TABLE 1.
Description of study sample#
| Mean±sd | Median (IQR) | Range | n (%) | |
| Continuous variables | ||||
| Age years | 48.9±13.9 | 49.5 (40–59) | 19–76 | |
| Periostin ng·mL−1 | 57.3±18.6 | 54.0 (45.1–65.6) | 15.0–164.7 | |
| Pre-bronchodilator FEV1 L | 2.97±0.97 | 2.93 (2.36–3.60) | 0.50–5.86 | |
| Salbutamol reversibility % | 10.0±11.8 | 6.8 (3.2–12.5) | −10.7–121.9 | |
| KCO % pred | 99.2±17.5 | 100.6 (90.6–109.2) | 34.5–143.4 | |
| FeNO ppb | 33.7±35.2 | 21.9 (13.5–39.5) | 2.7–262.8 | |
| IgE IU·L−1 | 342.7±1162 | 81.1 (20.7–247) | 0.1–18 083 | |
| Eosinophil ×109·L−1 | 0.2±0.19 | 0.2 (0.1–0.3) | 0.0–1.5 | |
| ACQ-7 | 0.89±0.77 | 0.71 (0.29–1.29) | 0–3.86 | |
| SGRQ | 23.7±16.7 | 19.5 (10.4–35.0) | 0–84.1 | |
| Categorical variables | ||||
| Males | 179 (46.4) | |||
| ICS in past 12 months | 140 (36.3) | |||
| Doctor-diagnosed asthma | 285 (73.8) | |||
| Doctor-diagnosed COPD | 17 (4.4) | |||
| Smoking status | ||||
| Current | 58 (15.0) | |||
| Ex | 132 (34.2) | |||
| Never | 196 (50.8) |
IQR: interquartile range; FEV1: forced expiratory volume in 1 s; KCO: transfer coefficient of the lung for carbon monoxide; FeNO: exhaled nitric oxide fraction; ACQ-7: seven point Asthma Control Questionnaire; SGRQ: St George's Respiratory Questionnaire; ICS: inhaled corticosteroids; COPD: chronic obstructive pulmonary disease. #: n=386.