Relation of quartiles of BMI to asthma and atopy in children aged 4–17 years after adjusting for potential confounding factors3-150
| 1st quartile (reference) | 2nd quartile | 3rd quartile | 4th quartile | p value | |
| Asthma ever | 1.00 | 1.03 (0.83 to 1.28) | 1.22 (0.98 to 1.51) | 1.77 (1.44 to 2.19) | 0.0001 |
| Still asthma | 1.00 | 1.19 (0.92 to 1.54) | 1.36 (1.05 to 1.76) | 1.98 (1.54 to 2.53) | 0.0001 |
| Treated for asthma | 1.00 | 0.96 (0.77 to 1.20) | 1.19 (0.96 to 1.49) | 1.74 (1.41 to 2.15) | 0.0001 |
| Wheeze in past 12 months | 1.00 | 1.29 (1.09 to 1.53) | 1.02 (0.85 to 1.22) | 1.48 (1.24 to 1.76) | 0.0004 |
| Ever hay fever | 1.00 | 1.54 (1.19 to 2.01) | 1.63 (1.25 to 2.13) | 1.42 (1.08 to 1.88) | 0.02 |
| Still hay fever | 1.00 | 1.52 (1.17 to 1.99) | 1.53 (1.16 to 2.02) | 1.44 (1.09 to 1.92) | 0.02 |
| Treated for hay fever | 1.00 | 1.59 (1.19 to 2.11) | 1.74 (1.30 to 2.32) | 1.47 (1.09 to 1.99) | 0.02 |
| Atopy | 1.00 | 1.07 (0.91 to 1.27) | 1.20 (1.01 to 1.43) | 1.14 (0.96 to 1.35) | 0.08 |
| Eosinophilia | 1.00 | 1.10 (0.98 to 1.23) | 1.00 (0.89 to 1.13) | 1.04 (0.93 to 1.17) | 0.79 |
| Number of episodes of wheeze | 1.00 | 0.64 (0.45 to 0.93) | 0.79 (0.56 to 1.12) | 0.92 (0.66 to 1.29) | 0.87 |
| Emergency room visits | 1.0 | 1.02 (0.79 to 1.33) | 1.05 (0.81 to 1.38) | 1.46 (1.13 to 1.87) | 0.002 |
Values are odds ratios with 95% confidence intervals adjusted for sex, ethnicity, age, household size, study area, and passive smoke exposure.
↵3-150 A complete data set was not available for every subject.