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Clinical and demographic characteristics and risk factors of the patients n (%)
| ESCC | Normal | |
| Age (yr) | ||
| mean ± SD | 68.1 ± 8.7 | 64.2 ± 11.2 |
| Sex | ||
| Male | 14 (73) | 15 (50) |
| Female | 5 (26) | 15 (50) |
| Smoking | ||
| Current | 15 (78) | 13 (43) |
| Never smoked | 5 (26) | 17 (56) |
| Alcohol use | ||
| Current | 4 (20) | 7 (23) |
| Never used alcohol | 15 (78) | 23 (77) |
| Sexual partners | ||
| Multiple | 6 (31) | 9 (30) |
| Single | 13 (68) | 21 (70) |
ESCC: Esophageal squamous cell carcinoma.
