Table 5.
Distribution of the predicted relative risk (PRR) and confidence intervals (CIs) for the factors influencing cannulation in the multiple-variable analysis (logistic regression using the backward LR method).
| PRR | 95% confidence interval | |||
|---|---|---|---|---|
| Minimum | Maximum | |||
| Factors | ||||
|
| ||||
| P = 0.002 | Age | 1.01 | 1.004 | 1.016 |
| P = 0.386 | Gender | 1.086 | 0.901 | 1.309 |
| P < 0.000 | History of previous upper abdominal surgery | 0.467 | 0.357 | 0.663 |
|
| ||||
| Additional findings | ||||
|
| ||||
| P = 0.000 | Periampullary tumor infiltrating the ampulla | 78.060 | 35.426 | 172.001 |
| P = 0.000 | Problem in GIT passage | 29.190 | 15.413 | 55.282 |
| P = 0.001 | Peptic ulcer | 3.457 | 1.687 | 7.085 |
|
| ||||
| Endoscopist | ||||
|
| ||||
| Endoscopist 1 | ||||
| P = 0.000 | Endoscopist 2 | 0.550 | 0.419 | 0.722 |
| P = 0.004 | Endoscopist 3 | 0.684 | 0.529 | 0.883 |
| P = 0.389 | Endoscopist 4 | 0.897 | 0.700 | 1.149 |