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Correlations of weight and total psoas muscle area (tPMA) at lumbar levels L3–4 and L4–5 stratified by sex. Weight and tPMA highly correlate for male and female participants at L3–4 and L4–5, respectively. (Pearson's correlation coefficient r = 0.90 for boys at L3–4 and L4–5 and r = 0.87 for girls at L3–4 and L4–5). Upper and lower dashed lines represent upper and lower boundaries of the 95% reference range.
