Table 3.

Univariate and multivariate analysis of the variables associated with long-term survival

VariableUnivariate AnalysisMultivariate Analysis
HR (95% CI)P ValueHR (95% CI)P Value
Age1.04 (1.03 to 1.05)<0.0011.04 (1.02 to 1.05)<0.001
Medical0.68 (0.51 to 0.89)0.010.60 (0.43 to 0.83)0.002
Kidney function at admission
 Normal11
 Preexisting CKD2.21 (1.57 to 3.09)<0.0011.42 (0.96 to 2.10)0.08
 No data available1.14 (0.82 to 1.59)0.440.84 (0.58 to 1.21)0.34
Admission diagnosis
 Sepsis0.70 (0.46 to 1.06)0.090.80 (0.51 to 1.24)0.31
 Thoracic surgery1.11 (0.80 to 1.52)0.540.99 (0.66 to 1.50)0.97
 Other11
eGFR at discharge
 60 ml/min per 1.73 m211
 30–59 ml/min per 1.73 m21.35 (0.93 to 1.96)0.121.06 (0.71 to 1.57)0.78
 15–29 ml/min per 1.73 m22.87 (1.90 to 4.35)<0.0011.62 (1.01 to 2.58)0.04
 <15 ml/min per 1.73 m22.94 (1.99 to 4.36)<0.0011.93 (1.23 to 3.02)0.004
Malignancy1.85 (1.29 to 2.65)0.0011.73 (1.17 to 2.55)0.006
Cardiovascular disease1.66 (1.25 to 2.20)0.0011.22 (0.85 to 1.74)0.28
Diabetes mellitus1.69 (1.25 to 2.30)0.0011.15 (0.83 to 1.59)0.40
Hypertension1.72 (1.29 to 2.30)<0.0010.94 (0.69 to 1.29)0.71
Year of admission0.98 (0.95 to 1.01)0.210.96 (0.92 to 0.99)0.02
  • Variables tested in multivariate analysis: age, medical admission type, preexisting CKD, admission diagnosis sepsis, thoracic surgery or other, class of estimated GFR at discharge, malignancy, cardiovascular disease, diabetes mellitus, hypertension, and year of admission. HR, hazard ratio; CI, confidence interval; eGFR, estimated GFR (categorical class at discharge, compared with eGFR ≥60 ml/min per 1.73 m2).