Table 2 Multivariate analysis of factors associated with prolonged time on ventilation in the entire population and among patients on maintenance hemodialysis

Parameter	Standardized β coefficient	Partial correlation	p
Model 1: Entire population
Σ fluid balance, ml	0.171	0.172	0.004
Group of patients: reference, CKD3–4 and dialysis	0.182	0.183	0.002
SOFA on the first day after surgery	0.312	0.314	0.0001
Model 2: Patients on hemodialysis
Σ fluid balance, ml	0.284	0.497	0.049
Time from surgery to 1st HD, h	0.289	0.332	0.038
SOFA without renal component	0.549	0.627	0.0001

Model 1: r = 0.369, r² = 0.136 and adjusted r² = 0.130; p = 0.0001. Other variables in the model: anesthesia time, noradrenaline and dobutamine dose 24 h after surgery
Model 2: r = 0.757, r² = 0.574 and adjusted r² = 0.524; p = 0.0001. Other variable in the model: age
HD hemodialysis, SOFA Sequential Organ Failure Assessment

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