M A Sargent1, G Long, M Karmali, S M Cheng. 1. Department of Radiology, British Columbia's Children's Hospital, 4480 Oak Street, Vancouver BC V6H 3V4, Canada.
Abstract
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.
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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