Table 4.
Calculation of risk score of primary diagnosis and surgical procedures
| Risk factors | X i | βi | |
|---|---|---|---|
| Yes | No | ||
| 1. Disseminated cancer | 1 | 0 | 0.171 |
| 2. Gastric cancer | 1 | 0 | 0.612 |
| 3. Cancer of small intestine | 1 | 0 | 0.474 |
| 4. Cholangiocarcinoma (extrahepatic bile ducts perihilar) | 1 | 0 | 0.504 |
| 5. Cholangiocarcinoma (extrahepatic bile ducts distal) | 1 | 0 | 0.250 |
| 6. Gallbladder cancer | 1 | 0 | 0.504 |
| 7. Operation for acute diffuse peritonitis | 1 | 0 | 0.554 |
| 8. Hepatectomy with >1 segment except for lateral segment | 1 | 0 | 0.530 |
| 9. Pancreaticoduodenectomy | 1 | 0 | 0.593 |
| 10. Esophagectomy | 1 | 0 | 2.619 |
| 11. Splenectomy | 1 | 0 | 0.310 |
| 12. Enterostomy/closure with bowel resection | 1 | 0 | 0.246 |
| 13. Enterostomy/closure without bowel resection | 1 | 0 | 0.206 |
Risk score of primary diagnosis and surgical procedures, Σ [βi × X i].
βi is the coefficient of the variable X i in the logistic regression equation. If a categorical risk factor is present, the X i value is 1 (0 if it is absent). A total risk score of primary diagnosis and surgical procedures for a given patient is calculated by summing βi × X i.