A comparative analysis of predictive models of morbidity in intensive care unit after cardiac surgery – Part II: an illustrative example

Table 1 Preoperative continuous variables

Acronym	Description (units)	Training set		Testing set		Cut-off
		Mean	SD	Mean	SD
Age	Age (years)	67.5	8.9	67.5	8.9	71↑
H	Height (cm)	167	8.0	167	7.5	n.s.
W	Weight(kg)	72.4	11	72.8	12	72↓
BSA	Body surface area (m²)	1.79	0.17	1.80	0.17	1.8↓
Pre-HCT	Hematocrit (%)	29.7	4.6	29.9	4.2	n.s.
Cr	Creatinine (mg/l)	1.09	0.51	1.07	0.38	1.2↑
Alb	Albumin (g/l)	3.86	0.44	3.85	0.41	n.s.
Bil	Bilirubin (mg/dl)	0.81	0.40	0.83	0.30	n.s.
Pre-CI	Cardiac index (l/min/m²)	2.71	0.69	2.70	0.69	n.s.
Pre-PaCO₂	Partial pressure of arterial CO₂ (mmHg)	34.0	4.5	34.2	4.6	n.s.

↑ or ↓: increased morbidity risk for values greater or less than cut-off, respectively (n.s.: not statistically significant); SD, standard deviation.

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