Table 1 Characteristics of case–cohort subjects, Nutrition Intervention Trials, Linxian, China*.
| Subcohort† | Stroke cases | |
|---|---|---|
| Number | 454 | 118 |
| Median (IQR) age (years) | 54 (50–60) | 60 (54–64) |
| Male (%) | 55.5 | 52.5 |
| Smoking (%) | 39.3 | 31.4 |
| Male smoking (%) | 70.7 | 66.1 |
| Female smoking (%) | 0.50 | 0.0 |
| Alcohol use (%) | 26.4 | 17.0‡ |
| Male drinking (%) | 40.6 | 32.1 |
| Female drinking (%) | 9.0 | 3.2 |
| Median (IQR) systolic blood pressure (mm Hg) | 142 (127–160) | 169 (154–188)‡ |
| Median (IQR) diastolic blood pressure (mm Hg) | 86 (78–95) | 97 (86–108)‡ |
| Median (IQR) BMI, (kg/m2) | 21.4 (20.0–22.8) | 20.9 (19.7–22.9) |
| General Population Trial (%) | 63.7 | 50.0‡ |
| Dysplasia Trial (%) | 36.3 | 50.0 |
BMI, body mass index; IQR, interquartile range.
*The Nutrition Intervention Trials consisted of two studies, the General Population Trial and the Dysplasia Trial.
†The subcohort of 454 subjects was drawn as an age‐ and a sex‐stratified random sample from 4005 subjects in the General Population Trial and Dysplasia Trial.
‡Significant (p<0.05) differences between subcohort and stroke cases.