Table 2.

Distributions of non-categorical data

	Control group			NaHCO 3 group
	Median	IQR	Range	Median	IQR	Range	P -value
Age, years	70	62, 74	34 to 84	70	60, 74	42 to 88	0.64
Creatinine, mg/dl	0.96	0.81, 1.18	0.5 to 2.1	0.97	0.81, 1.13	0.54 to 4.57	0.26
Score points	2	1.0, 3.5	0 to 10	2	1.0, 4.0	0 to 10	0.86
ACC time, minutes	74.5	61.5, 97.5	17 to 214	69.5	52, 91	29 to210	0.03
CPB time, minutes	116	94, 147.5	42 to 310	112.5	89, 138	45 to 313	0.06
fhb at baseline, mg/dl	9	8.0, 11.0	4.0 to 93	9	8.0, 11.0	5.0 to 55	0.18
fhb after CPB, mg/dl	55	40,73	7.0 to 187	45	34, 62	11 to 130	0.001

Distributions of non-categorical data, which are expressed as median, IQR, and range. Tests of the distributions of age, cardiopulmonary bypass (CPB) time, concentration of serum creatinine, and concentration of free hemoglobin (fhb) at baseline and at the end of CPB were performed by logistic regression. The Mann-Whitney U-test was used to evaluate the distribution of score points. The fhb concentration after CPB was significantly lower in the NaHCO₃ group, and the aortic cross-clamping (ACC) time was significantly shorter.