Grass pollen >10 grains/m3 | Poor air quality* | FEV1 (mL) n=973 | FVC (mL) n=973 | ||
aβ (95% CI) | aβ (95% CI) | ||||
Group 1 | No | No | Reference | Reference | |
Group 2 | No | Yes | 7.7 (−20.9 to 36.3) | 8.3 (−26.1 to 42.6) | |
Group 3 | Yes | No | −19.9 (−55.7 to 15.9) | −41.0 (−84.1 to 2.1) | |
Group 4 | Yes | Yes | −70.2 (−129.7 to −10.7) | −92.5 (−164.1 to −20.9) |
Grass pollen >10 grains/m3 | Poor air quality* | FEV1/FVC (%) n=973 | FeNO>20 ppb n=866 | ||
aβ (95% CI) | n/N | aOR (95% CI) | |||
Group 1 | No | No | Reference | 86/446 | Reference |
Group 2 | No | Yes | −0.1 (−1.0 to 0.7) | 55/227 | 1.38 (0.90 to 2.11) |
Group 3 | Yes | No | 0.8 (−0.3 to 1.8) | 26/153 | 0.70 (0.40 to 1.24) |
Group 4 | Yes | Yes | 0.9 (−0.9 to 2.6) | 8/40 | 0.81 (0.33 to 2.03) |
All models were adjusted for sex, age and height at the health check-up, ethnicity, family SES, exposure to environmental tobacco smoke at home at 8 years of age, current asthma and average ambient temperature and relative humidity the day before the health check-up. The estimates in bold differ significantly from the reference (p<0.05). Total N for each model may vary due to missing information.
*Poor air quality was defined as an air quality index ATMO ≥6 (on a scale of 1 to 10) based on the daily average air concentrations of PM10, NO2, O3 and SO2.
aβ, adjusted regression coefficient; aOR, adjusted OR; FeNO, fraction of exhaled nitric oxide; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; NO2, nitrogen dioxide; O3, ozone; PM10, particulate matter with aerodynamic diameter <10 µm; SO2, sulphur dioxide.