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Table 2 Association of sociodemographic factors, clinical parameters and sexual behaviour with syphilis infection among 1223 drug addicts

From: Prevalence and risk factors of syphilis infection among drug addicts

  Syphilis infection (positive for TPHA)
  OR* 95%CI p-value
Gender    
Male 1 [reference group] <0.00
Female 4.56 [2.37–8.78]  
Age groups    
below 21 y 1 [reference group]  
21–30 y 0.59 [0.19–1.85] 0.363
31–40 y 0.59 [0.18–1.94] 0.383
over 40 y 1.94 [0.56–6.71] 0.295
Illicit drug abuse    
no or <2 y 1 [reference group]  
2 to 4 y 0.89 [0.23–3.53] 0.872
5–7 y 1.88 [0.52–6.79] 0.334
>7 y 0.96 [0.32–2.92] 0.945
Migration background    
native German 1 [reference group]  
Migrants 1.51 [0.63–3.62] 0.36
Stable partnership    
> 5 years 1 [reference group]  
1 to 5 years 1.17 [0.46–2.97] 0.94
<1 year 1.04 [0.35–3.16] 0.74
Number of sexual partners in the last 5 years    
0–1 1 [reference group]  
2–5 1.71 [0.57–5.17] 0.34
6–20 0.69 [0.13–3.67] 0.67
> 20 5.85 [2.07–16.5] 0.00
Sex for drugs/money    
never 1 [reference group]  
frequent 8.81 [3.66–21.19] 0.00
Sex on the first day of meeting a partner    
never 1 [reference group]  
seldom 1.31 [0.44–3.9] 0.63
frequent 4.98 [2.22–11.19] 0.00
  1. OR denotes Odds ratio; CI denotes confidence interval; *adjusted for sex and age (where appropriate)