Table 1. Age-, sex- and study area-adjusted baseline characteristics of 982 participants according to the case or control status.
| Baseline characteristics | Cases(n = 491) | Controls(n = 491) | P value |
|---|---|---|---|
| Age, year | 50.6 | 49.5 | - |
| Female, % | 43.6 | 43.6 | - |
| Urban area, % | 20.6 | 20.6 | - |
| Middle school and above, % | 43.4 | 45.6 | 0.730 |
| Married, % | 90.4 | 94.7 | 0.028 |
| Family history of heart attack, % | 6.9 | 4.7 | 0.127 |
| Fasting time, h | 4.0 | 4.0 | - |
| Lifestyle factors | |||
| Daily tobacco smoker, % | 46.6 | 40.3 | 0.004 |
| Daily alcohol drinker, % | 9.0 | 10.0 | 0.455 |
| Physical activity, MET-h/day | 22.0 | 23.9 | 0.097 |
| Diet score | 2.3 | 2.5 | 0.001 |
| Vegetables 7 days/week, % | 92.7 | 91.0 | 0.278 |
| Fruit 7 days/week, % | 9.4 | 13.8 | 0.030 |
| Read meat <7 days/week, % | 79.2 | 80.0 | 0.600 |
| Soybean product ≥4 days/week, % | 5.9 | 9.6 | 0.026 |
| Fish ≥1 days/week, % | 24.6 | 28.9 | 0.022 |
| Coarse grains ≥ 4 days/week, % | 22.8 | 24.6 | 0.047 |
| Body mass index, kg/m2 | 23.9 | 23.3 | 0.002 |
| Metabolic risk factors | |||
| Prevalent hypertension, % | 52.5 | 29.9 | < 0.001 |
| Prevalent diabetes, % | 10.0 | 4.5 | 0.004 |
| Blood lipids | |||
| Total cholesterol, mmol/L | 4.69 | 4.52 | 0.005 |
| LDL-C, mmol/L | 2.35 | 2.21 | 0.003 |
| HDL-C, mmol/L | 1.22 | 1.18 | 0.025 |
| Triglyceride, mmol/L | 2.20 | 2.01 | 0.064 |
The results are presented as means or percentages. P values were not showed for matched factors. MET = metabolic equivalent of task; LDL-C = low-density lipoprotein cholesterol; HDL-C = high-density lipoprotein cholesterol.