Test applicants for Huntington's disease sorted by sex, parental status, and age in Leiden, The Netherlands (1987–97)
| Test applicants | <40 years | ⩾40 years | Total |
| With children (sex ratio (M:F)) | 140 (53:87) | 185 (84:101) | 325 (137:188) |
| Without children (sex ratio (M:F)) | 381 (162:219) | 35 (14:21) | 416 (176:240) |
| Total | 521 | 220 | 741 |