1. Box plots of urinary creatinine:osmolality ratios in two urine samples of healthy neonates (2 to 4 days apart) (A) and four additional groups of older children 7 days apart (B).
Box plots of urinary creatinine:osmolality ratios in two urine samples of healthy neonates (2 to 4 days apart) (A) and four additional groups of older children 7 days apart (B). Data are given as median and range. Difference between first and second urine samples in the neonates was significant (p<0.001). No significant differences between the values in the two urine samples were found in the older children (p=0.98).
Vera Matos et al. Arch Dis Child Fetal Neonatal Ed 1999;80:F240-F242
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