Incident infections | Person years | Rate per 100 person years (95% CI) | Univariate IRR (95% CI) | p | Multivariate IRR (95% CI) | p | |
---|---|---|---|---|---|---|---|
Age | |||||||
Every additional 5 years | 157 | 6279.7 | 2.5 (2.1–2.9) | 0.8 (0.8–0.9) | <0.01 | 0.9 (0.8–0.9) | <0.01 |
Sex | |||||||
Male | 141 | 5772.2 | 2.4 (2.1–2.9) | 1.0 | |||
Female | 16 | 507.5 | 3.2 (1.9–5.1) | 1.3 (0.8–2.2) | 0.33 | ||
Country of birth | |||||||
Australia | 99 | 4316.1 | 2.3 (1.9–2.8) | 1.0 | |||
Other | 58 | 1963.6 | 3.0 (2.3–3.8) | 1.3 (0.9–1.8) | 0.13 | ||
Place of residence | |||||||
Major city | 132 | 3795.0 | 3.5 (2.9–4.1) | 1.0 | 1.0 | ||
Regional/remote | 25 | 2414.6 | 1.0 (0.7–1.5) | 0.3 (0.2–0.5) | <0.01 | 0.3 (0.2–0.5) | <0.01 |
Unknown | 0 | 70.1 | – | – | – | ||
Sexual orientation | |||||||
MSM | 115 | 4950.0 | 2.3 (1.9–2.8) | 0.7 (0.5–1.1) | 0.15 | 0.5 (0.4–0.8) | 0.01 |
Heterosexual male | 26 | 820.5 | 3.2 (2.2–4.7) | 1.0 | 1.0 | ||
Unknown | 16 | 509.1 | 3.1 (1.9–5.1) | – | – | ||
Ever performed sex work | |||||||
No | 151 | 6086.7 | 2.5 (2.1–2.9) | 1.0 | |||
Yes | 6 | 192.9 | 3.1 (1.4–6.9) | 1.3 (0.6–2.8) | 0.59 | ||
Ever injected drugs | |||||||
No | 111 | 5249.1 | 2.1 (1.8–2.5) | 1.0 | 1.0 | ||
Yes | 46 | 795.6 | 5.8 (4.3–7.7) | 2.7 (1.9–3.9) | <0.01 | 2.5 (1.8–3.5) | <0.01 |
Unknown | 0 | 234.9 | – | – | – | ||
Aboriginal or Torres Strait Islander | |||||||
No | 146 | 5992.9 | 2.4 (2.1–2.9) | 1.0 | 1.0 | ||
Yes | 11 | 286.8 | 3.8 (2.1–6.9) | 1.6 (0.9–2.9) | 0.15 | 2.0 (1.1–3.7) | 0.03 |
Current CD4 cell count (cells/mm3) | |||||||
≥ 500 | 34 | 1648.2 | 2.1 (1.5–2.9) | 1.0 | |||
< 500 | 17 | 1116.1 | 1.5 (0.9–2.5) | 0.7 (0.4–1.3) | 0.31 | ||
Unknown | 106 | 3515.4 | 3.0 (2.5–3.6) | – | |||
Current HIV RNA | |||||||
Undetectable | 63 | 2647.6 | 2.4 (1.9–3.0) | 1.0 | |||
Detectable | 21 | 869.0 | 2.4 (1.6–3.7) | 1.0 (0.6–1.7) | 0.95 | ||
Unknown | 73 | 2763.1 | 2.6 (2.1–3.3) | – | |||
Current ART use | |||||||
Yes | 74 | 3008.6 | 2.5 (2.0–3.1) | 1.0 | |||
No | 10 | 508.0 | 2.0 (1.1–3.7) | 0.8 (0.4–1.5) | 0.51 | ||
Unknown | 73 | 2763.1 | 2.6 (2.1–3.3) | – | |||
Current time period | |||||||
2007–09 | 8 | 1027.6 | 0.8 (0.4–1.6) | 1.0 | 1.0 | ||
2010–11 | 21 | 1385.5 | 1.5 (1.0–2.3) | 1.8 (0.8–4.1) | 0.15 | 1.7 (0.8–3.9) | 0.19 |
2012–13 | 77 | 1960.5 | 3.9 (3.1–4.9) | 4.5 (2.2–9.4) | <0.01 | 4.1 (2.0–8.5) | <0.01 |
2014–15 | 51 | 1906.0 | 2.7 (2.0–3.5) | 2.6 (1.2–5.4) | 0.01 | 2.2 (1.1–4.7) | 0.04 |