Table 1.
Baseline characterization of participants in UKB.
| Variable | Overall, N = 53,016 |
female, N = 28,581 |
male, N = 24,435 |
p-value1 |
|---|---|---|---|---|
| Age_when_attended, Mean (SD) | 56.81 (8.21) | 56.61 (8.10) | 57.04 (8.33) | <0.001 |
| BMI, Mean (SD) | 27.47 (4.80) | 27.16 (5.22) | 27.85 (4.24) | <0.001 |
| smoking_status, n (%) | <0.001 | |||
| current | 5,637 (11%) | 2,559 (9.0%) | 3,078 (13%) | |
| previous | 18,568 (35%) | 9,027 (32%) | 9,541 (39%) | |
| never | 28,811 (54%) | 16,995 (59%) | 11,816 (48%) | |
| Alcohol_intake_frequency, n (%) | <0.001 | |||
| never | 4,604 (8.7%) | 2,888 (10%) | 1,716 (7.0%) | |
| occasionally | 12,058 (23%) | 8,097 (28%) | 3,961 (16%) | |
| sometimes | 25,656 (48%) | 13,041 (46%) | 12,615 (52%) | |
| Daily | 10,698 (20%) | 4,555 (16%) | 6,143 (25%) | |
| Summed_MET, Mean (SD) | 2,651.18 (2,653.68) | 2,567.43 (2,510.17) | 2,749.14 (2,809.15) | 0.001 |
| Townsend, Mean (SD) | -1.18 (3.19) | -1.22 (3.12) | -1.13 (3.26) | 0.2 |
| education, n (%) | <0.001 | |||
| College or University degree | 17,025 (32%) | 8,804 (31%) | 8,221 (34%) | |
| A levels/AS levels or equivalent | 5,839 (11%) | 3,379 (12%) | 2,460 (10%) | |
| O levels/GCSEs or equivalent | 10,994 (21%) | 6,535 (23%) | 4,459 (18%) | |
| CSEs or equivalent | 2,837 (5.4%) | 1,546 (5.4%) | 1,291 (5.3%) | |
| NVQ or HND or HNC or equivalent | 3,518 (6.6%) | 1,307 (4.6%) | 2,211 (9.0%) | |
| Other professional qualifications | 2,813 (5.3%) | 1,715 (6.0%) | 1,098 (4.5%) | |
| None of the above | 9,383 (18%) | 4,997 (17%) | 4,386 (18%) | |
| Prefer not to answer | 607 (1.1%) | 298 (1.0%) | 309 (1.3%) | |
| income, n (%) | <0.001 | |||
| Less_than_18,000 | 13,848 (26%) | 7,942 (28%) | 5,906 (24%) | |
| 18,000_to_30,999 | 13,975 (26%) | 7,781 (27%) | 6,194 (25%) | |
| 31,000_to_51,999 | 12,956 (24%) | 6,852 (24%) | 6,104 (25%) | |
| 52,000_to_100,000 | 9,659 (18%) | 4,776 (17%) | 4,883 (20%) | |
| Greater_than_100,000 | 2,578 (4.9%) | 1,230 (4.3%) | 1,348 (5.5%) | |
| race, n (%) | <0.001 | |||
| White | 49,010 (92%) | 26,371 (92%) | 22,639 (93%) | |
| Asian_or_Asian_British | 1,921 (3.6%) | 1,162 (4.1%) | 759 (3.1%) | |
| Black_or_Black_British | 319 (0.6%) | 163 (0.6%) | 156 (0.6%) | |
| mixed | 966 (1.8%) | 437 (1.5%) | 529 (2.2%) | |
| Chinese | 152 (0.3%) | 91 (0.3%) | 61 (0.2%) | |
| Other ethnic group | 648 (1.2%) | 357 (1.2%) | 291 (1.2%) | |
| acne, n (%) | 744 (1.4%) | 495 (1.7%) | 249 (1.0%) | <0.001 |
1Wilcoxon rank sum test; Pearson’s Chi-squared test.