TABLE 1.
Summary of Prader-Labhart-Willi syndrome craniofacial measurements
| Measurement | Proband chromosome subgroup (%)
|
|
|---|---|---|
| Deletion | Nondeletion | |
| Head circumference | ||
| < −2 SD | 6/21 (29) | 2/17 (12) |
| < −1 SD | 12/21 (57) | 8/17 (47) |
| Head length | ||
| < −2 SD | 3/21 (14) | 2/17 (12) |
| < −1 SD | 10/21 (48) | 7/17 (41) |
| Head breadth | ||
| < −2 SD | 9/21 (43) | 9/17 (53) |
| < −1 SD | 17/21 (81) | 16/17 (94) |
| Frontal diameter | ||
| < −2 SD | 15/17 (88) | 12/14 (86) |
| < −1 SD | 17/17 (100) | 14/14 (100) |
| Dolicocephaly | ||
| C.I.1 < 75% | 11/21 (52) | 12/17 (71) |
| C.I. < 77% | 14/21 (67) | 15/17 (88) |
1
C.I. is cephalic index, which is equal to head breadth/head length × 100.