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Table 2 Multivariate logistic regression: factors associated with serosorting

From: Men having sex with men serosorting with casual partners: who, how much, and what risk factors in Switzerland, 2007-2009

  aOR 95% CI P-value
Survey year
2007 1   0.982
2009 1.00 0.69–1.46  
Survey mode
Paper 1   
Internet 0.83 0.55–1.25 0.367
Age
< 25 yr. 0.83 0.50–1.36 0.457
25–49 yr. 1   
≥ 50 yr. 0.72 0.40–1.30 0.275
University degree
Yes 0.90 0.61–1.32 0.579
No 1   
Nationality
Non-Swiss national 0.98 0.62–1.55 0.943
Swiss national 1   
Residence area > 100,000 inhabitants
Yes 1.22 0.84–1.77 0.306
No 1   
Gay organization
Yes 1.67 1.02–2.73 0.043
No 1   
Steady partner a
Yes 0.75 0.52–1.08 0.119
No 1   
Number of sexual partners with AI a
1–5 partners 1   
≥ 6 partners 1.32 0.88–1.99 0.181
Regularly frequenting sex-on-premises venues a
Yes 0.42 0.26–0.708 0.001
No 1   
Frequent use of the internet for sexual encounters a
Yes 1.71 1.16–2.50 0.006
No 1   
Sexually transmitted infections a
Yes 1.70 1.07–2.69 0.024
No 1   
UAI with partners of different or unknown HIV status a
Yes 0.22 0.14–0.32 0.000
No 1   
HIV test a
Yes 1.47 0.98–2.19 0.063
No 1   
HIV status declared
Unknown 0.74 0.44–1.24 0.256
HIV negative 1   
HIV positive/Aids 0.52 0.31–0.87 0.013
Frequent substance use while having sex a
Yes 1.01 0.67–1.52 0.958
No 1   
  1. The reference category for the dependant variable is “having practised serosorting”. Bold denotes adjusted odds ratio significant at the 0.003 level.
  2. a In the past 12 months.
  3. b Among respondents who had a steady partner and had AI with him in the past 12 months (N2007 = 151 and N2009 = 117).
  4. AI: Anal Intercourse; aOR: adjusted odds ratio; CI: confidence interval.