Table 2.
Descriptive characteristics of the main analysis sample compared with all individuals in UK Biobank at baseline who have not since withdrawn from the study
| Variable | Analysis sample |
Full UK Biobank |
|||
|---|---|---|---|---|---|
| (N = 320 120) |
(N = 502 156) |
||||
| Continuous variables | N | Mean (SD) | N | Mean (SD) | |
| Age | 320 120 | 56.66 (8.00) | 502 156 | 56.54 (8.09) | |
| Drinks per week | 318 300 | 8.17 (9.05) | 497 917 | 7.79 (9.05) | |
| Body mass index | 319 201 | 27.3 (4.72) | 499 065 | 27.43 (4.8) | |
| Low-density lipoprotein cholesterol | 304 700 | 3.61 (0.86) | 468 390 | 3.56 (0.87) | |
| Systolic blood pressure | 292 277 | 138.16 (18.58) | 456 647 | 137.79 (18.62) | |
| Smoking (lifetime behaviour) | 301 684 | 0.32 (0.66) | 318 112 | 0.34 (0.67) | |
| Categorical variables | N | Frequency (%) | N | Frequency (%) | |
| Sex | Female | 320 120 | 175 108 (55) | 502 156 | 273 025 (54) |
| Years of education | 7 years | 320 120 | 52 012 (16) | 493 033 | 84 648 (17) |
| 10 years | 54 899 (17) | 82 357 (17) | |||
| 13 years | 17 355 (5) | 26 857 (5) | |||
| 15 years | 39 144 (12) | 58 271 (12) | |||
| 19 years | 51 418 (16) | 77 668 (16) | |||
| 20 years | 105 292 (33) | 163 232 (33) | |||
| Atrial fibrillation (incident) | Control | 316 912 | 307 352 (97) | 495 772 | 480 007 (97) |
| Case | 9560 (3) | 15 765 (3) | |||
| Coronary artery disease (incident) | Control | 317 055 | 302 574 (95) | 481 533 | 458 689 (95) |
| Case | 14 481 (5) | 22 844 (5) | |||
| Type 2 diabetes (incident) | Control | 316 406 | 305 327 (96) | 492 726 | 472 098 (96) |
| Case | 11 079 (4) | 20 628 (4) | |||
| Stroke (incident) | Control | 320 120 | 314 191 (98) | 497 151 | 487 084 (98) |
| Case | 5929 (2) | 10 067 (2) | |||