![]() ![]() The mean difference between the bone and chronological ages was 0.51☑.13 years in girls and 0.32☑.11 years in boys. The inter-observer Lin’s concordance correlation coefficient was ρ c=0.98, with a value of 0.05☐.52 for girls and 0.06☐.44 for boys (difference between observations in years), whereas the intra-observer Lin’s concordance correlation coefficient was ρ c=0.99 (0.05☐.27 for girls and 0.10☐.36 for boys). The repeatability of the measurement (intra-and inter-observer) and the systematic error inherent to Bone Age (BA) estimation using the Greulich & Pyle (GPA) method has been estimated using a sample from the Spanish population. As an indicator of growth rate, bone age is used to determine the level of development and to predict chronological age when this is not known. ![]()
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