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Distribution of PDI and MDI in the Bayley Scale according to age at evaluation (mean ± SD).
| Age at evaluation (months) | PDI | MDI |
|---|---|---|
| 1 (n = 225) | 97.6 ± 7.2 | 98.6 ± 4.5 |
| 3 (n = 233) | 86.4 ± 4.1 | 94.7 ± 5.5 |
| 6 (n = 227) | 94.8 ± 8.7 | 96.3 ± 4.2 |
| 12 (n = 191) | 91.0 ± 7.4 | 94.1 ± 7.1 |
