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Table 2 Factors associated with syphilis and HCV infection among club drug users in Shandong, China

From: Syndemics of syphilis, HCV infection, and methamphetamine use along the east coast of China

Factors Syphilis infection(n=77) HCV infection (n=30) Unprotected sex
% OR(95% CI) AOR(95% CI) % OR(95% CI) AOR(95% CI) % OR(95% CI) AOR(95% CI)
Gender          
 Male 7.9 1.0 1.0 3.9 1.0   37.6 1.0 1.0
 Female 17.5 2.5(1.5-4.2)** 2.8(1.2-6.5)* 2.8 0.7(0.2-2.0)   53.3 3.0(1.8-5.1)** 2.9(1.7-4.9)**
Education          
 Middle school or lower 9.5 1.0   2.9 1.0   58.5 3.7(2.3-5.9)** 3.4(2.0-5.5)**
 High school or higher 9.7 1.0(0.6-1.7)   5.2 1.8(0.9-3.8)   27.4 1.0 1.0
Had ever injected         
 Yes 8.7 0.9(0.4-1.9)   9.8 3.6(1.6-8.1)** 2.7(1.1-6.5)* 44.0 0.8(0.4-1.7)  
 No 9.7 1.0   2.9 1.0 1.0 50.3 1.0  
Had ever sex with regular sex partners in last year       
 Yes 8.8 0.1(0.1-0.6)** 0.2(0.1-0.6)** 3.6      
 No 42.9 1.0   0.0      
Had ever sex with commercial sex partners in last year     
 Yes 11.6 1.7(1.0-2.7)* 2.0(1.0-3.9)* 3.1 0.7 (0.5-1.2)     
 No 7.3 1.0 1.0 4.5 1.0     
Ever received intervention        
 Yes 10.8 1.0   3.8 1.0   34.1 1.0 1.0
 No 9.3 0.9(0.5-1.6)   3.7 1(0.4-2.6)   53.8 2.3(1.4-3.7)** 2.1(1.2-3.6)*
HCV infection          
 Yes 36.7 6.2(2.8-13.6)** 12.1(4.1-20.3)**     42.9 0.9(0.4-1.9)  
 No 8.5 1.0 1.0     45.4 1.0  
Syphilis         
 Yes     14.3 6.2(2.8-13.6)** 8.0(3.5-18.0)** 56.2 3.0(1.8-5.1)** 4.2(2.4-7.4)**
 No     2.6 1.0   27.9 1.0 1.0
  1. OR: Odds ratio; AOR: Adjusted odds ratio, controlled factors included study sites, age, sex, residency, ethnicity, education, marital status, sexual behavior, HIV-related prevention services; CI: Confidence interval; NA: Not applicable; * P < 0.05; ** P < 0.01.