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. Author manuscript; available in PMC: 2010 May 1.

Published in final edited form as: Clin Chem. 2009 May;55(5):888–894. doi: 10.1373/clinchem.2008.117929

Scatterplot showing the correlation of Friedewald fasting and direct fasting LDL-C values, Pearson correlation coefficient 0.976, P<0.001 (left); and Bland-Altman plot showing the difference between direct fasting and Friedewald fasting values vs the mean of the two (right). The mean difference (direct minus Friedewald) was − 5.64 (95% CI − 5.75, − 5.53).

Scatterplot showing the correlation of Friedewald fasting and direct fasting LDL-C values, Pearson correlation coefficient 0.976, P<0.001 (left); and Bland-Altman plot showing the difference between direct fasting and Friedewald fasting values vs the mean of the two (right). The mean difference (direct minus Friedewald) was − 5.64 (95% CI − 5.75, − 5.53).