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Table 2 Characteristics of 1781 sexual partners and partnerships of 577 men who have sex with men, by means of how the participant established the partnership, Amsterdam, 2008-9

From: Does online dating lead to higher sexual risk behaviour? A cross-sectional study among MSM in Amsterdam, the Netherlands

  Total Online acquired partnerships Offline acquired partnerships P valueb
n(%)e n(%)e n(%)e n(%)e
N 1781 878 903  
Demographicsa     
Median age of partner in years (IQR) 34 (28–40) 34 (28–40) 34 (28–39) 0.546
Age of partner in years categorised     0.148
  < 30 540 (30.5 %) 275 (31.5 %) 265 (29.6 %)  
 30–34 371 (21.0 %) 174 (19.9 %) 197 (22.0 %)  
 35–39 392 (22.2 %) 179 (20.5 %) 213 (23.8 %)  
  ≥ 40 466 (26.3 %) 246 (28.2 %) 220 (24.6 %)  
Median age difference in years participant - partner (IQR)c 4 (−2 to 10) 3 (−3 to 10) 4 (−2 to 10) 0.013
Age difference participant - partner, categorised     0.137
 Partner >5 years older than participant 279 (15.8 %) 151 (17.3 %) 128 (14.3 %)  
 Partner and participant differ ≤5 years 767 (43.4 %) 375 (42.9 %) 392 (43.8 %)  
 Partner is >5 years younger than participant 723 (40.9 %) 348 (39.8 %) 375 (41.9 %)  
Ethnic group partner     <0.001
 Dutch 974 (57.6 %) 520 (61.3 %) 454 (54.0 %)  
 Western, non-Dutch 323 (19.1 %) 127 (15.0 %) 196 (23.3 %)  
 Non-western 393 (23.3 %) 202 (23.8 %) 191 (22.7 %)  
Concordance between ethnic group of participant - partner     0.025
 Concordant ethnicity 767 (43.1 %) 399 (45.4 %) 368 (40.8 %)  
 Different ethnicity 1014 (56.9 %) 479 (54.6 %) 535 (59.3 %)  
Concordance in life styles participant - partner     0.353
 No difference in life styles 703 (39.5 %) 338 (38.5 %) 365 (40.4 %)  
 Differences in life styles 1078 (60.5 %) 540 (61.5 %) 538 (59.6 %)  
HIV status partner     
Perceived HIV status of partner     <0.001
 HIV-negative 715 (40.2 %) 388 (44.2 %) 327 (36.2 %)  
 HIV-positive 270 (15.2 %) 151 (17.2 %) 119 (13.2 %)  
 Unaware 796 (44.7 %) 339 (38.6 %) 457 (50.6 %)  
Perceived HIV concordance participant - partner     <0.001
 Same HIV status 789 (44.3 %) 430 (49.0 %) 359 (39.8 %)  
 Different HIV status 135 (7.6 %) 72 (8.2 %) 63 (7.0 %)  
 HIV status of participant or partner unknown 857 (48.1 %) 376 (42.8 %) 481 (53.3 %)  
Does partner know HIV status of participant?     <0.001
 No 201 (11.3 %) 101 (11.5 %) 100 (11.1 %)  
 Yes 585 (32.9 %) 340 (38.8 %) 245 (27.2 %)  
 Possibly 993 (55.8 %) 436 (49.7 %) 557 (61.8 %)  
Sexual behaviour     
Partnership type     <0.001
 Known partner 1137 (65.9 %) 661 (77.7 %) 476 (54.4 %)  
 Anonymous partner 589 (34.1 %) 190 (22.3 %) 399 (45.6 %)  
Sex frequency with partnerd     <0.001
 Once 961 (54.0 %) 431 (49.1 %) 530 (58.7 %)  
 2–5 times 624 (35.1 %) 344 (39.2 %) 280 (31.0 %)  
 5–10 times 129 (7.3 %) 74 (8.4 %) 55 (6.1 %)  
  > 10 times 66 (3.7 %) 28 (3.2 %) 38 (4.2 %)  
UAI     0.082
 No 1339 (75.2 %) 646 (73.6 %) 693 (76.7 %)  
 Yes 442 (24.8 %) 232 (26.4 %) 210 (23.3 %)  
Group sex with partner     0.003
 No 1518 (85.3 %) 771 (87.9 %) 747 (82.7 %)  
 Yes 262 (14.5 %) 106 (12.1 %) 156 (17.3 %)  
Paid sex with partner     0.055
 No 1723 (96.9 %) 841 (96.0 %) 882 (97.7 %)  
 Yes 56 (3.2 %) 35 (4.0 %) 21 (2.3 %)  
Sex-related substance use in partnership     
Any sex-related substance use     <0.001
 No 633 (35.5 %) 344 (39.2 %) 289 (32.0 %)  
 Yes 1148 (64.5 %) 534 (60.8 %) 614 (68.0 %)  
Sex-related alcohol use     <0.001
 No 1143 (64.2 %) 627 (71.4 %) 516 (57.1 %)  
 Yes 638 (35.8 %) 251 (28.6 %) 387 (42.9 %)  
Sex-related use of 2 or more substances other than alcohol     0.576
 No 1467 (82.4 %) 719 (82.0 %) 748 (82.8 %)  
 Yes 313 (17.6 %) 158 (18.0 %) 155 (17.2 %)  
  1. Abbreviations: UAI unprotected anal intercourse, IQR interquartile range, MSM men who have sex with men
  2. aData were missing for partner’s age: online (4), offline (8); age difference: online (4), offline (8); partner’s ethnicity: online (29), offline (62); partnership type: online (27), offline (28); whether partner knows HIV status of participant: online (1), offline (1); sex frequency with partner: online (1); group sex: online (1); paid sex: online (2); use of 2 or more drugs during sex: online (1)
  3. bP was calculated using logistic regression accounting for clustered observations
  4. cAge difference was calculated by subtracting the age of the partner from the age of the participant
  5. dThe questionnaire stated overlapping categories
  6. eUnless specified otherwise