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The correspondence of the esophageal cancer case and control cohorts by age, ethnicity, sex, and smoking habit.
| Cohort | Years of birth | Nationality, persons (%) |
Sex, persons (%) |
Smoking habit, persons (%) | Total, persons | ||
|---|---|---|---|---|---|---|---|
| Kazakh | Russian | Male | Female | ||||
| Case | 1920–1977 | 102 (88.69) | 13 (11.31) | 62 (53.91) | 53 (46.09) | 30 (26.08) | 115 |
| Control | 1921–1976 | 89 (89.00) | 11 (11.00) | 54 (54.00) | 46 (46.00) | 26 (26.00) | 100 |
