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Cotinine level, esophagitis and history of passive smoking in each group
| Group | Cases with low cotinine level [n(%)] | Cases with high cotinine level [n(%)] | Total of cases [n(%)] |
|---|---|---|---|
| Controls | 41 (91.1) | 4 (8.9) | 45 (100) |
| Esophagitis | 43 (93.5) | 3 (6.5) | 46 (100) |
| Total | 84 (92.3) | 7 (7.7) | 91 (100.0) |
