ORs derived from logistic regression between (a) lung function, (b) symptoms and (c) exacerbations and one IQR of each pollutant
| n | OR (95% CI) | |
| a) Lung function (defined dichotomically as % predicted FEV1 value < or ≥80) | ||
| Crude | ||
| NO2 | 455 | 1.01 (0.73 to 1.42) |
| O3-an | 471 | 1.23 (0.88 to 1.73) |
| O3-sum | 471 | 1.53 (0.97 to 2.42) |
| PM10 | 471 | 1.48 (1.15 to 1.90) |
| Adjusted* | ||
| NO2 | 453 | 1.13 (0.78 to 1.65) |
| O3-an | 469 | 1.07 (0.73 to 1.58) |
| O3-sum | 469 | 1.35 (0.80 to 2.28) |
| PM10 | 469 | 1.46 (1.10 to 1.92) |
| b) Symptoms (defined as asthma attacks or dyspnoea or woken by an asthma attack or shortness of breath in the past 3 months) | ||
| Crude | ||
| NO2 | 465 | 0.91 (0.70 to 1.17) |
| O3-an | 481 | 1.39 (1.07 to 1.81) |
| O3-sum | 481 | 1.63 (1.15 to 2.30) |
| PM10 | 481 | 1.36 (1.13 to 1.65) |
| Adjusted* | ||
| NO2 | 454 | 0.97 (0.74 to 1.28) |
| O3-an | 470 | 1.29 (0.98 to 1.72) |
| O3-sum | 470 | 1.59 (1.10 to 2.30) |
| PM10 | 470 | 1.38 (1.12 to 1.69) |
| c) Exacerbations (defined at least one hospitalisations or ER visits in the last year or oral CI in the past 3 months) | ||
| Crude | ||
| NO2 | 463 | 0.91 (0.65 to 1.27) |
| O3-an | 479 | 1.09 (0.78 to 1.54) |
| O3-sum | 479 | 1.69 (1.07 to 2.66) |
| PM10 | 479 | 1.21 (0.95 to 1.54) |
| Adjusted* | ||
| NO2 | 452 | 1.05 (0.73 to 1.51) |
| O3-an | 468 | 0.94 (0.65 to 1.37) |
| O3-sum | 468 | 1.58 (0.97 to 2.59) |
| PM10 | 468 | 1.29 (0.99 to 1.67) |
Bold estimates make reference to estimates with a p<0.05.
↵* Adjusted for sex, age, body mass index, educational level, smoking and use of inhaled corticosteroids in the last year.
ER, emergency room; CI, corticosteroids.