Fig. 2From: Assessment of estimated low-density lipoprotein-cholesterol (LDL-c) equations: a systematic review and meta-analysisThe pooled correlation coefficient of Friedewald’s LDL-c equation compared to direct measurement in determining levels of LDL-c from all included studies. There was a positive correlation between Friedewald’s LDL-c equation and direct measurement in determining levels of LDL-c [0.94 (95% CI 0.92–0.96)]Back to article page