Table 1.
Characteristics of DDH patients and healthy controls.
| Characteristics | Discovery (N = 1,488) | Validation (N = 2,718) | ||
|---|---|---|---|---|
| DDH patients | Healthy controls | DDH patients | Healthy controls | |
| Number | 373 | 1,115 | 691 | 2,027 |
| Age, mean ± SD (months) | 23.6 ± 21.4 | 70.3 ± 44.4 | 20.8 ± 15.6 | 66.7 ± 31.6 |
| Male/Female | 79/294 | 232/883 | 108/583 | 326/1,701 |
| Acetabular dysplasia | 18 | 42 | ||
| Unilateral | 12 | NA | 28 | NA |
| Bilateral | 6 | NA | 14 | NA |
| Subluxation of the hips | 82 | 131 | ||
| Unilateral | 62 | NA | 102 | NA |
| Bilateral | 20 | NA | 29 | NA |
| Dislocation of the hips | 293 | 518 | ||
| Unilateral | 186 | NA | 378 | NA |
| Bilateral | 87 | NA | 140 | NA |
DDH: developmental dysplasia of the hips; SD: standard deviation; NA: not available.