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Table 2 The whole set of non dichotomous preoperative, intraoperative and postoperative variables considered a priori as likely predictors

From: A straightforward approach to designing a scoring system for predicting length-of-stay of cardiac surgery patients

Variable (units) 99% confidence interval of odds ratio Cut-off
Age (years) 1.36-2.46 69
Height (cm) 0.668-1.19 167
Weight (kg) 0.587-1.05 71
Body surface area (m2) 0.550-0.983 1.8
NYHA heart failure classification 1.55-2.78 2
Preoperative hematocrit (%) 0.499-0.895 39.2
Preoperative creatinine (mg/dl) 1.51-2.69 1.0
Preoperative bilirubin (mg/dl) 0.812-1.45 0.8
ECC time (min) 1.75-3.22 122
Aortic clamping time (min) 1.44-2.61 86
Minimum hematocrit at cardiopulmonary bypass (%) 0.517-0.924 24
Minimum intraoperative temperature (°C) 0.410-0.743 32.5
Postoperative hematocrit (%) 0.570-1.02 31
Postoperative venous O 2 saturation (%) 0.656-1.17 63.7
Postoperative creatinine (mg/dl) 3.35-6.29 1.2
Postoperative bilirubin (mg/dl) 1.99-3.70 1
  1. NYHA = New York Heart Association; ECC = extracorporeal circulation.
  2. The 99% confidence intervals of the odds ratio were calculated after dichotomizing each variable on the basis of the cut-off (median calculated on original sample). The variables in italics were excluded from the model because their corresponding odds ratios were not significantly different from 1 (p < 0.01).