Mean age of onset of progressive diaphyseal dysplasia in the older and younger generations in the family described here (family 1), the family reported by Naveh et al4 (family 2), and other pedigrees.5–10
| Number | Mean | SD | p | |||
| Family 1 | Older generation | 5 | 21.2 | 5.4 | ||
| Younger generation | 10 | 9.8 | 5.3 | 0.001903 | ||
| Family 2 | Older generation | 5 | 18.0 | 10.2 | ||
| Younger generation | 5 | 4.2 | 3.1 | 0.020079 | ||
| Families 1 and 2 | Older generation | 10 | 19.6 | 7.9 | ||
| Younger generation | 15 | 7.9 | 5.3 | 0.000195 | ||
| Other pedigrees | Older generation | 7 | 21.4 | 10.5 | ||
| Younger generation | 5 | 3.0 | 1.9 | 0.003419 | ||