Characteristics of subjects in the external validation sample (derived from 20 general practices)
| Controls (n=4196) | Cases (n=2259) | |||
|---|---|---|---|---|
| N | (%) | N | (%) | |
| Mean age (SD) | 69.8 | (11.0) | 70.0 | (11.1) |
| Males | 2110 | (50.3) | 1133 | (50.2) |
| Socioeconomic quintile* | ||||
| 1 | 475 | (11.3) | 258 | (11.4) |
| 2 | 561 | (13.4) | 313 | (13.9) |
| 3 | 1072 | (25.5) | 574 | (25.4) |
| 4 | 308 | (7.3) | 159 | (7.0) |
| 5 | 1780 | (42.4) | 955 | (42.3) |
| Smoking status | ||||
| Never | 1858 | (44.3) | 374 | (16.6) |
| Former | 799 | (19.0) | 674 | (29.8) |
| Current | 751 | (17.9) | 966 | (42.8) |
| Missing | 788 | (18.8) | 245 | (10.8) |
| Body mass index | ||||
| <18.5 | 1234 | (29.4) | 623 | (27.6) |
| 18.5–25 | 1098 | (26.2) | 643 | (28.5) |
| 25–30 | 1246 | (29.7) | 624 | (27.6) |
| >30 | 618 | (14.7) | 369 | (16.3) |
*1=least deprived, 5=most deprived. Based on the Index of Multiple Deprivation score of electoral ward,