| |
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
|
- Missing categories were included in models but coefficients are not shown. HCV, hepatitis C virus; HIV, human immunodeficiency virus; CI, confidence interval; IRR, incidence rate ratio; MSM, men who have sex with men; ART, antiretroviral therapy
