Table 1.
Population Characteristics of UK Biobank Participants Who Had Any Accelerometer Data and Were Aged 50 or Older at Accelerometer Wear Time Stratified by Whether They Met the Inclusion Criteria (“Included”) or Were Excluded From Our Analysis (“Excluded”)
| Included | Excluded | |
|---|---|---|
| N = 82 304 | N = 12 562 | |
| Age at recruitment | 57.98 (6.83) | 57.33 (7.06) |
| Age at accelerometer wear | 63.69 (6.81) | 63.16 (6.99) |
| Race (% non-white) | 2155 (2.6) | 513 (4.2) |
| Body mass index (%) | ||
| Underweight | 450 (0.5) | 77 (0.6) |
| Normal | 31 591 (38.4) | 4437 (36.0) |
| Overweight | 34 373 (41.8) | 5043 (40.9) |
| Obese | 15 890 (19.3) | 2784 (22.6) |
| Self-reported overall health (%) | ||
| Good | 49 606 (60.3) | 7139 (57.9) |
| Excellent | 18 230 (22.1) | 2189 (17.7) |
| Fair | 12 478 (15.2) | 2529 (20.5) |
| Poor | 1990 (2.4) | 480 (3.9) |
| Cigarette smoker (%) | ||
| Never | 46 603 (56.6) | 6740 (54.8) |
| Previous | 30 318 (36.8) | 4559 (37.0) |
| Current | 5383 (6.5) | 1008 (8.2) |
| Alcohol (%) | ||
| Daily or almost daily | 19 625 (23.8) | 2917 (23.4) |
| 3–4 times a week | 21 674 (26.3) | 3125 (25.0) |
| Once or twice a week | 20 254 (24.6) | 3057 (24.5) |
| 1–3 times a month | 8585 (10.4) | 1311 (10.5) |
| Special occasions only | 7600 (9.2) | 1281 (10.3) |
| Never | 4566 (5.5) | 794 (6.4) |
| Heart attack (% yes) | 1357 (1.6) | 206 (1.7) |
| Stroke (% yes) | 805 (1.0) | 181 (1.5) |
| High blood pressure (% yes) | 19 762 (24.0) | 3157 (25.4) |
| Diabetes (% yes) | 2965 (3.6) | 485 (3.9) |
| Cancer (% yes) | 6304 (7.7) | 1070 (8.7) |
| Right-hand grip strength | 32.15 (10.94) | 31.38 (11.11) |
| Gait speed (%) | ||
| Steady average pace | 40 023 (48.6) | 6066 (49.5) |
| Slow pace | 3883 (4.7) | 799 (6.5) |
| Brisk pace | 38 398 (46.7) | 5395 (44.0) |
| Illness or injury in the past 2 years (% yes) | 6657 (8.1) | 1224 (10.4) |
| Longstanding illness or disability (% yes) | 23 835 (29.0) | 3548 (33.2) |
| Mortality (% deceased) | 1959 (2.4) | 366 (2.9) |
Note: For continuous variables, group-specific averages and SDs (in parentheses) are shown. For categorical variables, the number of individuals within each category and percentages (in parentheses) are shown. Exclusion was based on missing data in any variable while summaries in the “Excluded” column are based on all available data for each variable.