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Table 2 Logistic regression analyses of factors associated with HIV and syphilis co-infection (compared with the non-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 Non-infected group
Age (year)
  <25 9 (14.5) 53 (85.5) 1 1
≥25 61 (18.9) 262 (81.1) 1.37 (0.64–2.93) 1.82 (0.71–4.64)
Ethnicity
  Han 64 (17.8) 296 (82.2) 1 1
Other minorities 6 (24.0) 19 (76.0) 1.46 (0.56–3.80) 2.00 (0.65–6.15)
Marital status
  Married 13 (14.9) 74 (85.1) 1 1
Unmarried 57 (19.1) 241 (80.9) 1.35 (0.70–2.59) 1.64 (0.69–3.89)
Educational level
  ≤Junior middle school 24 (22.2) 84 (77.8) 1 1
>Junior middle school 46 (16.6) 231 (83.4) 0.69 (0.40–1.21) 0.91 (0.47–1.79)
Socioeconomic Disconnection
  Yes 8 (20.5) 31 (79.5) 1 1
No 62 (17.9) 284 (82.1) 0.85 (0.37–1.93) 0.94 (0.35–2.52)
Monthly income (RMB)
  ≤3000 32 (21.9) 114 (78.1) 1  
3001–5000 22 (16.3) 113 (83.7) 0.69 (0.38–1.27) 0.62 (0.30–1.28)
>5000 16 (15.4) 88 (84.6) 0.65 (0.33–1.26) 0.61 (0.26–1.40)
Length of stay in Shenzhen (year)
  >2 14 (10.8) 116 (89.2) 1 1
1–2 11 (19.6) 45 (80.4) 2.03 (0.86–4.79) 2.34 (0.81–6.78)
<1 45 (22.6) 154 (77.4) 2.42 (1.27–4.62)* 2.80 (1.30–6.05)*
Having vaginal sexual intercourse
  Yes 48 (18.5) 212 (81.5) 1 1
No 22 (17.6) 103 (82.4) 0.94 (0.54–1.65) 0.83 (0.41–1.68)
Age at first anal sexual intercourse (year)
  ≥18 50 (15.5) 272 (84.5) 1 1
<18 20 (31.7) 43 (68.3) 2.53 (1.38–4.66)* 2.78 (1.29–5.89)*
Having a fixed homosexual partner
  Yes 53 (19.5) 219 (80.5) 1 1
No 17 (15.0) 96 (85.0) 0.73 (0.40–1.33) 0.74 (0.35–1.54)
Number of anal sexual partners in the past six months
  ≤2 22 (13.8) 137 (86.2) 1 1
3–5 29 (26.6) 80 (73.4) 2.26 (1.21–4.19)* 2.54 (1.19–5.40)*
>5 19 (16.2) 98 (83.8) 1.21 (0.62–2.35) 1.17 (0.52–2.61)
Roles in anal sexual intercourse
  Insertive 13 (8.0) 149 (92.0) 1 1
Receptive 29 (37.2) 49 (62.8) 6.78 (3.27–14.07)* 6.87 (3.02–15.61)*
Both 26 (19.8) 105 (80.2) 2.84 (1.39–5.78)* 3.65 (1.64–8.09)*
Always using condom in anal sexual intercourse in the past six months
  Yes 19 (11.4) 148 (88.6) 1 1
No 48 (24.0) 152 (76.0) 2.46 (1.38–4.38)* 2.13 (1.08–4.19)*
HIV–related knowledge
  <6 50 (18.5) 220 (81.5) 1 1
≥6 20 (17.4) 95 (82.6) 0.92 (0.52–1.84) 0.91 (0.47–1.79)
  1. *P < 0.05