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Table 4 Associations of potential risk factors with three different STI outcomes among MSM respondents of the Internet-based cross-sectional study.

From: Self-reported sexually transmitted infections and their correlates among men who have sex with men in Norway: an Internet-based cross-sectional survey

Potential risk factors Chlamydia N = 101   gonorrhoea N = 35   HIV
N = 42
 
  Adjusted PR [95% CI] p for trend Adjusted PR [95% CI] p for trend Adjusted PR [95% CI] p for trend
age groups (years)   0.002   0.255   0.932
16-25 ref. group   ref. group   ref. group  
26-35 0.6 [0.4-1.1]   0.5 [0.2-1.6]   1.4 [0.6-3.2]  
36-45 0.4 [0.2-0.9]   0.7 [0.2-2.3]   0.8 [0.3-2.1]  
≥ 46 0.3 [0.1-0.7]   0.6 [0.1-2.2]   1.5 [0.6-3.8]  
residing in Oslo or Akershus county       
no ref. group   ref. group   ref. group  
yes 1.4 [1.0-2.1]   1.9 [0.9-4.1]   2.3 [1.2-4.6]  
ethnic background:       
Norwegian ref. group   ref. group   ref. group  
immigrant with western background 0.3 [0.0-1.8]   1.5 [0.4-6.1]   0.4 [0.0-3.0]  
immigrant with non-western background 2.8 [1.4-5.7]   1.8 [0.5-6.1]   5.4 [1.9-15.3]  
unknown not included   5.9 [1.3-26.3]   not included  
education   0.568   0.987   not
primary school or less ref. group   ref. group   merged with ref. group calculated
secondary school 0.6 [0.3-1.2]   1.7 [0.2-16.1]   ref. group  
high school/university 0.5 [0.3-1.1]   1.6 [0.1-16.5]   0.8 [0.5-1.5]  
annual income before tax in 1000 NOK* in 2005   0.204   0.380   0.102
< 150 ref. group   ref. group   ref. group  
150-299 1.1 [0.6-1.9]   1.0 [0.4-2.5]   1.0 [0.4-2.7]  
300-500 1.2 [0.6-2.1]   0.1 [0.0-0.6]   0.8 [0.3-1.9]  
> 500 1.3 [0.6-2.9]   1.0 [0.3-2.9]   1.5 [0.6-4.3]  
unknown not included   not included   10.4 [1.5-71.4]  
N of male sexual partners in life:   < 0.001   0.056   < 0.001
1-10 ref. group   ref. group   ref. group  
11-50 4.0 [1.8-8.8]   2.4 [0.7-7.6]   3.0 [0.7-13.2]  
51- > 500 4.4 [1.9-10.3]   4.5 [1.3-15.6]   13.9 [3.5-55.8]  
N of male sexual partners in the past 6 months   0.308   0.065   0.544
0-2 ref. group   ref. group   ref. group  
3-5 1.2 [0.6-2.2]   1.7 [0.6-4.9]   0.6 [0.2-1.8]  
6-10 1.2 [0.7-2.3]   3.1 [1.1-8.8]   0.4 [0.1-1.5]  
> 10 1.6 [0.8-3.2]   3.4 [1.0-11.3]   0.7 [0.2-2.3]  
practice of threesome or group sex       
no ref. group   ref. group   ref. group  
yes 1.5 [1.0-2.3]   0.8 [0.4-1.7]   1.0 [0.5-2.1]  
received money for sex in the last year       
no ref. group   ref. group   ref. group  
yes 0.9 [0.3-2.2]   2.3 [0.7-8.4]   1.9 [0.4-8.3]  
paid for sex in the last year       
no ref. group   ref. group   ref. group  
yes 1.6 [0.8-3.2]   1.2 [0.3-3.9]   0.6 [0.1-2.2]  
unknown not included   5.5 [0.4-82.7]   not included  
how many times feeling drunk in a given month   0.409   0.283   < 0.001
< 1 ref. group   ref. group   ref. group  
1 1.6 [0.7-4.0]   3.9 [0.9-16.8]   1.1 [0.4-2.7]  
2-3 2.0 [0.9-4.5]   3.3 [0.8-12.9]   0.6 [0.2-1.3]  
≥ 4 1.6 [0.7-3.5]   1.3 [0.3-5.0]   0.1 [0.0-0.3]  
unsafe sex under the influence of alcohol in the past 12 months       
no ref. group   ref. group   ref. group  
yes 1.8 [1.1-2.9]   1.9 [0.9-4.3]   1.5 [0.7-3.4]  
under the influence of selected drugs** during sex in the past 12 months       
no ref. group   ref. group   ref. group  
yes 0.8 [0.5-1.5]   1.7 [0.8-3.9]   5.2 [2.7-11.4]  
ever had a date in reality with Internet partner       
no ref. group   not included   ref. group  
yes 1.6 [0.5-5.0]     1.4 [0.4-4.6]  
UAI*** with a casual or anonymous partner in the last 6 months       
no ref. group   ref. group   ref. group  
yes 1.5 [0.9-2.4]   1.0 [0.5-2.2]   2.0 [0.9-4.6]  
  1. * NOK - Norwegian crowns
  2. **selected drugs included: marihuana, prescription drugs, ecstasy, LSD, GHB, cocaine, heroine, amphetamines, methamphetamines
  3. *** UAI - unprotected anal intercourse
  4. Results represent three separate multivariable models with self-reported STI as outcomes. Different exclusion criteria were applied in these models, as described in the text and presented in the Table 1.