Characteristics of the parents of the study infants
| Mother | Father | |
|---|---|---|
| Values in parentheses are percentages. | ||
| Education | ||
| No formal education | 114 (1.1) | 31 (0.3) |
| Primary school | 1179 (11.4) | 941 (9.1) |
| Secondary school | 7930 (76.7) | 7403 (71.6) |
| University | 1106 (10.7) | 1964 (19) |
| Occupation | ||
| Unemployed (including housewife) | 6152 (59.5) | 186 (1.8) |
| Professional | 352 (3.4) | 662 (6.4) |
| Non-manual worker | 3256 (31.5) | 3453 (33.4) |
| Manual worker | 579 (5.6) | 6038 (58.4) |
| Smoking | ||
| Non-smoker | 9584 (92.7) | 5945 (57.5) |
| Smoker | 755 (7.3) | 4394 (42.5) |
| • Quitted during pregnancy | 538 (5.2) | |
| • Continued to smoke during pregnancy | 217 (2.1) | |
| Alcohol consumption | ||
| Never | 10019 (96.9) | 7434 (71.9) |
| Social drinking | 248 (2.4) | 2429 (23.5) |
| Regular | 72 (0.7) | 476 (0.7) |