Summary of exacerbations and presumed bacterial LRTIs for each cohort
| Under 5s | 5 to 17s | 18 to 54s | 55+ | |||||
| Patients (%) | Rate per 10 person-years (95% CI) | Patients (%) | Rate per 10 person-years (95% CI) | Patients (%) | Rate per 10 person-years (95% CI) | Patients (%) | Rate per 10 person-years (95% CI) | |
| Total cohort | 17 320 | 82 707 | 210 724 | 113 575 | ||||
| Exacerbations | 7574 | 4.27 (4.18 to 4.38) | 39 970 | 1.48 (1.47 to 1.50) | 245 077 | 3.22 (3.21 to 3.24) | 435 029 | 9.40 (9.37 to 9.42) |
| Patients who exacerbated | 3706 (21.4*) | 18 449 (22.3*) | 80 041 (38*) | 70 954 (62.5*) | ||||
| Annual exacerbation frequency | ||||||||
| ≤0.5 | 553 | 12 433 | 47 588 | 29 620 | ||||
| 0.5–1 | 1131 | 3600 | 17 423 | 16 439 | ||||
| 1.1–3 | 1577 | 2047 | 12 156 | 17 569 | ||||
| 3.1–6 | 369 | 292 | 2121 | 4419 | ||||
| >6 | 76 | 77 | 753 | 2907 | ||||
| Level of care | ||||||||
| GP only | 5211 | 26 543 | 155 054 | 334 850 | ||||
| A&E | 232 | 984 | 2257 | 561 | ||||
| Hospitalisation (<1 day) | 966 | 6515 | 46 227 | 50 385 | ||||
| Hospitalisation (≥1 day) | 1165 | 5925 | 41 502 | 49 015 | ||||
| Died | <5 | <5 | 37 | 218 | ||||
| Antibiotic-treated LRTIs | 2179 | 0.61 (0.58 to 0.64) | 11 488 | 0.22 (0.21 to 0.22) | 81 084 | 0.71 (0.71 to 0.72) | 171 352 | 1.93 (1.92 to 1.94) |
| Patients with Ax-LRTI | 1612 (9.3*) | 8252 (10*) | 41 874 (19.9*) | 34 656 (30.5*) | ||||
*Per cent of total cohort, ; annual frequency is the number of patients who exacerbated within each band of annual frequency.
A&E, Accident & Emergency; Ax-LRTI, antibiotic-treated lower respiratory tract infection; GP, general practitioner; LRTI, lower respiratory tract infection.