Characteristics and representativeness of included controls
| Characteristic | Included controls(n = 339) | Index controls(n = 435) |
|---|---|---|
| Mean (SD) age | 65.5 (9.4) | 65.0 (9.6) |
| Median (IQR) Townsend score of enumeration district of current residence | −1.86(−3.57 to 2.39) | −1.14(−3.25 to 3.57) |
| Exposure zone of current residence (%) | ||
| Zone A | 17 | 17 |
| Zone B | 44 | 43 |
| Zone C | 39 | 38 |