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Table 3 Factors associated with syphilis infection among 3717 Chinese MSM

From: Commercial sex and risk of HIV, syphilis, and herpes simplex virus-2 among men who have sex with men in six Chinese cities

Characteristic No. of MSM syphilis positive (%) Crude OR (95% CI) P-value AOR (95% CI) P-value
Commercial sex
 NC-MSM 302 (8.7) Ref. 0.28 Ref. 0.262
 MSM-buying 7 (6.8) 0.8 (0.4–1.7)   0.5 (0.2–1.4)  
 MSM-selling 18 (12.1) 1.4 (0.9–2.4)   1.5 (0.7–3.3)  
HIV positive
 No 249 (7.5) Ref. <0.001 Ref. <0.001
 Yes 78 (19.0) 2.9 (2.2–3.8)   2.0 (1.5–2.8)  
HSV-2 positive
 No 208 (7.0) Ref. <0.001 Ref. <0.001
 Yes 81 (19.8) 3.3 (2.5–4.4)   2.7 (2.0–3.7)  
Age (per year)   1.0 (1.0–1.1) 0.001 1.0 (1.0–1.1) 0.002
Married to a woman
 No 222 (7.9) Ref. <0.001 Ref. 0.45
 Yes 105 (11.8) 1.6 (1.2–2.0)   0.9 (0.6–1.2)  
Time living in the study city
 >6 months 244 (8.7) Ref. 0.31 _ _
 ≤6 months 18 (6.9) 0.8 (0.5–1.3)    
Student
 No 305 (9.6) Ref. <0.001 Ref. 0.170
 Yes 22 (4) 0.4 (0.3–0.6)   0.7 (0.4–1.2)  
Education
 College or above 145 (6.8) Ref. <0.001 Ref. 0.080
 High school or below 182 (11.5) 1.8 (1.4–2.2)   1.3 (1.0–1.7)  
Seeking partners online
 No 135 (11.7) Ref. <0.001 Ref. 0.082
 Yes 190 (7.4) 0.6 (0.5–0.8)   0.8 (0.6–1.0)  
Number of male sex partners in past 6 months
 0–2 175 (7.6) Ref. 0.002 Ref. 0.002
 3–9 113 (10.7) 1.5 (1.1–1.9)   1.5 (1.1–1.9)  
 ≥10 35 (11.9) 1.7 (1.1–2.4)   1.5 (1.0–2.5)  
Drug use in past 6 months
 No 182 (7.8) Ref. 0.024 Ref. 0.007
 Yes 91 (10.3) 1.4 (1.0–1.8)   1.5 (1.1–2.0)  
UAI in past 6 months
 No 102 (7.3) Ref. 0.013 Ref. 0.038
 Yes 225 (9.7) 1.4 (1.1–1.7)   1.3 (1.0–1.8)  
Predominant position in anal sex
 Receptive 265 (12.8) Ref. 0.23 _ _
 Insertive 139 (9.0) 0.9 (0.7–1.1)