Prevalence of asthma, hay fever and atopy (%) in children aged 4–17 years across quartiles of Z scores of body mass index (BMI)2-150
| 1st quartile (n=1921) | 2nd quartile (n=1948) | 3rd quartile (n=1778) | 4th quartile (n=1720) | p value2-151 | |
| Asthma ever (n=668) | 8.7 | 9.3 | 10.3 | 14.9 | 0.0001 |
| Still asthma (n=463) | 5.6 | 6.8 | 7.3 | 10.8 | 0.0001 |
| Treated for asthma (n=636) | 8.6 | 8.7 | 10.05 | 14.5 | 0.0001 |
| Wheeze in past 12 months (n=1182) | 14.6 | 18.3 | 14.7 | 20.6 | 0.0002 |
| Ever hay fever (n=384) | 5.6 | 8.9 | 8.6 | 8.0 | 0.012 |
| Still hay fever (n=360) | 5.4 | 8.5 | 7.8 | 7.8 | 0.011 |
| Treated for hay fever (n=314) | 4.5 | 7.4 | 7.3 | 6.7 | 0.013 |
| Atopy (n=2480) | 48.6 | 50.5 | 53.0 | 53.2 | 0.05 |