Results of multiple regression: model 2
| Coefficient | 95% CI | P | |
|---|---|---|---|
| Preprocedural Pao2 | 0.42 | 0.23–0.62 | .000 |
| Number of vertebral bodies | 3.54 | 1.09–6.00 | .005 |
Note:—CI indicates confidence interval. Independent variables were preprocedural Pao2 and number of vertebral bodies. Adjusted r2, 0.336.