| Median | IQR | Zero | 1–2 | 3–4 | 5+ | Cases | |
| Median | IQR | <5 | 5–9 | 10–19 | 20+ | Cases | |
| No of COPD exacerbations recorded in 12 months before index admission | 3 | 1–5 | 14% | 31% | 25% | 30% | 2204 |
| No of contacts with GP out-of-hours service in 12 months before index admission | 0 | 0–2 | 51% | 32% | 9% | 8% | 2164 |
| Times patient was seen in practice airways clinic in 12 months before index admission | 0 | 0–2 | 31% | 52% | 12% | 5% | 2122 |
| No of visits to practice in 4 weeks before admission | 1 | 0–3 | 26% | 43% | 21% | 10% | 2201 |
| No of contacts with or visits to practice in 12 months before index admission | 12 | 7–20 | 19% | 20% | 36% | 25% | 2215 |
COPD, chronic obstructive pulmonary disease; IQR, interquartile range.