Table 1.

Intra- and Inter-ratter reliability of Sonographic measurements of spleen size

Observer	Intra-and Inter-Ratter Reliability (Intra class correlation coefficient at 95% confidence interval)
	Variables	F	lower bound	upper bound	Intra-class correlation values
Intra-observer,
Sonographer 1	Length	25	0.88	0.97	ICC (3, 2, 1) = 0.94
	Width	25	0.54	0.89	ICC (3, 2, 1) = 0.76
Intra-observer,
Sonographer 2	Length	25	0.86	0.95	ICC (3, 2, 1) = 0.92
	Width	25	0.52	0.87	ICC (3, 2, 1) = 0.74
Intra-observer,
Sonographer 3	Length	25	0.89	0.98	ICC (3, 2, 1) = 0.95
	Width	25	0.55	0.90	ICC (3, 2, 1) = 0.77
Inter-observer,
All Sonographers	Length	25	0.70	0.91	ICC (3, 2, 1) = 0.83
	Width	25	0.28	0.73	ICC (3, 2, 1) = 0.52

F = Frequency: ICC = Intra class correlation coefficient:

ICC (3, 2, 1) = Intra class correlation coefficient between the first, second, and third measurements obtained by each sonographer, otherwise called intra observer error or variation; and between the first measurements obtained by all the sonographers (inter observer error or variation).