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Table 2: 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.
	Coefficient	95% CI	P
Preprocedural Pao₂	0.42	0.23–0.62	.000
Number of vertebral bodies	3.54	1.09–6.00	.005