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Relation between 25(OH)D in plasma CHMS samples originally reported and values remeasured in serum via the current immunoassay for CHMS cycles 1 (A) and 2 (B). n = 106 for each cycle. The solid line represents the weighted Deming regression fit. The dashed lines represent the 95% CI. CHMS, Canadian Health Measures Survey; 25(OH)D, 25-hydroxyvitamin D.
