| Factors | n | Incidence (Rate %) | IRR (95% CI) | P-Value | aIRR (95% CI) | P-Value |
| Age | ||||||
| 18 - 25 years | 88 | 7 (8.0) | 8.19 (1.03 - 65.32) | 0.025 | 5.57 (0.89 - 34.64) | 0.066 |
| 26 - 47 years | 103 | 1 (1.0) | Reference | |||
| Marital status | ||||||
| Single | 45 | 5 (11.1) | 5.41 (1.34 - 21.75) | 0.019 | 8.32 (1.27 - 54.67) | 0.027 |
| Ever married | 146 | 3 (2.1) | Reference | |||
| Circumcised | ||||||
| Yes | 51 | 1 (2.0) | 0.39 (0.05 - 3.11) | 0.092 | 0.99 (0.09 - 10.68) | 0.991 |
| No | 140 | 7 (5.0) | Reference | |||
| Sexual partners in 6 months | ||||||
| ≤1 partner | 94 | 4 (4.3) | 0.95 (0.24 - 3.68) | 1.00 | Not included | - |
| >1 partners | 93 | 4 (4.3) | Reference | |||
| Sexual partners in 12 months | ||||||
| ≤1 partner | 70 | 1 (1.4) | 0.25 (0.03 - 1.97) | 0.102 | 0.87 (0.07 - 10.92) | 0.913 |
| >1partners | 121 | 7 (5.8) | Reference | |||
| Sexual partners in lifetime | ||||||
| ≤5 partners | 78 | 1 (1.3) | 0.21 (0.03 - 1.65) | 0.101 | 0.65 (0.05 - 8.93) | 0.747 |
| >5 partners | 113 | 7 (6.2) | Reference | |||
| Commercial sex | ||||||
| No | 25 | 0 (0.0) | 0.00 (0.00 - 4.58) | 0.600 | Not included | - |
| Yes | 166 | 8 (4.8) | Reference | |||
| Most recent sexual partner | ||||||
| Wife/regular girlfriend | 139 | 1 (0.7) | 0.05 (0.00 - 0.39) | 0.001 | 0.03 (0.01 - 0.35) | 0.004 |
| Casual partner/Sex worker | 53 | 7 (13.2) | Reference | |||
| Condom use on last sexual act | ||||||
| No | 162 | 7 (4.3) | 1.25 (0.16 - 9.81) | 1.000 | Not included | - |
| Yes | 29 | 1 (3.4) | Reference | |||
| Condom use with regular partner | ||||||
| ≥ 50% of the time | 14 | 0 (0.0) | 0.00 (0.00 - 9.17) | 1.000 | Not included | - |
| < 50% of the time | 177 | 8 (4.5) | Reference | |||
| Condom use with new partner | ||||||
| ≥50% of the time | 108 | 1 (0.9) | 0.10 (0.00 - 0.85) | 0.022 | 0.08 (0.01 - 0.89) | 0.039 |
| <50% of the time | 83 | 7 (8.4) | Reference | |||
| Ever use of Condom | ||||||
| Ever used condom | 164 | 8 (4.9) | Reference | |||
| Never used condom | 27 | 0 (0.0) | 0.00 (0.00 - 4.17) | 0.603 | Not included | - |
| History of STI | ||||||
| No | 157 | 5 (3.2) | Reference | |||
| Yes | 33 | 3 (9.1) | 3.04 (0.54 -15.74) | 0.104 | 2.10 (0.28 - 15.84) | 0.470 |
| Baseline HSV-2 | ||||||
| Negative | 94 | 5 (5.3) | 0.57 (0.10 - 2.83) | 0.493 | Not included | - |
| Positive | 97 | 3 (3.1) | Reference | |||
| Baseline HPV | ||||||
| Negative | 106 | 3 (2.8) | Reference | |||
| Positive | 85 | 5 (5.9) | 2.15 (0.43 - 11.73) | 0.470 | Not included | - |