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

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

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
  1. 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
  2. ASA American Society of Anesthesiologists, BMI body mass index, CCr creatinine clearance, CI confidence interval, HR hazard ratio