Table 1. Association between incident HIV infection and demographic characteristics, sexual behaviours and STI diagnosis in the last 12 months.
| ^ Characteristics (in the past 12 months) | No. of HIV diagnoses | Person Years | HIV incidence rate per 100 person-years [95% CI] | Rate Ratio [95% CI] | p value |
|---|---|---|---|---|---|
| All | 81 | 6391 | 1.3 [1.0, 1.6] | - | - |
| Age at consultation | |||||
| < 25 | 20 | 1514 | 1.3 [0.8, 2.0] | 1.2 [0.6, 2.4] | 0.24 |
| 25–29 | 25 | 1655 | 1.5 [1.0, 2.2] | 1.4 [0.8, 2.6] | 0.12 |
| 30–34 | 13 | 1070 | 1.2 [0.6, 2.1] | 1.1 [0.5, 2.3] | 0.35 |
| ≥35 | 23 | 2153 | 1.1 [0.7, 1.6] | 1.0 (referent) | - |
| Number of male partners | |||||
| <4 | 14 | 1374 | 1.0 [0.6, 1.7] | 1.0 (referent) | - |
| ≥ 4 | 56 | 4170 | 1.3 [1.0, 1.7] | 1.3 [0.7, 2.6] | 0.18 |
| Condom use during anal sex | |||||
| Consistent | 20 | 2991 | 0.7 [0.4, 1.0] | 1.0 (referent) | - |
| Inconsistent | 60 | 2912 | 2.1 [1.6, 2.7] | 3.1 [1.8, 5.4] | < 0.001 |
| Had sex with female | |||||
| No | 72 | 5603 | 1.3 [1.0, 1.6] | 1.0 (referent) | - |
| Yes | 9 | 720 | 1.2 [0.6, 2.4] | 1.0 [0.4, 2.0] | 0.49 |
| Injecting drug use | |||||
| No | 64 | 5565 | 1.2 [0.9, 1.5] | 1.0 (referent) | - |
| Yes | 7 | 83 | 8.5 [3.4, 17.5] | 7.4 [2.9, 16.1] | < 0. 001 |
| Sex overseas | |||||
| No | 63 | 4638 | 1.4 [1.0, 1.7] | 1.0 (referent) | - |
| Yes | 16 | 1500 | 1.1 [0.6, 1.7] | 0.8 [0.4, 1.4] | 0.20 |
| PEP use | |||||
| No | 33 | 4329 | 0.8 [0.5, 1.1] | 1.0 (referent) | - |
| Yes | 48 | 2062 | 2.3 [1.7, 3.1] | 3.1 [1.9, 4.9] | < 0. 001 |
| Any STI diagnosis* | |||||
| No | 37 | 4390 | 0.8 [0.6, 1.2] | 1.0 (referent) | |
| Yes | 44 | 2000 | 2.2 [1.6, 3.0] | 2.6 [1.7, 4.2] | < 0.001 |
| Gonorrhea | |||||
| Any site | |||||
| Negative | 54 | 5242 | 1.0 [0.8, 1.3] | 1.0 (referent) | - |
| Positive | 27 | 1134 | 2.4 [1.6, 3.5] | 2.3 [1.4, 3.7] | < 0.001 |
| Pharyngeal | |||||
| Negative | 72 | 5891 | 1.2 [1.0, 1.6] | 1.0 (referent) | - |
| Positive | 8 | 448 | 1.8 [0.8, 3.5] | 1.5 [0.6, 3.0] | 0.16 |
| Urethral | |||||
| Negative | 16 | 1471 | 1.1 [0.6, 1.8] | 1.0 (referent) | - |
| Positive | 9 | 469 | 1.9 [0.9, 3.6] | 1.8 [0.7, 4.2] | 0.09 |
| Rectal | |||||
| Negative | 60 | 5450 | 1.1 [0.8, 1.4] | 1.0 (referent) | - |
| Positive | 21 | 614 | 3.4 [2.1, 5.2] | 3.1 [1.8, 5.2] | < 0.001 |
| Chlamydia | |||||
| Any site | |||||
| Negative | 48 | 4795 | 1.0 [0.7, 1.3] | 1.0 (referent) | - |
| Positive | 32 | 1379 | 2.3 [1.6, 3.3] | 2.3 [1.4, 3.7] | < 0.001 |
| Urethral | |||||
| Negative | 41 | 3566 | 1.1 [0.8, 1.6] | 1.0 (referent) | - |
| Positive | 15 | 560 | 2.7 [1.5, 4.4] | 2.3 [1.2, 4.3] | < 0.001 |
| Rectal | |||||
| Negative | 53 | 5010 | 1.1 [0.8, 1.4] | 1.0 (referent) | - |
| Positive | 27 | 1052 | 2.6 [1.7, 3.7] | 2.4 [1.5, 3.9] | < 0.001 |
| Syphilis | |||||
| Negative | 25 | 2021 | 1.2 [0.8, 1.8] | 1.0 (referent) | - |
| Positive | 7 | 301 | 2.3 [0.9, 4.8] | 1.9 [0.7, 4.5] | 0.08 |
^ Of 81 HIV infected individuals, 11 were missing data on number of male partners; 1 was missing data on condom use; 10 were missing data on injecting drug use; 2 were missing data on sex overseas; Gonorrhoea: 1 and 56 were missing data on pharyngeal and urethral respectively; Chlamydia: 25 and 1 were missing data on urethral and rectal respectively; 49 were missing data on syphilis. PEP = post exposure prophylaxis.
* ‘Any STI diagnosis’ includes gonorrhoea at any sites, chlamydia at any sites, and syphilis.