Trends in potential explanatory variables from 1982 to 1994 in the representative sample children aged 8 or 9 years1-150 with information on symptoms
| Variable | Boys | Girls |
|---|---|---|
| Linear increase per year (95% confidence interval) | ||
| Body mass index SDS | 0.011 (0.006 to 0.016) | 0.009 (0.014 to 0.024) |
| Triceps skinfold SDS | 0.012 (0.007 to 0.016) | 0.008 (0.003 to 0.013) |
| Birth weight (g) | 0.78 (–3.70 to 2.18) | 2.75 (–0.19 to 5.69) |
| Birth weight for gestational age SDS | 0.001 (–0.005 to 0.007) | 0.010 (0.004 to 0.006) |
| Number of older siblings | 0.01 (0.01 to 0.02) | 0.01 (0.00 to 0.02) |
| Total number of siblings | 0.02 (0.01 to 0.02) | 0.02 (0.01 to 0.02) |
| Parental smoking: cigarettes per day | –0.07 (–0.14 to –0.01) | –0.03 (–0.09 to 0.04) |
| Odds ratio per year (95% confidence interval) | ||
| Mother smoked in pregnancy with child | 1.01 (0.99 to 1.02) | 1.01 (0.99 to 1.02) |
↵1-150 Selected by year of birth as detailed in text.