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Mean scores on neurodevelopmental scales at 6, 12, and 24 months of age.
| 6 Months | 12 Months | 24 Months | ||||
|---|---|---|---|---|---|---|
| N | Mean (SD) | N | Mean (SD) | N | Mean (SD) | |
| Bayley | ||||||
| Mental development index | 271 | 95.0 (7.9) | 258 | 101.3 (9.1) | 240 | 86.4 (11.7) |
| Psychomotor development index | 271 | 96.2 (11.1) | 257 | 107.0 (12.8) | 240 | 98.2 (10.4) |
|
| ||||||
| Preschool language scale | ||||||
| Auditory comprehension | 270 | 104.6 (12.9) | 257 | 99.1 (12.9) | ||
| Expressive comprehension | 270 | 91.1 (13.5) | 257 | 94.5 (13.8) | ||
| Total score | 270 | 97.7 (11.3) | 257 | 96.6 (13.5) | ||
