Table 1.
Backgrounds of patients (number of cases)
| BIS value | 56-64 (May/2004-Sep/2005) | 70-75 (Oct/2005-April/2007) | Total |
| Esophageal cancer | 13 | 36 | 49 |
| Gastric cancer | 100 | 149 | 249 |
| Colon cancer | 26 | 42 | 68 |
| Total | 139 | 227 | 366 |
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