Table 1 Baseline characteristics for included and remaining UK Biobank sample
Characteristic | Included (n = 60,235) | Remaining sample (n = 442,278) |
|---|---|---|
Age, mean (SD) | 55.9 (7.7) | 56.6 (8.1) |
Sex | ||
 Female | 33,739 (56%) | 239,649 (54%) |
 Male | 26,496 (44%) | 202,629 (46%) |
Ethnicity | ||
 White | 58,649 (98%) | 414,054 (94%) |
 Mixed | 282 (0.5%) | 2676 (0.6%) |
 South Asian | 409 (0.7%) | 9473 (2.2%) |
 Black | 373 (0.6%) | 7688 (1.7%) |
 Chinese | 108 (0.2%) | 1466 (0.3%) |
 Other | 281 (0.5%) | 4277 (1.0%) |
Household income | ||
 Less than 18,000 | 8102 (13%) | 89,100 (24%) |
 18,000 to 30,999 | 14,200 (24%) | 93,977 (26%) |
 31,000 to 51,999 | 17,402 (29%) | 93,371 (26%) |
 52,000 to 100,000 | 15,745 (26%) | 70,522 (19%) |
 Greater than 100,000 | 4786 (7.9%) | 18,144 (5.0%) |
Education | ||
 College or University degree | 28,844 (48%) | 132,321 (31%) |
 A levels/AS levels or equivalent | 8237 (14%) | 47,086 (11%) |
 O levels/GCSEs or equivalent | 11,533 (19%) | 93,666 (22%) |
 CSES or equivalent | 2036 (3.4%) | 24,851 (5.8%) |
 NVQ or HND or HNC or equivalent | 2962 (4.9%) | 29,767 (6.9%) |
 Other professional qualifications e.g., nursing, teaching | 2950 (4.9%) | 22,854 (5.3%) |
 None | 3673 (6.1%) | 81,600 (19%) |
Smoking status | ||
 Never | 34,847 (58%) | 238,678 (54%) |
 Previous | 21,436 (36%) | 151,624 (35%) |
 Current | 3952 (6.6%) | 49,027 (11%) |
BMI, mean (SD) | 26.6 (4.5) | 27.6 (4.8) |
Long-term physical illness | ||
 Do not know | 962 (1.6%) | 10,425 (2.4%) |
 No | 43,003 (71%) | 286,253 (65%) |
 Yes | 16,270 (27%) | 143,630 (33%) |
Diet | 4.94 (2.48) | 4.88 (2.80) |
Baseline depression and anxiety symptoms, mean (SD) | 1.34 (1.80) | 1.64 (2.11) |
Parental depression | ||
 No | 54,430 (90%) | 383,357 (91%) |
 Yes | 5805 (9.6%) | 36,752 (8.7%) |
Daily sedentary behaviour, arithmetic mean minutes (SD) | 647.8 (99.2) | - |
Daily light activity, mean arithmetic minutes (SD) | 292.4 (62.7) | - |
Daily moderate-to-vigorous arithmetic activity, mean minutes (SD) | 65.1 (37.1) | - |
Daily sleep, arithmetic mean minutes (SD) | 434.8 (58.4) | - |
Sedentary behaviour, geometric mean | 0.45 | - |
Light activity, geometric mean | 0.20 | - |
Moderate-to-vigorous activity, geometric mean | 0.05 | - |
Sleep, geometric mean | 0.30 | - |