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Multivariable logistic regression model using backward elimination method
| Risk factor | OR (95% CI) | P value |
|---|---|---|
| Trial design | ||
| Nonrandomized phase II trial | 1 | |
| Nonrandomized phase III trial | 3.28 (0.99–10.90) | 0.051 |
| Randomized phase II trial | 3.91 (0.75–20.30) | 0.105 |
| Randomized phase III trial | 9.29 (3.39–25.40) | < 0.0001 |
| Planned accrual periods (years) | ||
| ≤ 3 | 1 | |
| 3 < | 0.37 (0.15–0.92) | 0.033 |
