Characteristics of cases with pneumonia and age–sex–practice–calendar year-matched controls.
| Characteristics | Cases (n = 17 172) | Controls (n = 71 399) | Adjusteda OR (95% CI) |
|---|---|---|---|
| Sex, n (%) | |||
| Males | 8714 (50.7) | 36338 (50.9) | |
| Females | 8458 (49.3) | 35061 (49.1) | |
| Age band, years, n (%) | |||
| 0–4 | 2949 (17.2) | 13934 (19.5) | |
| 5–14 | 811 (4.7) | 3028 (4.2) | |
| 15–44 | 2173 (12.7) | 7450 (10.4) | |
| 45–64 | 3124 (18.2) | 12905 (18.1) | |
| 65–74 | 2662 (15.5) | 11597 (16.2) | |
| ≥75 | 5453 (31.8) | 22485 (31.5) | |
| Median (IQR) months of electronic data available | 83 (65–111) | 83 (64–111) | |
| Deprivation, n (%) | |||
| Townsend fifth 1 most affluent | 3322 (19.3) | 14945 (20.9) | 1.00 |
| Townsend fifth 2 | 3269 (19.0) | 14593 (20.4) | 1.00 (0.95 to 1.06) |
| Townsend fifth 3 | 3303 (19.2) | 13665 (19.1) | 1.08 (1.02 to 1.15) |
| Townsend fifth 4 | 3224 (18.8) | 12449 (17.4) | 1.18 (1.11 to 1.25) |
| Townsend fifth 5 most deprived | 3553 (20.7) | 13123 (18.4) | 1.27 (1.19 to 1.36) |
| Townsend missing | 501 (2.9) | 2624 (3.7) | |
| Smoking status,b n (%) | |||
| Non-smoker | 11999 (69.9) | 52367 (73.3) | 1.00 |
| Smoker | 3299 (19.2) | 8883 (12.4) | 1.61 (1.53 to 1.69) |
| Smoking status not recorded | 1875 (10.9) | 10158 (14.2) | |
| Influenza vaccination in prior 12 months, n (%) | 6535 (38.1) | 23997 (33.6) | 1.39 (1.32 to 1.46) |
| Pneumococcal vaccination in prior 60 months, n (%) | 2821 (16.4) | 10263 (14.4) | 1.08 (1.02 to 1.14) |