Table 4.

Predictive analysis.

	Accuracy (%)	Creatinine	CKD-EPI	BIS-1 over-70	BIS-1 over-80	MDRD
Overall population	Mortality	78.74	75.86	76.44	78.74	76.44
	Composite	59.77	66.09	64.37	60.92	66.09
	AKI	89.08	87.36	87.93	86.78	86.21
Age < 70 years	Mortality	88.37	90.70	-	-	91.86
	Composite	70.93	76.74	-	-	70.93
	AKI	89.53	94.19	-	-	91.86
Age ≥ 70 years	Mortality	69.32	67.05	67.05	61.36	71.59
	Composite	69.32	67.05	72.73	63.64	75.00
	AKI	81.82	82.95	72.73	77.27	84.09

We calculated the accuracy (%) of prediction for mortality, composite endpoint and AKI using only a single indicator of kidney functionality (serum creatinine or a specific eGFR) together with the other variables, in the overall population, in the population with age < 70 years, and in the population with age ≥ 70 years. The other predictors or variables are age, blood urea nitrogen, comorbidities, leucocytes, neutrophils, and lymphocytes count, LDH, PCR, ferritin, procalcitonin, drugs.