Prevalence of risk factors of frequent asthma exacerbations in total study population and in patients included in the main analysis
| Total study population | Patients included in the main analysis | |
| Subjects n | 136 | 63 |
| Recurrent respiratory infections | 58.1 (50–66) | 61.9 (48–71) |
| Gastro-oesophageal reflux | 49.3 (41–58) | 49.2 (39–61) |
| Severe chronic sinus disease | 45.5 (36–55) | 500 (34–62) |
| Ongoing allergen exposure | 38.5 (30–47) | 35.0 (23–49) |
| Relative immune deficiency | 31.5 (19–44) | 33.3 (18–47) |
| Hormonal influences# | 30.0 (20–40) | 29.7 (17–44) |
| Occupational sensitisers | 27.9 (20–36) | 28.6 (18–39) |
| Psychological dysfunctioning | 20.4 (13–28) | 18.4 (12–31) |
| Poor inhaler technique | 20.4 (13–28) | 14.8 (10–32) |
| Obstructive sleep apnoea | 12.5 (7–18) | 6.3 (3–29) |
| Drugs | 9.6 (5–15) | 4.8 (2–24) |
| Food allergens | 9.4 (4–14) | 10.0 (3–16) |
| Hyperthyroidism | 1.5 (1–4) | 1.6 (1–6) |
Data are presented as % (95% confidence interval). #: n = 80.