Table 1 Characteristics of the study population (n = 3,819)
From: Genetic susceptibility to airway inflammation and exposure to short-term outdoor air pollution
| Â | N (%) |
|---|---|
Sex | |
 Female; n (%) | 1,947 (51.0%) |
 Male; n (%) | 1,872 (49.0%) |
Age (years); mean ± SD | 51.4 (11.3) |
Height (centimeters); mean ± SD | 172.9 (9.2) |
Smoking | |
 Never; n (%) | 2,111 (55.3%) |
 Former; n (%) | 1,708 (44.7%) |
Asthma; n (%) | 253 (6.7%) |
Atopy; n (%) | 936 (24.5%) |
Current cold; n (%) | 357 (9.4%) |
FeNO50 (ppb) (n = 3,780) | |
 25th percentile | 12.9 |
 50th percentile | 17.5 |
 75th percentile | 24.2 |
FeNO270 (ppb) (n = 3,546) | |
 25th percentile | 4.2 |
 50th percentile | 5.6 |
 75th percentile | 7.26 |