Table 1

Parameters in different age groups

	Group 1 (20–30 years) n=24	Group 2 (31–40 years) n=30	Group 3 (41–50 years) n=24	Group 4 (51–60 years) n=32	Group 5 (>60 years) n=26	p Value
SV-E (ml)	75.68±15.97	74.23±23.57	69.27±16.74	65.34±22.67	63.27±80.83
NA SV-A (ml)	22.80±5.50^**	23.06±9.04^**	28.72±9.57	33.38±15.34	36.52±14.35^**	<0.001
End of A-QRS (s)	-28.36±11.21^*	-29.85±16.05^*	-36.76±16.15	-40.21±13.32	-41.68±14.36^*	<0.05
A dur (ms)	117.73±13.07^*	119.26±11.74^*	125.00±8.57	126.40±9.07	128.33±9.07^*	<0.05
Ar dur (ms)	102.70±15.65^*	103.20±15.20^*	110.00±10.95	112.00±16.33	114.76±12.09^*	<0.05
A dur – Ar dur (ms)	15.03±2.58^*	16.06±3.46^*	15.00±2.38^*	14.40±7.26	13.57±2.01^*	<0.05

↵* p<0.05,
↵** p<0.001.
A dur, mitral flow A duration; Ar dur, pulmonary vein A duration; End of A-QRS, time interval between end of mitral A wave to onset of QRS of ECG; SV-A, stroke volume of A; SV-E, stroke volume of E.