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Table 2 Results of Bi- und Multivariate analysis of associations between age, partner numbers, meeting places with sex partners, substance use during sex, biological cofactors and risk behaviours with the outcomes UAI, rectal STI and HIV diagnosis

From: Risk factors for HIV and STI diagnosis in a community-based HIV/STI testing and counselling site for men having sex with men (MSM) in a large German city in 2011–2012

  Bivariate Multivariate Bivariate Multivariate Bivariate Multivariate
  UAI     STI rectal or syphilis    HIV    
  OR 95% CI OR 95% CI OR 95% CI OR 95% CI OR 95% CI OR 95% CI
Age group             
<30 1.54*** 1.18-1.96 1.67*** 1.26-2.23 1.78** 1.12-2.86    1.06 0.49-2.33   
30-44 (ref.) 1     1     1    
>44 years 1.11 0.86-1.43    0.87 0.49-1.54    1.27 0.58-2.80   
Partner number             
0-2 (ref.) 1     1     1    
3-5 1.15 0.80-1.64    2.71 0.76-9.66    1.41 0.48-4.14   
6-10 1.18 0.83-1.70    6.10*** 1.82-20.41 6.13*** 1.79-20.9 0.82 0.25-2.72   
>10 1.59*** 1.12-2.25    5.06*** 1.51-16.91 5.27*** 1.55-18.0 0.91 0.30-2.83   
Meeting sex partners             
At friends 1.20 0.93-1.47    1.31 0.85-2.02    0.47* 0.21-1.06   
In bars 1.02 0.81-1.28    0.95 0.60-1.49    0.84 0.42-1.69   
In gay bathhouses 1.05 0.83-1.32    1.25 0.80-1.95    1.08 0.55-2.15   
In porn cinemas 1.07 0.81-1.42    1.11 0.65-1.89    1.83* 0.90-3.71   
In outside cruising sites 1.02 0.71-1.47    0.66 0.28-1.53    1.10 0.39-3.13   
On highway resting areas 1.29 0.67-2.46    1.51 0.53-4.33    0.90 0.12-6.74   
Online 1.49*** 1.20-1.84 1.29** 1.01-1.65 1.45* 0.93-2.26    0.81 0.44-1.52   
At parties or discotheques 1.41*** 1.12-1.78    0.94 0.60-1.48    0.61 0.29-1.29   
In public urinals 1.55 0.73-3.26    1.34 0.40-4.48    0.97 0.96-0.98   
In fitness centres 1.12 0.75-1.69    0.68 0.27-1.71    0.31 0.04-2.26   
Substance use             
Alcohol 1.32*** 1.07-1.62    0.82 0.54-1.24    0.63 0.34-1.17   
Inhaled Amyl nitrite 1.68*** 1.31-2.15 1.63*** 1.23-2.17 1.04 0.65-1.67    1.67 0.88-3.19   
Sildenafil 1.53* 0.96-2.43    1.22 0.55-2.72    1.20 0.36-3.95   
Cocaine, Speed 1.65* 0.93-2.91    2.36** 1.09-5.15    1.21 0.28-5.12   
Cannabis 1.50* 0.97-2.30    1.23 0.58-2.62    1.04 0.32-3.42   
Ecstasy 3.54 0.78-16.03    4.23* 1.15-15.65 5.77** 1.40-23.8 2.83 0.36-22.32   
GBL,GHB 0.61** 0.58-0.63    4.67* 0.93-23.44    4.88 0.59-40.56   
Cofactors, behaviours             
Unprotected anal intercourse n.a.     2.39*** 1.46-3.93 2.42*** 1.29-4.53 4.52*** 1.76-11.59 3.24* °  
STI co-diagnosis n.a.     n.a.     3.02** 1.22-7.46 4.52*** 1.68-12.1
Having sex with partners who appear healthy n.a.     3.09*** 1.94-4.92 2.92*** 1.68-5.07 1.27 0.56-2.91   
Asking the insertive partner not to ejaculate inside n.a.     2.11** 1.16-3.86    4.34*** 2.11-8.89 4.44*** 1.75-11.3
Asking the partner about HIV status n.a.     1.71** 1.03-2.85    2.03* 1.00-4.11   
Partner reluctant to use condoms n.a.     1.30 0.72-2.34    2.68** 1.32-5.45   
No condom available n.a.     2.81** 1.46-5.41    3.10** 1.26-7.60   
  1. *p > 0.05 < =0.10; **p < =0.05 > 0.01; ***p < =0.01.
  2. n.a. = not applicable.
  3. °Results of Multivariate logistic regression only reported if p < =0.05 (except for UAI as risk factor for HIV diagnosis, p = 0.07).