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Characteristics of the participants (n = 398)
| Characteristics | Mean (SD) |
|---|---|
| Age at first walking (months) | 12.1 (2.1) |
| Age at cognitive tests (years) | 64.2 (3.0) |
| % | |
| Men | 43.2 |
| Father’s occupational status | |
| Upper middle | 8.8 |
| Lower middle | 23.5 |
| Manual worker | 67.7 |
| Attained education | |
| Upper tertiary | 11.8 |
| Lower tertiary | 23.4 |
| Upper secondary | 26.4 |
| Basic | 38.4 |
| Adult occupational status | |
| Higher official | 12.6 |
| Lower official | 45.5 |
| Self employed | 8.3 |
| Manual worker | 33.7 |
