Table 1. Study characteristics of the 1995–96 and 2006–07 survey of individuals older than 15 years of age.
| 1995–96 survey | 2006–07 survey | ||
| Variable | N (%) | N (%) | P-value |
| Age | |||
| 16–19 | 103 (5) | 160 (4) | 0.0425 |
| 20–24 | 188 (9) | 364 (8) | |
| 25–29 | 193 (9) | 348 (8) | |
| 30–39 | 364 (17) | 715 (17) | |
| 40–49 | 330 (15) | 641 (15) | |
| 50–59 | 382 (17) | 714 (16) | |
| 60–69 | 333 (15) | 799 (18) | |
| >70 | 295 (13) | 593 (14) | |
| Sex | |||
| Male | 996 (46) | 1864 (43) | 0.0535 |
| Female | 1192 (54) | 2470 (57) | |
| Ethnicity | |||
| Dutch | 1988 (91) | 3544 (82) | <0.0001 |
| First generation migrants | 94 (4) | 498 (11) | |
| Second gen. migrants | 106 (5) | 292 (7) | |
| Marital status | |||
| Married | 1372 (63) | 2547 (59) | <0.0001 |
| Living together | 180 (8) | 469 (11) | |
| Not married | 406 (19) | 851 (20) | |
| Divorced | 88 (4) | 240 (6) | |
| Widow | 142 (6) | 227 (5) | |
| Ever had sexual intercourse | |||
| No | 107 (5) | 177 (4) | 0.0531 |
| Yes | 1898 (95) | 4001 (96) | |
| Number of sex partners | last 12 months | last 6 months | |
| 0 | 370 (19) | 662 (19) | N/A |
| 1–2 | 1506 (79) | 2736 (80) | |
| >2 | 26 (1) | 20 (1) | |
| Age at first sexual intercourse | |||
| <17 | 236 (15) | 677 (21) | <0.0001 |
| 17–19 | 575 (36) | 1251 (39) | |
| >19 | 789 (49) | 1307 (40) | |
| Mean (SD), years* | 17.5 (17.1–17.9) | 16.9 (16.6–17.2) | |
| Ever had STI | |||
| no | 1821 (98) | 3612 (94) | <0.0001 |
| yes | 39 (2) | 211 (6) |
Note: Persons are ≥16 years of age, 1995–96 survey n = 2188, 2006–07 survey n = 4334,
*
Persons <26 years, N/A: not applicable.