Vitamin E and vitamin A concentrations in plasma adjusted for cholesterol and triglycerides by multiple regression.

The plasma concentration of vitamins A and E varies with the amount of concurrent lipids and thus requires lipid standardization. The present study compares a new multiple regression-based method for adjusting vitamins A and E concentrations for cholesterol and triglycerides with previous methods (adjustment for cholesterol only, and adjustment for the sum of cholesterol and triglycerides). The results show that the new method can reduce influence of the concurrent lipids.