Tab. III.

Comparison of heart failure grade (NYHA class) before and after surgery

		NYHA class before surgery, mean ± SD	NYHA class after surgery, mean ± SD	p
Age groups	Group A (n = 170)	2.9 ± 0.6	2.4 ± 0.7	< 0.05
	Group B (n = 224)	2.8 ± 0.6	2.6 ± 0.7	< 0.05
DM groups	Group DM (+) (n = 75)	2.9 ± 0.6	2.4 ± 0.7	< 0.05
	Group DM (–) (n = 319)	2.8 ± 0.6	2.6 ± 0.7	> 0.05
LVEF groups	Group I (n = 135)	3.09 ± 0.6	2.7 ± 0.7	< 0.05
	Group II (n = 206)	2.8 ± 0.6	2.4 ± 0.6	< 0.05
	Group III (n = 53)	2.9 ± 0.4	2.3 ± 0.4	< 0.05

DM (+) – group with diabetes mellitus, DM (–) – group without diabetes mellitus, LVEF – left ventricular ejection fraction, NYHA – New York Heart Association, SD – standard deviation