Table 1

Number of swinger and non-swinger clients, their (repeated) consultations, incidence of repeat testing and incidence of STI diagnoses (Chlamydia trachomatis and/or Neisseria gonorrhoea), at two Dutch STI clinics in South Limburg, 2006–2010 and 2010–2013, and Amsterdam, 2010–2013

 Age (years)Individual clients (n)*Clients with repeat consultationsTotal number of consultationsConsultations that are repeat consultationsConsultations per client (N)Average time between clients' consultation†Incidence of retesting (first retest)Incidence of STI at first retest)STI positivity in all consultations
Median
(IQR)
% of total
(N)
% within-risk group (N)% of total
consultations (N)
% within-risk group (N)Median
(IQR)
Median days
(IQR)
/100 PY, 95% CI
within-risk group
/100 PY, 95% CI
within-risk group
% within-risk group (N)
(2006–2009) South Limburg
 Swinger41 (35–46)5.9 (956)62.4 (597)12.0 (2669)64.2 (1713)2 (1–4)198 (144–262)69.1 (63.7 to 74.9)12.4 (9.3 to 16.3)9.9 (263)
 MSM31 (22–44)8.0 (1298)33.5 (435)10.0 (2215)41.4 (917)1 (1–2)260 (178–424)23.9 (21.7 to 26.2)14.4 (10.9 to 18.6)11.7 (259)
 Men25 (22–34)37.8 (6144)14.1 (864)32.8 (7287)15.7 (1143)1 (1–1)323 (182–543)8.3 (7.7 to 8.8)8.2 (6.5 to 10.3)9.7 (706)
 Women23 (20–28)48.3 (7853)19.4 (1521)45.2 (10 021)21.6 (2168)1 (1–1)292 (170–)483]11.8 (11.2 to 12.4)10.6 (9.0 to 12.4)10.2 (1027)
(2010–2013) South Limburg
 Swinger43 (37–48)8.1 (1577)62.6 (987)16.7 (5045)68.7 (3468)2 (1–4)203 (161–300)57.0 (53.5 to 60.6)10.8 (8.5 to 13.6)8.3 (418)
 MSM30 (22–45)10.2 (1985)44.7 (887)14.3 (4321)54.1 (2336)1 (1–3)223 (168–345)30.3 (28.3 to 32.3)18.0 (15.0 to 21.3)16.2 (702)
 Men24 (21–30)34.9 (6824)15.6 (1067))27.7 (8340)18.2 (1516)1 (1–1)314 (172–499)8.3 (7.8 to 8.8)14.3 (12.1 to 16.7)13.7 (1140)
 Women22 (20–25)46.8 (9146)22.9 (2092)41.2 (12 426)26.4 (3280)1 (1–1)288 (172–477)12.8 (12.2 to 13.3)13.6 (12.0 to 15.3)12.8 (1586)
(2010–2013) Amsterdam
 Swinger36 (28–44)1.1 (897)52.4 (470)1.5 (2070)56.7 (1173)2 (1–3)188 (108–331)48.3 (44.1 to 52.9)12.1 (9.0 to 15.9)10.7 (221)
 MSM36 (27–45)16.2 (12 691)51.2 (6499)26.5 (35 983)64.7 (23 292)2 (1–3)168 (98–252)39.0 (38.0 to 39.9)21.6 (20.3 to 22.8)18.0 (6494)
 Men26 (23–33)34.8 (27 332)23.8 (6513)28.3 (38 351)28.7 (11 019)1 (1–1)247 (132–433)14.0 (13.7 to 14.4)14.8 (13.9 to 15.7)13.7 (5236)
 Women23 (21–27)47.8 (37 531)30.4 (11 405)43.7 (59 241)36.6 (21 710)1 (1–2)211 (116–373)20.3 (19.9 to 20.6)11.9 (11.3 to 12.6)11.4 (6752)
  • *Clients may have visited the clinic before this period.

  • †In clients who have repeated consultations.

  • MSM, men who have sex with men; PY, person-years.