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Table 1 Sero-prevalence of syphilis antibodies (according to TPHA-Test) among inpatient drug addicts by gender, sociodemographic factors and sexual behaviour

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

  Male Female
  N with test % with reactive TPHA -Test P N with test % with reactive TPHA -Test p 1
Overall 890 1.9   259 8.5  
Age groups    0.55    0.05
below 21 years 56 1.8   23 13.0  
21–30 years 406 1.7   128 6.3  
31–40 years 356 1.7   80 6.3  
over 40 years 72 4.2   28 21.4  
Illicit drug abuse    0.28    0.13
no or <2 y 91 4.4   33 0  
2 to 4 y 193 1.0   45 6.7  
5–7 y 106 1.9   31 16.1  
>7 y 500 1.8   150 9.3  
Migration background    0.184    0.374
Native German 694 1.6   233 9.0  
Migrants 196 3.1   26 3.8  
Stable partnership    0.60    0.60
no or <1 year 558 1.8   142 9.9  
1 to 4 years 171 1.2   72 8.3  
≥ 5 years 150 2.7   41 4.9  
Number of sexual partners in the last 5 years    0.61    0.00
0–1 247 1.6   49 2.0  
2–5 315 2.2   86 3.5  
6–20 192 1.0   33 0  
>20 136 2.9   91 19.8  
Sex for drugs/money    0.52    0.00
never 826 1.8   147 2.7  
seldom 22 0   30 0  
frequent 22 4.5   75 22.7  
Sex on the first day    0.89    0.00
never 502 1.6   120 1.7  
seldom 215 1.9   41 2.4  
frequent 137 2.2   90 18.9  
Condom use with risky partner    0.53    0.01
never 232 1.3   73 1.4  
up to half of the cases 166 1.2   34 2.9  
in 3/4 of the cases 33 0   14 21.4  
nearly always 182 1.6   73 15.1  
no risky intercourse 236 3.0   52 7.7  
  1. p-value of chi square test or Fisher's exact test, respectively;