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Results: 3

1.
FIGURE 2.

FIGURE 2. From: Evaluation of Vitamin D Standardization Program protocols for standardizing serum 25-hydroxyvitamin D data: a case study of the program's potential for national nutrition and health surveys12345.

Weighted relative frequency for serum 25-hydroxyvitamin D of National Adult Nutrition Survey samples (n = 1118) measured by using the Immuno Diagnostic Systems Ltd enzyme-linked immunosorbent assay (dotted green line) and standardized liquid chromatography–tandem mass spectrometry at University College Cork (dashed red line) and predicted as per Vitamin D Standardization Program protocol 2 [the black line with shaded area represents 95% confidence bands as estimated by using the method of Fiorio (25)].

Kevin D Cashman, et al. Am J Clin Nutr. 2013 June;97(6):1235-1242.
2.
FIGURE 1.

FIGURE 1. From: Evaluation of Vitamin D Standardization Program protocols for standardizing serum 25-hydroxyvitamin D data: a case study of the program's potential for national nutrition and health surveys12345.

Relation between serum 25(OH)D (nmol/L) in a subsample (n = 99) of National Adult Nutrition Survey samples measured by using an IDS ELISA and standardized LC-MS at University College Cork as per Vitamin D Standardization Program protocol 2. The figure shows the piecewise linear fit regression line; the shaded area represents 95% confidence bands. IDS, Immuno Diagnostic Systems Ltd; LC-MS, liquid chromatography–tandem mass spectrometry; 25(OH)D, 25-hydroxyvitamin D.

Kevin D Cashman, et al. Am J Clin Nutr. 2013 June;97(6):1235-1242.
3.
FIGURE 3.

FIGURE 3. From: Evaluation of Vitamin D Standardization Program protocols for standardizing serum 25-hydroxyvitamin D data: a case study of the program's potential for national nutrition and health surveys12345.

Bland-Altman comparison plot (y axis: standardized LC–tandem MS–measured minus LC–tandem MS–predicted differences; x axis: mean of LC–tandem MS–predicted and LC–tandem MS–measured values) of serum 25(OH)D of National Adult Nutrition Survey samples (n = 1118) measured by using standardized LC–tandem MS at University College Cork and predicted as per Vitamin D Standardization Program protocol 2. The diamonds indicate individual data points. Four black data points represent those that were deemed outliers by using an outlier limit of 4 SDs. LC–tandem MS; liquid chromatography–tandem mass spectrometry; 25(OH)D, 25-hydroxyvitamin D.

Kevin D Cashman, et al. Am J Clin Nutr. 2013 June;97(6):1235-1242.

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