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  • Title: Interobserver variation in the sonographic estimation of renal volume in children.
    Author: Sargent MA, Long G, Karmali M, Cheng SM.
    Journal: Pediatr Radiol; 1997 Aug; 27(8):663-6. PubMed ID: 9252431.
    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.
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