Characteristics of the study population, young women and MSM, recruited at sexual health clinics in 2009–2019 in the Netherlands
| Women | MSM | |
| Characteristic | N (%) or median (IQR) | N (%) or median (IQR) |
| Total | 1492 (100.0) | 614 (100.0) |
| Year of participation | ||
| 2009 | 12 (0.8) | 51 (8.3) |
| 2011 | 133 (8.9) | 79 (12.9) |
| 2013 | 153 (10.3) | 112 (18.2) |
| 2015 | 367 (24.6) | 103 (16.8) |
| 2017 | 409 (27.4) | 110 (17.9) |
| 2019 | 418 (28.0) | 159 (25.9) |
| Median age (years) | 21 (20–23) | 22 (20–23) |
| Education level* | ||
| Low/Middle | 316 (21.3) | 190 (31.2) |
| High | 1171 (78.8) | 420 (68.9) |
| Self-defined country of birth | ||
| The Netherlands | 1278 (85.7) | 498 (81.1) |
| Smoking† | ||
| (Almost) never | 633 (42.4) | 200 (32.6) |
| Previously | 58 (3.9) | 18 (2.9) |
| Currently | 466 (31.2) | 148 (24.1) |
| Unknown | 335 (22.5) | 248 (40.4) |
| Received at least one dose of HPV vaccine (self-reported) | ||
| No | 725 (48.6) | 505 (82.3) |
| Yes | 630 (42.2) | 19 (3.1) |
| Unknown | 137 (9.2) | 90 (14.7) |
| Median age of sexual debut (years)‡ | 16 (15–17) | 17 (15–18) |
| No. of sex partners previous 6 months | ||
| 0–1 | 384 (25.8) | 101 (16.5) |
| 2–3 | 727 (48.8) | 185 (30.1) |
| ≥4 | 380 (25.5) | 328 (53.4) |
| No. of sex partners lifetime | ||
| 0–4 | 344 (23.6) | 79 (13.0) |
| 5–9 | 528 (35.2) | 119 (19.6) |
| ≥10 | 587 (39.2) | 408 (67.3) |
| Condom use steady partner previous 6 months | ||
| Mostly not using condom | 763 (51.5) | 191 (31.5) |
| Sometimes using condom | 261 (17.6) | 102 (16.8) |
| Always using condom | 73 (4.9) | 99 (16.3) |
| No steady partner | 385 (26.0) | 215 (35.4) |
| Condom use casual partner previous 6 months | ||
| Mostly not using condom | 344 (28.5) | 73 (13.5) |
| Sometimes using condom | 701 (58.0) | 240 (44.4) |
| Always using condom | 163 (13.5) | 227 (42.0) |
| No casual partner | 269 (18.2) | 71 (11.6) |
| STI-related symptoms | 413 (27.9) | 132 (21.5) |
| History of STI | ||
| No | 751 (50.6) | 269 (44.0) |
| Yes | 467 (31.4) | 268 (43.8) |
| Never tested before | 267 (18.0) | 75 (12.3) |
| Receptive anal intercourse ever§¶ | 751 (51.3) | 512 (91.4) |
| Current chlamydia, genital** | 221 (14.8) | 21 (3.4) |
| HIV status | ||
| Negative | 692 (56.9) | 474 (95.8) |
| Positive | 2 (0.2) | 20 (4.0) |
| Unknown/never tested | 523 (43.0) | 1 (0.2) |
| Genital HPV detection | ||
| No | 343 (23.0) | 420 (68.4) |
| Single | 377 (25.3) | 121 (19.7) |
| Multiple | 772 (51.7) | 73 (11.9) |
| Anal HPV detection | ||
| No | 799 (53.6) | 313 (51.0) |
| Single | 270 (18.1) | 136 (22.1) |
| Multiple | 423 (28.4) | 165 (26.9) |
| Type-specific concurrent detection, for at least one genotype | 607 (40.7) | 64 (10.4) |
Totals may vary, because of missings. Total percentages may not add up to 100 due to rounding.
*High education level is defined as higher general secondary education, preuniversity education, university for applied sciences and university. Low/Middle is defined as all other levels of education.
†No information was available for those participating in 2009–2013, as the relevant question was not part of the questionnaire in that year.
‡Minimum-maximum range was 11–24 years for women and 7–22 years for MSM.
§Some MSM had exclusive receptive or insertive anal intercourse, some had a combination of receptive and insertive anal intercourse.
¶No information was available for those participating in 2009, as the relevant question was not part of the questionnaire in that year.
**Diagnosis made at the same visit to the sexual health clinic at which the participant was included in this study.
HPV, human papillomavirus; MSM, men who have sex with men.;