TABLE 1.
Baseline characteristics and the number of visits per group
| Healthy (n = 12) | Asthma (n = 12) | |
|---|---|---|
| Sex (female) | 7 (58%) | 8 (67%) |
| Age (years) | 21 (±1.5) | 22.2 (±2.2) |
| Ethnicity (Caucasian) | 11 (92%) | 9 (75%) |
| BMI (kg/m2) | 22.2 (±1.6) | 22.8 (±3.1) |
| Smoking (pack years) | 1 (± 0.17) | – |
| Baseline spirometry | ||
| FEV1% of predicted | 106 (±12) | 101 (±10) |
| FVC % of predicted | 104 (±11) | 104 (±10) |
| PEF % of predicted | 108 (±14) | 105 (±12) |
| FeNO (ppb) | 14 (12–21)* | 45 (30–63)* |
| Number of visits (mean; range) | ||
| Total | 34 (30–40) | 35 (33–38) |
| Before challenge | 23 (20–29) | 23 (21–26) |
| After challenge | 11 (10–12) | 12 (10–16) |
Data are presented as mean (±SD), median (IQR), n (%) or else when stated, and have partly been published previously.18 BMI, body mass index; FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; PEF, peak expiratory flow; FeNO, fractional exhaled nitric oxide. Differences in the number of visits were due to personal reasons (ie, missing visits) or when there was a delay in the RV16 challenge due to logistical reasons (ie, extra visits). * Significant difference (p < .01).