Logistic Regression Analysis of Factors associated with Mechanical Complications in relation to the Surgical Approach (ALIF vs PLIF).
| Step 1a | B | P | Exp(B) | 95% CI for EXP(B) | |
| Lower | Upper | ||||
| Blood loss (mL) | 0.001 | 0.594 | 1.001 | 0.998 | 1.004 |
| Blood transfusion (RBC units) | –0.085 | 0.936 | 0.919 | 0.116 | 7.298 |
| Total operative time (min) | –0.048 | 0.026 | 0.914 | 0.854 | 0.994 |
| Hospital stay (d) | 1.074 | 0.008 | 2.926 | 1.328 | 6.444 |
| Pseudarthrosis rate | 1.252 | 0.026 | 1.970 | 1.131 | 2.620 |
| Postoperative ICU stay (d) | 1.438 | 0.249 | 0.421 | 0.366 | 48.494 |
| Constant | –2.826 | 0.665 | 0.059 | ||
Abbreviations: ALIF, anterior lumbar interbody fusion; ICU, intensive care unit; PLIF, posterior lumbar interbody fusion; RBC, red blood cell.
Note: "Step 1a" means that this is the first model of the stepwise logistic regression, and the variables listed here were evaluated in that model. Exp(B) represents the odds ratio. Variables significantly associated with mechanical complications in the model were hospital stay, total operative time, and pseudarthrosis rate.