Relationship between ECRHS “slope”* of bronchial hyperresponsiveness (BHR) and levels of physical activity by multivariable linear regression
| Physical activity in model | Adjusted† regression coefficient (95% CI) | p Value for regression coefficient |
|---|---|---|
| *Increasing “slope” indicates decreasing BHR. | ||
| †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 | 0 (reference) | |
| 2–3 times/week | 0.146 (0.003 to 0.289) | 0.046 |
| ⩾4 times/week | 0.231 (0.047 to 0.414) | 0.014 |
| Usual duration of exercise | ||
| <1 h/week | 0 (reference) | |
| 1–3 h/week | 0.160 (0.024 to 0.300) | 0.021 |
| >3 h/week | 0.266 (0.087 to 0.445) | 0.004 |
| Combined‡ | ||
| Inadequately active | 0 (reference) | |
| Active | 0.220 (0.094 to 0.346) | <0.001 |