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Table 2 Demographic and behavioral factors associated with HIV acquisition among participants in two Chinese cities

From: HIV incidence and risk factors among transgender women and cisgender men who have sex with men in two cities of China: a prospective cohort study

Factors

n

Person-years

HIV positive (n)

HIV rate per 100 person-years (95% CI)

HR (95% CI)

P

aHR (95% CI)

P

City

 Tianjin

639

763.31

15

1.97 (1.1–3.24)

1

   

 Shanghai

417

497.27

18

3.62 (2.15–5.73)

1.77 (0.89–3.52)

0.10

  

Population type

 Transgender women

439

519.92

23

4.42 (2.8–6.62)

3.27 (1.55–6.87)

0.00

3.06 (1.46, 6.45)

0.003

 Cisgender MSM

617

740.65

10

1.35 (0.65–2.48)

1

 

1

 

Age (years)

  ≤ 24

273

364.52

12

3.29 (1.7–5.73)

1

   

 25–29

385

456.66

5

1.09 (0.35–2.55)

0.31 (0.11–0.87)

0.03

  

  ≥ 30

398

471

16

3.40 (1.94–5.51)

0.97 (0.46–2.04)

0.93

  

Local residence time (years)

  > 2

675

800.26

14

1.75 (0.96–2.93)

1

   

  ≤ 2

381

460.31

19

4.13 (2.47–6.44)

1.53 (1.08–2.154)

0.02

  

Marital status

 Single

739

871.2

21

2.41 (1.49–3.68)

1

   

 Married/cohabiting

177

213.83

7

3.27 (1.32–6.73)

1.34 (0.57–3.14)

0.51

  

 Divorced/widowed

140

207.15

5

2.41 (0.78–5.63)

1.11 (0.42–2.94)

0.84

  

Education (years)

  ≤ 9

90

104.35

3

2.87 (0.59–8.39)

1

   

 10–12

262

316.79

9

2.84 (1.3–5.37)

1.01 (0.27–3.72)

0.99

  

  ≥ 13

704

871.04

21

2.41 (1.49–3.68)

0.84 (0.25–2.81)

0.77

  

Work status

 Unemployed

72

84.74

2

2.36 (0.28–8.5)

1

   

 Student

103

130.71

3

2.30 (0.47–6.7)

0.91 (0.15–5.45)

0.92

  

 Full-time job

350

463.8

16

3.45 (1.97–5.6)

1.46 (0.34–6.36)

0.62

  

 Part-time job

531

612.93

12

1.96 (1.01–3.41)

0.83 (0.19–3.69)

0.80

  

Average monthly income (RMB)

  < 1000

293

358.39

5

1.40 (0.45–3.25)

1

   

 1000–5000

412

480.47

17

3.54 (2.06–5.68)

2.61 (0.96–7.07)

0.06

  

  > 5000

351

453.33

11

2.43 (1.21–4.35)

1.79 (0.62–5.15)

0.28

  

Sex orientation

 Gay

883

1097.48

23

2.10 (1.32–3.14)

1

   

 Heterosexual & others

62

76.24

3

3.94 (0.81–11.48)

1.84 (0.55–6.15)

0.32

  

 Bisexual

111

86.85

7

8.06 (3.25–16.57)

6.03 (2.48–14.66)

0.00

  

Age of sexual debut (years)

  < 18

237

299.47

6

2.00 (0.73–4.34)

0.69 (0.28–1.66)

0.41

  

  ≥ 18

819

992.71

27

2.72 (1.79–3.96)

1

   

Frequency of anal sex (past 1 m)a

  < 3

666

826.3

14

1.69 (0.93–2.83)

1

   

  ≥ 3

390

465.89

19

4.08 (2.44–6.36)

2.28 (1.14–4.55)

0.02

  

Unprotected anal sex last timea

 Yes

163

182.84

16

8.75 (4.99–14.21)

5.79 (2.92–11.47)

0.00

5.53 (2.78, 10.99)

0.000

 No

893

1077.73

17

1.58 (0.92–2.53)

1

 

1

 

Group sex (past 3 m)a

 Yes

48

59.02

4

6.78 (1.86–17.34)

1

   

 No

1008

1233.16

29

2.35 (1.57–3.38)

0.37 (0.13–1.06)

0.06

  

Stable partner (past 3 m)a

 Yes

512

649.75

15

2.31 (1.29–3.81)

1

   

 No

544

642.43

18

2.80 (1.66–4.43)

1.20 (0.6–2.38)

0.61

  

Casual partner (past 3 m)a

 Yes

695

835.72

23

2.75 (1.74–4.12)

1

   

 No

361

456.46

10

2.19 (1.05–4.02)

0.81 (0.39–1.71)

0.58

  

Self-reported sexually transmitted infections (past 6 m)a

 No

991

1178.87

30

3.03 (1.72–3.64)

1

   

 Yes

65

81.71

3

4.62 (0.75, 10.71)

1.39 (0.42–4.55)

0.51

  

Discrimination-related experience at all settings (past 6 m)a

 Yes

655

776.8

26

3.35 (2.18–4.91)

2.68 (1.16–6.17)

0.02

  

 No

401

515.38

7

1.36 (0.55–2.79)

1

   
  1. HR, Hazard ratio; aHR, Adjusted hazard ratio; CI, Confidence interval; aTime-dependent variables