Table 1.

Descriptive statistics of the study cohort and results of the univariate analysis for each risk factor

	All		Control group		NaHCO 3 group
	Number	%	Number	%	Number	%	P -value
Biometric data
Female	90	26.32	43	25.6	47	27.01	0.86
Male	252	73.68	125	74.4	127	72.99	0.86
Comorbidities
IABP	1	0.29	0	0	1	0.57	0.98
Ejection fraction <35%	35	10.23	20	11.9	15	8.62	0.41
IDDM	49	14.33	23	13.69	26	14.94	0.86
COPD	56	16.37	25	14.88	31	17.82	0.56
Creatinine >1.2 mg/dl	79	23.1	40	23.81	39	22.41	0.86
Congestive heart failure	145	42.4	68	40.48	77	44.25	0.55
Surgery characteristics
CABG	182	53.22	83	49.40	99	56.90	0.27
Valve	53	15.5	31	18.45	22	12.64	0.27
CABG + valve	40	11.7	23	13.69	17	9.77	0.43
Other surgery	67	19.59	31	18.45	36	20.69	0.63
Repeat surgery	9	2.63	2	1.19	7	4.02	0.19
Emergency surgery	9	2.63	5	2.98	4	2.30	0.96

Numbers and percentages for biometric data, comorbidities, and surgery characteristics are presented. Statistical analysis was performed using the chi² test. IABP, intra-aortic balloon pump; IDDM, insulin-dependent diabetes mellitus; COPD, chronic obstructive pulmonary disease; CABG, coronary artery bypass graft.