Table 3 Rates of delay and mean age of acquisition for developmental milestones
| Â | Full Sample | ADNP | CHD8 | DYRK1A |
|---|---|---|---|---|
Independent Walking | N = 64 | N = 20 | N = 18 | N = 26 |
 No delay (Met by 18 mos) | 23 (35.9%) | 4 (20.0%) | 8 (44.4%) | 11 (42.3%) |
 Delayed (Not met by 18 mos) | 41 (64.1%) | 16 (80.0%) | 10 (55.6%) | 15 (57.7%) |
 Age (months) if achieved (Mean, SD) | 22.8 (8.2) | 25.5 (8.2) | 19.6 (5.8) | 23.0 (9.2) |
Range: 12 to 54 | Range: 17 to 48 | Range: 12 to 36 | Range: 12 to 54 | |
Single Word Acquisition | N = 63 | N = 20 | N = 17 | N = 26 |
 No delay (Met by 24 mos) | 16 (25.4%) | 3 (15.0%) | 8 (47.1%) | 5 (19.2%) |
 Delayed (Not met by 24 mos) | 47 (74.6%) | 17 (85.0%) | 9 (52.9%) | 21 (80.8%) |
 Age (months) if achieved (Mean, SD) | 37.0 (23.0) | 39.0 (14.4) | 29.2 (24.2) | 42.2 (26.9) |
Range: 9 to 120 | Range: 18 to 72 | Range: 9 to 108 | Range: 11 to 120 |