Effects of changes in long-term air pollution (annual average) concentrations on changes in FeNO levels adjusted for changes in short-term concentrations
| Pollutant | Difference* (95% CI) |
|---|---|
| NO2 | 2.29 (0.36 to 4.21)† |
| PM2.5 | 4.94 (1.44 to 8.47)‡ |
| PM10 | 0.14 (−2.01 to 2.28) |
| O3 | 0.74 (−4.47 to 3.01) |
*Results are scaled to the IQR values of 1.8 ppb (NO2), 2.4 μg/m3 (PM2.5), 3.4 μg/m3 (PM10) and 2.1 ppb (O3) of changes in annual average pollution levels between the 2 years of study. Estimates are adjusted for short-term effects of the same air pollutant for years 5 and 6 of the study. Models are also adjusted for changes (or interactions with changes in age for time-independent covariates) in community, race/ethnicity, sex, asthma, asthma medication use, history of respiratory allergy, age, day of FeNO collection and season.
†p<0.05.
‡p<0.01.