Table 1 Characteristics of PreFIT model development and validation cohorts
|  | Control arm N = 3,223 | Postal screener responders N = 5,779 | |
Mean (SD), [missing] | |||
 Age (years) | 77.9 (5.7) | 78.0 (5.7) | |
 Body Mass Index (kg/m2) | 26.4 (4.7) [104] | 26.4 (4.5) [182] | |
 Age left full-time education (years) | 16.8 (4.6) [50] | 16.8 (4.7) [83] | |
 Clock Draw Test (0–6) | 5.5 (0.9) [47] | 5.6 (0.9) [105] | |
Age band, N (%) | |||
 70–79 | 2,140 (66.4) | 3,883 (67.2) | |
 80–89 | 992 (30.8) | 1,707 (29.5) | |
 90–101 | 91 (2.8) | 189 (3.3) | |
Gender, N (%) | Â | Â | |
 Male | 1,557 (48.3) | 2,728 (47.2) | |
 Female | 1,666 (51.7) | 3,051 (52.8) | |
Living arrangement, N (%) | |||
 Lives alone | 1,048 (32.5) | 1,906 (33.0) | |
 Lives with others | 2,155 (66.9) | 3,842 (66.5) | |
 Missing | 20 (0.6) | 31 (0.5) | |
GP Deprivation, N (%) | |||
 Deprived (1–3) | 603 (18.7) | 1,125 (19.5) | |
 Moderate (4–7) | 1,566 (48.6) | 2,490 (43.1) | |
 Affluent (8–10) | 1,054 (32.7) | 2,164 (37.4) | |
Clock Draw test, N (%) | |||
 0–3 (poor) | 152 (4.7) | 235 (4.1) | |
 4–5 (moderate) | 761 (23.6) | 1,334 (23.1) | |
 6 (excellent) | 2,263 (70.2) | 4,105 (71.0) | |
 Missing | 47 (1.5) | 105 (1.8) | |
Difficulty with ADLsa, N (%), [missing] | |||
 Taking a bath | 464 (14.4) [155] | 855 (14.8) [291] | |
 Getting to the toilet | 25 (0.8) [120] | 31 (0.5) [156] | |
 Dressing | 51 (1.6) [107] | 52 (0.9) [134] | |
Strawbridge Frailty Indexb, N (%) | |||
 Not frail | 2,535 (78.6) | 4,560 (78.9) | |
 Frail | 647 (20.1) | 1,146 (19.8) | |
 Missing | 41 (1.3) | 73 (1.3) | |
SF-12c, mean (SD), [missing] | |||
 Physical component score | 50.3 (10.2) [320] | 50.5 (10.3) [540] | |
 Mental component score | 50.2 (9.3) [320] | 50.5 (8.9) [540] | |
Balance difficulties, level surface, N (%) | |||
 Never/Sometimes | 2,923 (90.7) | 5,288 (91.5) | |
 Often/Very often/Always | 280 (8.7) | 467 (8.1) | |
 Missing | 20 (0.6) | 24 (0.4) | |
Falls in last 12Â months, N (%) | |||
 No fall | 2,179 (67.6) | 3,917 (67.8) | |
 Single fall | 466 (14.5) | 845 (14.6) | |
 > 1 fall | 500 (15.5) | 920 (15.9) | |
 Missing | 78 (2.4) | 97 (1.7) | |
Fall-related fracture in last 12Â months, N (%) | |||
 Yes | 106 (3.3) | 183 (3.2) | |
 No | 3,076 (95.4) | 5,534 (95.8) | |
 Missing | 41 (1.3) | 62 (1.0) | |
Risk of falling, baselined N (%) | |||
 Low | 1,839 (57.0) | 3,,273 (56.6) | |
 Intermediate | 882 (27.4) | 1581 (27.4) | |
 High | 500 (15.5) | 920 (15.9) | |
 Missing | 2 (0.1) | 5 (0.1) | |