1.00 (0.70, 1.44) | 0.98 | ||||
| No | 65/338 (19.2) | 1 | ||||||
| Past or current pregnancy (N = 789) | Yes | 13/36 (36.1) | 2.50 (1.23, 5.05) | 0.011 | 2.70 (1.27, 5.78) | 0.01 | 2.55 (1.21, 5.39) | 0.014 |
| No | 139/753 (18.5) | 1 | 1 | 1 | ||||
Multivariable Model 1: includes all potential risk factors and Multivariable Model 2: includes potential risk factors that were associated with STI infection in Model 1 ( female gender, relationship status, number of lifetime sexual partners, HIV status, perceived STI risk and past/current pregnancy)