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Since Dinkel's description of the renal volume formula, a lot of papers reported expected values of renal length and renal volume in healthy children. In most of them, the normal renal ultrasounds of hospitals are used, with several operators and with no randomized samples.
In 2013 an app with the results of renal length and volume of 882 children (0 to 18 years) studied, selected from a randomized, aleatory, and probabilistic sample form Gran Resistencia, Chaco, Argentina, was developed (https://porbm28.shinyapps.io/RenalVolume/).
The general objective is to validate ten years after, renal size and volume curves in pediatric population, developed in 2013, in children from 0 to 18 years of age from the Gran Resistencia, Chaco Province, Argentina.
This study is a descriptive, observational, cross-sectional study with a randomized sample. The study universe was those 882 children evaluated in the period 2012-2014. They were taken from a sample stratified, random and probabilistic according to 2010 census for Gran Resistencia, Chaco, Argentina. Those who in 2022 were not 18 years old were selected. The sample size to validate renal length for a 10% error, with a 95%CI was 87 children, for 97% CI 104 and 140 for 99% CI. Inclusion criteria: having participated in the original study (2022), 18 years old or younger. Exclusion criteria: those participants in the original research who in 2022 presented two or more episodes of documented urinary infection with urine culture, kidney trauma, kidney tumors, kidney lithiasis as a history, uronephrosis, and urinary system surgeries.
Children were studied by only one ultrasound operator.
In this preliminary analysis, 56 children with a mean age of 12 ± 2 years were evaluated in 2023. The characteristics of the studied participants are observed in Table 1.
Regarding renal length and volume, no significant differences were found between the values found in 2013 for the same age and sex groups comparing them with those found in 2023´.
This is the first study that validat renal length and volume in healthy children (0-18 years old), from a randomized, aleatory and probabilistic sample, made by only one ultrasound operator.