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Interobserver variation in the sonographic estimation of renal volume in children
M A Sargent1, G Long, M Karmali
1Department of Radiology, British Columbia's Children's Hospital, 4480 Oak Street, Vancouver BC V6H 3V4, Canada.
Objective:
To quantify the interobserver variability in the sonographic estimation of renal volume in children.
Materials And Methods:
Three observer pairs measured the lengths and diameters of 176 kidneys in 90 children. Renal volumes were estimated from the formula for a prolate ellipsoid. The mean and standard deviation of the absolute and percentage differences between observers were calculated. The 95 % limits of agreement for each pair of observers were derived. Log-transformed data were used to derive overall limits of agreement.
Results:
Absolute interobserver variation increased with renal volume. Percentage variation was independent of renal size. There is a 95 % probability that a measurement of renal volume by one observer will be between 0.69 and 1.44 times a measurement made by a different observer.
Conclusion:
The interobserver variation in the sonographic estimation of renal volume represents approximately 2-3 years' normal growth in children aged over 2 years.
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