Table 1 Characteristics of the study population of the original dataset and the imputed datasets.
Baseline population Original data | Baseline population Imputed data | ||
|---|---|---|---|
% | N | % (n = 3,963) | |
Maternal educational level | 3,807 | ||
Low | 23.5 | 23.8 | |
Intermediate | 41.6 | 41.7 | |
High | 35.0 | 34.5 | |
Sex | 3,963 | ||
Female | 48.1 | 48.1 | |
Male | 51.9 | 51.9 | |
Older sibling(s) | 3,937 | ||
Yes | 50.7 | 50.6 | |
No | 49.4 | 49.4 | |
Maternal smoking during pregnancya | 3,904 | ||
Yes | 17.8 | 17.9 | |
No | 82.2 | 82.1 | |
Breastfeeding duration | 3,896 | ||
No breastfeeding | 17.9 | 18.0 | |
1-16 weeks | 49.6 | 49.7 | |
>16 weeks | 32.5 | 32.3 | |
Smoking in the home | 3,935 | ||
Yesb | 28.7 | 28.7 | |
No | 71.3 | 71.3 | |
Day-care centre attendance | 3,796 | ||
>= 4 hours per week | 24.4 | 24.2 | |
<4 hours per week | 75.6 | 75.9 | |
Eczema at age 8 | 16.0 | 3,233 | 16.4 |
Asthma symptoms at age 8 | 13.0 | 3,308 | 13.8 |
Poor general health at age 8 | 24.6 | 3,229 | 26.0 |
Freq. respiratory infections at age 8 | 3.9 | 3,247 | 4.3 |
Overweight at age 8c | 11.6 | 2,607 | 12.0 |
Obesity at age 8 | 2.0 | 2,607 | 2.3 |
Mean/SD d | Mean/SD d | ||
Maternal age (years) | 30.3/3.9 | 3,920 | 30.3/3.9 |
Birthweight child (grams) | 3,507/546 | 3,914 | 3,507/546 |