TABLE 1.

Central Versus Local Measurements of Pediatric Echocardiograms

Measure	n	Central		Local		Difference, Central Minus Local
		Mean	SD	Mean	SD	Mean	SD	P*	95% PI†	ICC‡
Fractional shortening, %	724	35.4	5.6	36.4	5.5	−0.97	4.7	<0.001	−10.2, 8.3	0.64
End-diastolic dimension, cm	724	2.39	0.64	2.42	0.62	−0.031	0.15	<0.001	−0.32, 0.25	0.97
End-diastolic posterior wall thickness, cm	735	0.43	0.11	0.41	0.13	0.022	0.10	<0.001	−0.18, 0.22	0.65
End-diastolic septal thickness, cm	726	0.57	0.13	0.49	0.14	0.080	0.13	<0.001	−0.18, 0.34	0.50

^*Paired t test of whether the central and local means are equal.

^†95% Prediction interval (PI) indicating upper and lower bounds for the difference between a central and local measurement of the same child.

^‡ICC relates the variability between repeated measurements on the same child to the variability between measurements on different children.