Table 1.
Sample characteristics ( N = 4914)
| Child characteristics | N | Missing N (%) | ||
|---|---|---|---|---|
| Mean (SD) gestational age at birth (weeks) |
4896 |
39.8 (1.8) |
18 (0.3) |
|
| Mean (SD) birth weight (g) |
4609 |
3441 (568) |
305 (6.2) |
|
| Mean (SD) BMI around 4 years1 |
3117 |
15.8 (1.3) |
1797 (36.6) |
|
| Sex |
% girl |
2458 |
50.0 |
0 |
| Ethnicity |
% non-Western |
1188 |
24.4 |
39 (0.7) |
| Firstborn |
% yes |
2789 |
56.8 |
0 |
| Only child at age 4 years |
% yes |
1042 |
21.6 |
82 (1.7) |
| Daycare attendance at 3 years |
% at least 8 h/week |
3338 |
77.1 |
582 (11.8) |
|
Family characteristics |
|
|
|
|
| Mean (SD) maternal age at enrolment (years) |
4914 |
31.5 (4.6) |
0 |
|
| Mean (SD) BMI mother before pregnancy |
3703 |
23.3 (3.9) |
1211 (24.6) |
|
| Mean (SD) BMI partner before pregnancy |
3634 |
25.2 (3.3) |
1280 (26.0) |
|
| Marital status |
% single |
370 |
7.9 |
237 (4.8) |
| Household income |
% < 2200€/month |
1321 |
32.4 |
833 (17.0) |
| Maternal education |
% less than college |
1979 |
42.1 |
210 (4.3) |
| Smoking during pregnancy | % yes | 944 | 21.4 | 501 (10.2) |