| Infant sex (n, %): |
289 (53.3) | female |
253 (46.7) | male |
| Parity (n, %): |
313 (57.7) | 1st |
229 (42.3) | >1st |
| Mother education (n, %): |
315 (58.1) | High school or less |
227 (41.9) | university |
| Employment status (n, %): |
369 (68.1) | House wife |
172 (31.7) | Employed |
27.74 ± 4.9, 17 - 43 | Mothers’ ageing years (mean ± SD, range) |