Table 3 Logistic regression analyses of factors associated with HIV and syphilis co-infection (compared with the mono-infected individuals)

<25

9 (22.5)

31 (77.5)

1

1

≥25

61 (34.3)

117 (65.7)

1.80 (0.80–4.01)

2.15 (0.85–5.44)

Han

64 (31.5)

139 (68.5)

1

1

Other minorities

6 (40.0)

9 (60.0)

1.45 (0.49–4.24)

1.29 (0.38–4.32)

Married

13 (23.6)

42 (76.4)

1

1

Unmarried

57 (35.0)

106 (65.0)

1.74 (0.86–3.50)

2.47 (1.03–5.89)*

≤Junior middle school

24 (31.6)

52 (68.4)

1

1

>Junior middle school

46 (32.4)

96 (67.6)

1.04 (0.57–1.89)

1.17 (0.59–2.35)

Yes

8 (38.1)

13 (61.9)

1

1

No

62 (31.5)

135 (68.5)

0.75 (0.29–1.89)

0.72 (0.25–2.09)

≤3000

32 (33.0)

65 (67.0)

1

1

3001–5000

22 (31.4)

48 (68.6)

0.93 (0.48–1.80)

1.00 (0.47–2.13)

>5000

16 (31.4)

35 (68.6)

0.93 (0.45–1.92)

0.79 (0.33–1.93)

>2

14 (20.9)

53 (79.1)

1

1

1–2

11 (39.3)

17 (60.7)

2.45 (0.94–6.40)

1.66 (0.56–4.97)

<1

45 (36.6)

78 (63.4)

2.18 (1.09–4.37)*

1.34 (0.58–3.09)

Yes

48 (33.8)

94 (66.2)

1

1

No

22 (28.9)

54 (71.1)

0.80 (0.44–1.46)

0.55 (0.26–1.19)

≥18

50 (29.9)

117 (70.1)

1

1

<18

20 (39.2)

31 (60.8)

1.51 (0.79–2.89)

1.50 (0.69–3.25)

Yes

53 (35.6)

96 (64.4)

1

1

No

17 (24.6)

52 (75.4)

0.59 (0.31–1.13)

0.63 (0.30–1.35)

≤2

22 (27.5)

58 (72.5)

1

1

3–5

29 (41.4)

41 (58.6)

1.87 (0.94–3.69)

2.03 (0.86–4.77)

>5

19 (27.9)

49 (72.1)

1.02 (0.50–2.10)

0.92 (0.37–2.28)

Insertive

13 (20.6)

50 (79.4)

1

1

Receptive

29 (39.2)

45 (60.8)

2.48 (1.15–5.34)*

2.44 (1.04–5.73)*

Both

26 (34.2)

50 (65.8)

2.00 (0.92–4.33)

2.40 (0.99 –5.79)

Yes

19 (28.8)

47 (71.2)

1

1

No

48 (35.0)

89 (65.0)

1.33 (0.71–2.53)

1.19 (0.55–2.57)

<6

50 (31.6)

108 (68.4)

1

1

≥6

20 (33.3)

40 (66.7)

1.12 (0.63–1.81)

1.18 (0.59–2.35)