Association between BHR and categories of physical activity by logistic regression
| Physical activity | Bronchial hyperresponsiveness (BHR) | |
|---|---|---|
| Crude OR (95% CI) | Adjusted OR* (95% CI) | |
| *Adjusted for country, sex, age, body mass index, smoking, education level, specific IgE to each allergen and total IgE, asthma-like symptoms, current asthma, family history of asthma and residual forced expiratory volume in 1 s. | ||
| †Exercising ⩾2 times/week and ⩾1 h vs the rest. | ||
| Usual frequency of exercise | ||
| ⩽1 time/week | 1.00 (reference) | 1.00 (reference) |
| 2–3 times/week | 0.70 (0.57 to 0.86) | 0.78 (0.62 to 0.99) |
| ⩾4 times/week | 0.72 (0.56 to 0.94) | 0.69 (0.50 to 0.94) |
| Usual duration of exercise | ||
| <1 h/week | 1.00 (reference) | 1.00 (reference) |
| 1–3 h/week | 0.65 (0.54 to 0.77) | 0.70 (0.57 to 0.87) |
| >3 h/week | 0.63 (0.50 to 0.81) | 0.67 (0.50 to 0.90) |
| Combined† | ||
| Inadequately active | 1.00 (reference) | 1.00 (reference) |
| Active | 0.70 (0.59 to 0.83) | 0.74 (0.60 to 0.92) |