Table 2.
Developmental outcomes of children at 2 years of age by child sex
| Total | Female | Male | P value | |
| Sample | n=625 | n=303 | n=322 | |
| Cognitive scores, mean (SD) | 85.74 (8.84) | 86.44 (8.56) | 85.08 (9.06) | 0.035 |
| Cognitive categories | ||||
| No delay, n (%) | 424 (68) | 218 (72) | 206 (64) | 0.078 |
| Suboptimal development, n (%) | 173 (28) | 75 (25) | 98 (30) | |
| Delayed, n (%) | 28 (4) | 10 (3) | 18 (6) | |
| Sample | n=598 | n=289 | n=309 | |
| Language scores, mean (SD) | 84.45 (11.39) | 86.57 (11.35) | 82.47 (11.08) | <0.001 |
| Language categories | ||||
| No delay, n (%) | 297 (50) | 164 (57) | 133 (43) | 0.001 |
| Suboptimal development, n (%) | 253 (42) | 110 (38) | 143 (46) | |
| Delayed, n (%) | 48 (8) | 15 (5) | 33 (11) | |
| Sample | n=592 | n=289 | n=303 | |
| Motor scores, mean (SD) | 93.62 (11.89) | 94.40 (12.12) | 92.86 (11.63) | 0.111 |
| Motor categories | ||||
| No delay, n (%) | 490 (83) | 243 (84) | 247 (82) | 0.251 |
| Suboptimal development, n (%) | 95 (16) | 41 (14) | 54 (18) | |
| Delayed, n (%) | 7 (1) | 5 (2) | 2 (1) | |
Continuous composite scores are presented as mean (SD). Categorical data presented as frequencies (percentages). Categories were defined as ‘delay’ (<2 SD below mean), ‘suboptimal development’ (<1 SD below mean) and ‘no delay’. P values presented are comparing sex differences.