| Females | Males | Total | p-value | |||
---|---|---|---|---|---|---|---|
Subjects, no. | %a | Subjects, no. | %a | Subjects, no. | %a | ||
Overall | 5973 | 48.7 | 6284 | 51.3 | 12,257 | 100 | Â |
Age group (y) | 0.248 | ||||||
 1–3 | 616 | 15.4 | 649 | 15.4 | 1265 | 15.4 |  |
 4–6 | 882 | 16.7 | 933 | 16.6 | 1815 | 16.6 |  |
 7–9 | 1071 | 17.0 | 1146 | 17.0 | 2217 | 17.0 |  |
 10–11 | 823 | 11.4 | 851 | 11.4 | 1674 | 11.4 |  |
 12–13 | 889 | 12.2 | 960 | 12.2 | 1849 | 12.2 |  |
 14–15 | 858 | 13.6 | 963 | 13.6 | 1821 | 13.6 |  |
 16–17 | 834 | 13.8 | 782 | 13.8 | 1616 | 13.8 |  |
Region of residence | 0.426 | ||||||
 West Germany | 3922 | 83.2 | 4169 | 83.2 | 8091 | 83.2 |  |
 East Germany | 2051 | 16.8 | 2115 | 16.8 | 4166 | 16.8 |  |
Urbanity | 0.090 | ||||||
 Rural | 1338 | 18.3 | 1382 | 18.5 | 2720 | 18.4 |  |
 Small city | 1561 | 27.5 | 1660 | 27.4 | 3221 | 27.5 |  |
 Medium sized city | 1768 | 29.6 | 1764 | 29.1 | 3532 | 29.3 |  |
 Large city | 1306 | 24.6 | 1478 | 25.0 | 2784 | 24.8 |  |
Socioeconomic status of parents | 0.612 | ||||||
 Low | 1569 | 33.8 | 1656 | 34.3 | 3225 | 34.1 |  |
 Middle | 2744 | 43.0 | 2882 | 42.0 | 5626 | 42.5 |  |
 High | 1523 | 20.9 | 1579 | 21.1 | 3102 | 21.0 |  |
 NA | 137 | 2.4 | 167 | 2.6 | 304 | 2.5 |  |
Migratory background of parents | 0.319 | ||||||
 None | 4680 | 74.2 | 4891 | 74.0 | 9571 | 74.1 |  |
 One parent | 403 | 8.1 | 431 | 8.4 | 834 | 8.3 |  |
 Both parents | 861 | 17.3 | 943 | 17.3 | 1804 | 17.3 |  |
 NA | 29 | 0.5 | 19 | 0.3 | 48 | 0.4 |  |