Table 1.
Means and Standard Deviations (SD) of Head Circumference (HC) and Developmental Outcomes.
| Boys (N = 375) | Girls (N = 381) | |||
|---|---|---|---|---|
| n | Mean (SD) | n | Mean (SD) | |
| HC (cm) | ||||
| Birth | 363 | 34.6 (1.5) | 371 | 34.2 (1.4) |
| 3 months | 338 | 41.1 (1.4) | 355 | 40.1 (1.2) |
| 12 months | 335 | 46.9 (1.3) | 358 | 45.6 (1.2) |
| Developmental outcomes at 24 months | ||||
| Surgency/Extraversion | 330 | 4.0 (1.0) | 327 | 3.6 (1.0) |
| Negative Affect | 330 | 2.2 (0.6) | 327 | 2.3 (0.7) |
| Effortful control | 330 | 4.9 (0.7) | 327 | 5.0 (0.7) |
| Cognitive skills | 237 | 9.9 (2.0) | 235 | 10.0 (2.1) |
| Fine motor skills | 223 | 11.4 (2.6) | 222 | 11.7 (2.9) |
| Gross motor skills | 223 | 8.8 (2.1) | 222 | 9.3 (2.6) |
| M-CHAT | 330 | 0.8 (1.0) | 327 | 0.8 (1.0) |