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Box-and-whisker plot of 25(OH)D assay comparisons. The central boxes represent the 25th to 75th percentile range. The lines inside the boxes show the median value for each method. The straight line shows the median value as measured by the liquid chromatography-tandem mass spectrometry (reference method). Recalibrated chemiluminescence immunoassay - IDS-iSYS 25(OH)DS assay, IQR - interquartile range. ng/mL x 2.5 = nmol/L.
