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

From: Prevalence of HIV and syphilis co-infection and associated factors among non-commercial men who have sex with men attending a sexually transmitted disease clinic in Shenzhen, China

Variable Category HIV and syphilis infection (%) Crude OR (95% CI) Adjusted OR (95% CI)
Co-infected group Mono-infected group
Age (year)
  <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)
Ethnicity
  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)
Marital status
  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)*
Educational level
  ≤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)
Socioeconomic Disconnection
  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)
Monthly income (RMB)
  ≤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)
Length of stay in Shenzhen (year)
  >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)
Having vaginal sexual intercourse
  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)
Age at first anal sexual intercourse (year)
  ≥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)
Having a fixed homosexual partner
  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)
Number of anal sexual partners in the past six months
  ≤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)
Roles in anal sexual intercourse
  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)
Always using condom in anal sexual intercourse in the past six months
  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)
HIV–related knowledge
  <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)
  1. *P < 0.05