Table 1 Characteristics of the study population in relation to FeNO categories
Variable | FeNO group | ||
|---|---|---|---|
Low FeNO | Intermediate FeNO | High FeNO | |
(< 25 ppba) | (25–49 ppb) | (≥ 50 ppb) | |
Individuals, n (%) | |||
345 (72.9) | 113 (23.9) | 15 (3.2) | |
Sex, n (%) | |||
Femaleb | 186 (53.9) | 30 (26.5) | 4 (26.7) |
Maleb | 159 (46.1) | 83 (73.5) | 11 (73.3) |
Smoking habits, n (%) | |||
Neverc | 238 (69.0) | 82 (72.6) | 12 (80.0) |
Previous | 51 (14.8) | 24 (21.2) | 1 (6.7) |
Current | 56 (16.2) | 7 (6.2) | 2 (13.3) |
Current asthma, n (%) | |||
Yes | 20 (5.8) | 7 (6.2) | 3 (20.0) |