Table 2 Sample characteristics, total and by frailty index (FI) category
|  | Total | Robust (FI < 0.1) | Pre-frail (FI 0.10–0.21) | Frail (FI > 0.21) |
|---|---|---|---|---|
N = 2,561 | N = 1,115 | N = 967 | n = 426 | |
Status | ||||
 Alive/censored | 2,156 (84.2%) | 994 (89.1%) | 816 (84.3%) | 306 (71.8%) |
 Deceased | 405 (15.8%) | 121 (10.9%) | 151 (15.6%) | 133 (27.8%) |
  CVD | 148 (5.8%) | 40 (3.6%) | 54 (5.6%) | 54 (11.3%) |
  Cancer | 127 (5.0%) | 48 (4.3%) | 51 (5.3%) | 28 (5.8%) |
  Other | 130 (5.1%) | 33 (3.0%) | 46 (4.8%) | 51 (10.6%) |
 Female sex | 1400 (54.7%) | 557 (50.0%) | 521 (53.9%) | 322 (67.2%) |
 Education: low | 726 (28.3%) | 234 (21.0%) | 266 (27.5%) | 226 (47.2%) |
 Education: medium | 1,313 (51.3%) | 619 (55.5%) | 498 (51.5%) | 196 (40.9%) |
 Education: high | 522 (20.4%) | 262 (23.5%) | 203 (21.0%) | 57 (11.9%) |
 Age: mean (SD) in years | 72.1 (5.8) | 71.2 (5.4) | 72.5 (5.7) | 73.7 (6.6) |
 Follow-up total sample: median (IQR) in years | 7.2 (0.9) | 7.2 (0.9) | 7.2 (0.9) | 7.2 (1.1) |
 Follow-up deceased: median (IQR) in years | 4.7 (3.4) | 4.7 (3.0) | 4.9 (3.1) | 4.2 (3.3) |