Table 8.

Risk factors with greatest effect size (odds ratio) in each regression

Regression 1		Regression 2		Regression 3
Variable	OR	Variable	OR	Variable	OR
1. Thoracic fusion	3.4	1. Preoperative pneumonia	3.5	1. Thoracic fusion	3.7
2. ALF	3.2	2. Thoracic fusion	3.4	2. Operative time ≥ 75th percentile	3.4
3. Quadriplegia	2.2	2. Operative time ≥ 75th percentile	3.4	3. Preoperative transfusion	2.3
4. ASA 4+ versus ASA 1–2	2.1	4. ASA4+ versus ASA 1–2	2.1	3. Thoracic laminectomy	2.3
5. Age 80+ years versus age < 40 years	2.0	4. ALF	2.1	5. Disseminated cancer	2.1
5. Corpectomy	2.0	4. Thoracic laminectomy	2.1	5. ASA 4+ versus ASA 1–2	2.1
5. PLF	2.0	7. Quadriplegia	2.0	5. ALF	2.1
8. Operative time ≥ 75th percentile	1.9	7. Preoperative transfusion	2.0	5. PLF	2.1
9. Black/African American race	1.8	7. PLF	2.0	9. Age 80+ years versus age < 40 years	2.0
9. Cervical laminectomy	1.8	10. Age 80+ years versus age < 40 years	1.9	10. Weight loss	1.9
				10. Age 70–79 years versus age < 40 years	1.9

p < 0.05 for all values; bolding indicates that a risk factor was found to be in the top 10 for all three regressions;

OR = odds ratio; ALF = anterior lumbar fusion; PLF = posterior lumbar fusion.