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) |