| Single testers | Repeat testers | ||||||
---|---|---|---|---|---|---|---|---|
 |  |  | Crude | Adjusted | ||||
 | n | % | n | % | OR | 95% CI | OR | 95% CI |
Total | 41,129 | 88.9 | 5157 | 11.1 | Â | Â | Â | Â |
Age | ||||||||
 13–19 | 2596 | 6.3 | 299 | 5.8 | 1 | – | 1 | – |
 20–24 | 19,139 | 46.5 | 2582 | 50.1 | 1.17 | (1.03–1.33) | 1.08 | (0.94–1.23) |
 25+ | 19,394 | 47.2 | 2276 | 44.1 | 1.02 | (0.90–1.16) | 0.82 | (0.72–0.93) |
Education levela,c | ||||||||
 Low | 12,971 | 31.5 | 1516 | 29.4 | 1 | – | 1 | – |
 High | 22,363 | 54.4 | 2376 | 46.1 | 0.91 | (0.85–0.97) | 0.98 | (0.91–1.06) |
Ethnicity | ||||||||
 Dutch | 26,964 | 65.6 | 3006 | 58.3 | 1 | – | 1 | – |
 Western non-Dutch | 2524 | 6.1 | 322 | 6.3 | 1.14 | (1.01–1.29) | 1.06 | (0.93–1.20) |
 Non-Western | 11,602 | 28.2 | 1828 | 35.4 | 1.41 | (1.33–1.50) | 1.37 | (1.28–1.46) |
Number of sex partners in past 6Â months | ||||||||
 0–1 | 8559 | 21.0 | 529 | 10.4 | 1 | – | 1 | – |
 2–3 | 16,191 | 39.7 | 1783 | 34.9 | 1.78 | (1.61–1.97) | 1.75 | (1.58–1.94) |
 4+ | 16,023 | 39.3 | 2801 | 54.8 | 2.83 | (2.57–3.12) | 2.80 | (2.54–3.09) |
Condom use at last sexual contact | ||||||||
 No | 29,257 | 73.8 | 3720 | 74.5 | 1 | – | – | – |
 Yes | 10,376 | 26.2 | 1273 | 25.5 | 0.96 | (0.90–1.03) | – | – |
Received partner notification | ||||||||
 No | 30,763 | 75.2 | 3917 | 76.2 | 1 | – | – | – |
 Yes | 10,155 | 24.8 | 1223 | 23.8 | 0.95 | (0.88–1.01) | – | – |
Reported STI symptoms | ||||||||
 No | 26,968 | 65.9 | 3135 | 61.1 | 1 | – | 1 | – |
 Yes | 13,939 | 34.1 | 1995 | 38.9 | 1.23 | (1.16–1.31) | 1.10 | (1.03–1.17) |
History of STI (CT/GO/SY)a,b | ||||||||
 No | 34,088 | 82.9 | 4103 | 79.6 | 1 | – | 1 | – |
 Yes | 2610 | 6.4 | 721 | 14.0 | 2.30 | (2.10–2.51) | 2.08 | (1.90–2.28) |
Chlamydia infection | ||||||||
 No | 35,373 | 86.0 | 3910 | 75.8 | 1 | – | 1 | – |
 Yes | 5756 | 14.0 | 1247 | 24.2 | 1.96 | (1.83–2.10) | 1.85 | (1.72–1.99) |