Table 3.
Risk factors for STI acquisition during study follow-up.
| STI incidence | ||||
|---|---|---|---|---|
| Unadjusted HR (95% CI) | P value | Adjusteda HR (95% CI) | P value | |
| Age | ||||
| <23 years | 1.36 (1.09, 1.71) | 0.007 | 1.50 (1.17, 1.93) | 0.001 |
| 23–27 years | 0.95 (0.72, 1.26) | 0.720 | 1.07 (0.80, 1.44) | 0.628 |
| 28–32 years | 0.84 (0.63, 1.10) | 0.191 | 0.83 (0.63, 1.10) | 0.197 |
| 38+ years | 1 | 1 | ||
| Previous STI diagnosis | ||||
| Chlamydia | 1.77 (1.35, 2.31) | 0.000 | 1.77 (1.32, 2.35) | 0.000 |
| Gonorrhea | 1.49 (0.92, 2.43) | 0.104 | 1.19 (0.72, 1.98) | 0.500 |
| Trichomonas | 1.89 (1.43, 2.50) | 0.000 | 1.58 (1.20, 2.10) | 0.001 |
| T. pallidum | 4.67 (3.37, 6.46) | 0.000 | 5.13 (3.65. 7.22) | 0.000 |
| Education | ||||
| Low education | 1.27 (1.00, 1.60) | 0.044 | 1.30 (1.02, 1.66) | 0.034 |
CI: confidence interval; HR: hazard ratio.