Characteristics of the schoolchildren having participated in the French 6 Cities Study
| Factors | All (n=6590) | Restricted sample (n=4643)* |
| Age (years) (mean±SD) | 10.4±0.7 | 10.4±0.7 |
| Sex (men) (%) | 49.3 | 49.2 |
| Weight (kg) (mean±SD) | 36.2±8.2 | 36.3±8.2 |
| Height (m) (mean±SD) | 1.42±0.08 | 1.42±0.08 |
| Body mass index (m/kg2) (mean±SD) | 17.9±2.9 | 17.9±2.9 |
| Peak flow (ml/min) (mean±SD) | 330.3±49.1 | 331.7±49.6 |
| Parental history of allergy (%) | 36.2 | 36.6 |
| Exposure to tobacco smoke (%) | 43.8 | 43.0 |
Body mass index: weight/height2.
↵* Underwent medical examination during the same week as air quality assessments.