Rates of delay by gestational age at birth
| < 32 weeks (n = 24) | 32–34 weeks (n = 32) | 34–36 weeks (n = 29) | |
| WPPSI (n = 68) | |||
| < 70 | 1 | 1 | 0 |
| 70–80 | 3 | 3 | 2 |
| 80–120 | 15 | 24 | 18 |
| > 120 | 0 | 0 | 1 |
| Peabody (n = 40) | |||
| Gross Motor Disability | 2 | 0 | 4 |
| Fine Motor Disability | 4 | 8 | 9 |
| Denver (n = 31) | |||
| Failed | 1 | 4 | 0 |
| Cerebral Palsy | 3 | 0 | 0 |