Table 4.

Sample sizes

		Left atrium				Right atrium
		5 %	10 %	15 %	20 %	5 %	10 %	15 %	20 %
Atrial function	Volumetric index (%)
Reservoir; global	EF Total	18	5	2	2	47	12	6	3
Conduit	EF Passive	135	34	15	9	162	41	18	11
Booster pump	EF Booster	391	98	44	25	317	80	36	20
	Strain (%)
Reservoir	εs	27	7	4	2	231	58	26	15
Conduit	εe	57	15	7	4	359	90	40	23
Booster pump	εa	281	71	32	18	496	124	56	32
	Strain Rate (s −1 )
Reservoir	SRs	57	15	7	4	484	121	54	31
Conduit	SRe	289	73	33	19	1085	272	121	68
Booster pump	SRa	435	109	49	28	869	218	97	55
	Atrial volume (ml)
	Maximum	39	10	5	3	129	33	15	9
	Minimum	85	22	10	6	159	40	18	10
	Prior to atrial contraction	89	23	10	6	147	37	17	10

Presented are sample sizes required to detect a relative 5, 10, 15 or 20 % change in atrial functional parameters (with a 90 % power and an α error of 0.05).

SD, standard deviation; CoV, coefficient of variation; ICC, intraclass correlation coefficient; CI, confidence interval.