Numbers and proportions by sociodemographic characteristics and sexual risk factors of the study population in 1996 and 2007
| Characteristics | Study population 1996 | Study population 2007 | 1996 vs 2007 | ||
|---|---|---|---|---|---|
| N | (%) | N | (%) | χ2 | |
| Total | 1579 | (100) | 1597 | (100) | – |
| Gender | |||||
| Women | 958 | (60.7) | 972 | (60.9) | 0.91 |
| Men | 621 | (39.3) | 625 | (39.1) | |
| Age group | |||||
| 15–24 years | 590 | (37.4) | 615 | (38.5) | 0.51 |
| 25–39 years | 989 | (62.6) | 982 | (61.5) | |
| Ethnicity | |||||
| Western | 1493 | (94.6) | 1446 | (90.5) | <0.01 |
| Non–Western | 85 | (5.4) | 151 | (9.5) | |
| Unknown | 1 | (0.0) | 0 | (0.0) | |
| Level of urbanisation | |||||
| Very high | 172 | (10.9) | 298 | (18.7) | <0.01 |
| High | 211 | (13.4) | 749 | (46.9) | |
| Moderate | 427 | (27.0) | 205 | (12.8) | |
| Low | 317 | (20.1) | 141 | (8.8) | |
| Very low | 452 | (28.6) | 204 | (12.8) | |
| Level of education* | |||||
| Low | 356 | (22.5) | 254 | (15.9) | <0.01 |
| Average | 530 | (33.6) | 612 | (38.3) | |
| High | 524 | (33.2) | 710 | (44.5) | |
| Unknown | 169 | (10.7) | 21 | (1.3) | |
| Sexual preference | |||||
| Women | 958 | (60.7) | 972 | (60.9) | 0.95 |
| Heterosexual men | 415 | (26.3) | 409 | (25.6) | |
| MSM | 5 | (0.3) | 6 | (0.4) | |
| Unknown | 201 | (12.7) | 210 | (13.1) | |
| Self–reported history of CT | |||||
| No | 1336 | (84.6) | 1491 | (93.4) | <0.01 |
| Yes | 11 | (0.7) | 32 | (2.0) | |
| Unknown | 232 | (14.7) | 74 | (4.6) | |
| No of sexual partners† | |||||
| 0–1 | 1028 | (65.1) | 1151 | (72.1) | – |
| ≥2 | 79 | (5.0) | 73 | (4.6) | |
| Unknown | 472 | (29.9) | 373 | (23.4) | |
| Regular partner‡ | NA | ||||
| No | 458 | (28.7) | – | ||
| Yes | 1095 | (68.6) | |||
| Unknown | 44 | (2.7) | |||
| Condom use last sexual contact‡ | NA | ||||
| No | 851 | (53.3) | – | ||
| Yes | 237 | (14.8) | |||
| Unknown | 509 | (31.9) | |||
| Condom use regular partner‡ | NA | ||||
| Never | 737 | (46.1) | – | ||
| Sometimes | 69 | (4.3) | |||
| Always | 179 | (11.2) | |||
| Unknown | 612 | (38.3) | |||
| Condom use with casual partner‡ | NA | ||||
| Never | 40 | (2.5) | – | ||
| Sometimes | 13 | (0.8) | |||
| Always | 68 | (4.3) | |||
| Unknown | 1476 | (92.4) | |||
*Between 1996 and 2007, changes in the Dutch education system were implemented. To compare ‘level of education’ between 1996 and 2007, three categories were created: basic, medium and high education.
†1996: number of partners in the past year; 2007: number of partners in the past 6 months.
‡Data not collected in 1996.
CT, Chlamydia trachomatis; MSM, men who have sex with men; NA, not asked.