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Table 1 Univariate analysis: characteristics of participants

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

  2007 2009 P-value Pooled data
N = 416 (%) N = 231 (%) N = 647 (%)
Serosorting      0.412   
Yes 157 (37.7) 90 (39.0)   247 (38.2)
No 237 (57.0) 134 (58.0)   371 (57.3)
No answer 22 (5.3) 7 (3.0)   29 (4.5)
Age      0.200   
< 25 yr. 82 (19.7) 49 (21.2)   131 (20.2)
25–49 yr. 282 (67.8) 150 (64.9)   432 (66.8)
≥ 50 yr. 46 (11.1) 32 (13.9)   78 (12.1)
No answer 6 (1.4) 0 -   6 (0.9)
Survey mode      0.100   
Paper 149 (35.8) 68 (29.4)   217 (33.5)
Internet 267 (64.2) 163 (70.6)   430 (66.5)
University degree      0.574   
Yes 185 (44.5) 110 (47.6)   295 (45.6)
No 230 (55.3) 121 (52.4)   351 (54.3)
No answer 1 (0.3) 0 -   1 (0.2)
Nationality      0.001   
Swiss national 336 (80.8) 166 (71.9)   502 (77.6)
Non Swiss national 69 (16.6) 64 (27.7)   133 (20.6)
No answer 11 (2.6) 1 (0.4)   12 (1.9)
Residence area > 100,000 inhabitants      0.297   
Yes 174 (41.8) 86 (37.2)   260 (40.2)
No 241 (57.9) 143 (61.9)   384 (59.4)
No answer 1 (0.2) 2 (0.9)   3 (0.5)
Gay organization      0.602   
Yes 60 (14.4) 38 (16.5)   98 (15.1)
No 355 (85.3) 193 (83.6)   548 (84.7)
No answer 1 (0.2) 0 -   1 (0.2)
Steady partner a      0.038   
Yes 172 (41.4) 116 (50.2)   288 (44.5)
No 240 (57.7) 115 (49.8)   355 (54.9)
No answer 4 (1.0) 0 -   4 (0.6)
Number of sexual partners with AI a      0.219   
None 9 (2.2) 2 (0.9)   11 (1.7)
1–5 partners 200 (48.1) 102 (44.2)   302 (46.7)
≥ 6 partners 207 (49.8) 126 (54.6)   333 (51.5)
No answer 0 - 1 (0.4)   1 (0.2)
Regularly frequenting sex-on-premises venues a      0.659   
Yes 82 (19.7) 47 (20.4)   129 (19.9)
No 322 (77.4) 180 (77.9)   502 (77.6)
No answer 12 (2.9) 4 (1.7)   16 (2.5)
Frequent use of the internet for sexual encounters a      0.558   
Yes 178 (42.8) 109 (47.2)   287 (44.4)
No 232 (55.8) 119 (51.5)   351 (54.3)
No answer 6 (1.4) 3 (1.3)   9 (1.4)
Sexually transmitted infections a      0.003   
Yes 72 (17.3) 56 (24.2)   128 (19.8)
No 330 (79.3) 175 (75.8)   505 (78.1)
No answer 14 (3.4) 0 -   14 (2.2)
UAI with partners of different or unknown HIV status a      0.510   
Yes 295 (70.9) 155 (67.1)   450 (69.6)
No 118 (28.4) 75 (32.5)   193 (29.8)
No answer 3 (0.7) 1 (0.4)   4 (0.6)
HIV test a      0.087   
Yes 177 (42.6) 106 (45.9)   283 (43.7)
No 231 (55.5) 125 (54.1)   356 (55.0)
No answer 8 (1.9) 0 -   8 (1.2)
HIV status declared      0.021   
Unknown 94 (22.6) 62 (26.8)   156 (24.1)
HIV negative 256 (61.5) 117 (50.7)   373 (57.7)
HIV positive/Aids 66 (15.9) 52 (22.5)   118 (18.2)
Frequent substance use while having sex a      0.054   
Yes 119 (28.6) 83 (35.9)   202 (31.2)
No 297 (71.4) 148 (64.1)   445 (68.8)
  1. Based on inclusion criteria: UAI with casual partners in the past 12 months.
  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 = 138 and N2009 = 116.)
  4. AI Anal Intercourse, UAI Unprotected Anal Intercourse.