Table 1 Population characteristics in relation to parental smoking
total n = 3,564 | no parent smokes n = 2,759 | at least one parent smokes n = 805 | ||
|---|---|---|---|---|
mean birth weight of the child (gr.) | 3515 (543) | 3536 (534) | 3444 (568) | * |
mean age of the mother (sd) | 30.5 (3.8) | 30.6 (3.8) | 30.2 (4.1) | * |
mean age of the father (sd) | 32.8 (4.5) | 32.9 (4.5) | 32.7 (4.7) | |
male gender of the child (%) | 51.7 | 51.8 | 51.2 | |
mean number of older siblings | 0.70 (0.87) | 0.69 (0.87) | 0.74 (0.87) | |
% breastfed for at least 8 weeks | 60.9 | 65.1 | 46.6 | * |
% with allergic mother | 28.9 | 29.9 | 25.5 | * |
% with allergic father | 30.5 | 32.2 | 24.7 | * |
education mother (%) | ||||
low (level 1 or 2) | 12.1 | 9.2 | 22.0 | * |
middle (level 3,4 or 5) | 52.0 | 50.4 | 57.4 | * |
high (level 6 or 7) | 35.1 | 39.7 | 19.4 | * |
education father (%) | ||||
low (level 1 or 2) | 18.4 | 15.5 | 28.1 | * |
middle (level 3,4 or 5) | 40.4 | 38.8 | 45.8 | * |
high (level 6 or 7) | 39.4 | 44.0 | 23.6 | * |
ethnicity mother (%) | ||||
born in Netherlands and Dutch ethnicity | 92.4 | 92.6 | 91.8 | |
born in Western country and Dutch or Western ethnicity | 1.9 | 2.0 | 1.6 | |
not born in Western country or non-Western ethnicity | 3.2 | 3.0 | 4.1 | |
ethnicity father (%) | ||||
born in Netherlands and Dutch ethnicity | 91.1 | 91.8 | 88.5 | * |
born in Western country and Dutch or Western ethnicity | 1.8 | 1.7 | 2.2 | |
not born in Western country or non-Western ethnicity | 4.4 | 3.8 | 6.3 | * |