Factors affecting postoperative mortality of patients with insufficient union following osteoporotic vertebral fractures and impact of preoperative serum albumin on mortality

Table 4 Pre-surgery hazard ratios (95% CI) of mortality based on patient characteristics (N = 105)

Explanatory variable	Crude	p-value	Adjusted HR^†	p-value
Male vs female gender	2.74 (1.17, 6.41)	0.021	1.82 (0.76, 4.40)	0.18
BMI ≥25 vs 18.5–24.9 kg/m² BMI ≥25 vs. 18.5–24.9 kg/m²	1.45 (0.41, 5.09)	0.56	1.67 (0.44, 6.32)	0.45
BMI < 18.5 vs 18.5–24.9 kg/m² BMI < 18.5 vs. 18.5–24.9 kg/m²	2.78 (0.99, 7.81)	0.052	2.81 (0.96, 8.25)	0.061
Serum albumin < 3.5 g/dL	4.99 (2.00, 12.43)	0.0006	3.37 (1.28, 8.89)	0.014
CCr < 60 mg/dL	3.40 (1.15, 10.06)	0.027	1.96 (0.63, 6.05)	0.25
ASA physical status classification ≥3	3.93 (1.68, 9.21)	0.0017	2.36 (0.93, 6.01)	0.072

^†Explanatory variables were selected using p < 0.2 in the univariate analysis for crude hazard ratios. All of the variance inflation factors in the multivariate model for the calculation of adjusted hazard ratios were < 1.22, indicating there was no multicollinearity
ASA American Society of Anesthesiologists, BMI body mass index, CCr creatinine clearance, CI confidence interval, HR hazard ratio

ISSN: 1471-2474