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Table 2 Coefficients of the piecewise regression model between 25(OH)D levels derived from CLIA and LC-MS/MS

From: Implications of standardization of serum 25-hydroxyvitamin D data for the evaluation of vitamin D status in Germany, including a temporal analysis

 

If Rvala ≤ value

If Rval ≥ value

 

Study

Value

Intercept 1

X1b

Value

Intercept 2

X2b

R2

 GNHIES98

73.2698

−0.2256

1.2197

73.2698

49.0336

0.5474

0.94

 DEGS1

121.9968

14.5310

0.7715

121.9968

102.1919

0.0530

0.79

 KiGGS

60.5211

9.4005

1.0225

60.5211

52.4099

0.3119

0.81

  1. 25(OH)D Serum 25-hydroxyvitamin D, CLIA Chemiluminescent immunoassay, LC-MS/MS Liquid chromatography-tandem mass spectrometry, GNHIES98 German National Health Interview and Examination Survey 1998, DEGS1 German Health Interview and Examination Survey for Adults, KiGGS German Health Interview and Examination Survey for Children and Adolescents
  2. a In piecewise regression, the independent variable is partitioned into intervals and a separate line segment is fit to each interval (Rval = change point in serum 25(OH)D concentration) [23]
  3. b X1, X2 = slopes of the regression lines
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BMC Public Health

ISSN: 1471-2458

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