Table 1. Baseline characteristics of participants in CKB.
| Variable1 | All participants (n = 510,314) |
|---|---|
| Age (SD), year | 51.5 (10.7) |
| Female, % | 59.0 |
| Socioeconomic and lifestyle factors | |
| Urban region, % | 44.1 |
| Middle school and higher, % | 43.4 |
| Annual household income ≥35,000 yuan, % | 24.7 |
| Current regular smoker, % | |
| Male | 67.6 |
| Female | 2.8 |
| Weekly drinker, % | |
| Male | 33.2 |
| Female | 2.1 |
| Total physical activity (SD), MET-h/day | 21.1 (13.9) |
| Blood pressure and anthropometry | |
| SBP (SD), mmHg | 131.1 (21.3) |
| RPG (SD), mmol/L | 6.1 (2.3) |
| BMI (SD), kg/m2 | 23.7 (3.4) |
| BMI25 (SD), kg/m2 | 21.9 (2.6) |
| WC (SD), cm | 80.3 (9.8) |
| %BF (SD), % | 27.9 (8.4) |
| Prior disease history, % | |
| Previously diagnosed diabetes | 3.1 |
| Screen-detected diabetes | 2.8 |
| Gallbladder disease | 6.0 |
| Family history of diabetes | 4.9 |
| Family history of cancer | 14.0 |
1Results were adjusted for age, sex, and region (where appropriate).
Numbers of participants with missing data: BMI n = 2; %BF n = 241; BMI25 n = 82,415; RPG n = 8,156.
Abbreviations: %BF, body fat percentage; BMI, body mass index; BMI25, BMI at age 25; CKB, China Kadoorie Biobank; MET-h/day, metabolic equivalent of task hours per day; RPG, random plasma glucose; SBP, systolic blood pressure; WC, waist circumference.