The serum lipoprotein (LP) composition and LP lipid interrelations were studied in 50-year-old men with different types of hyperlipoproteinaemia (HLP) and in randomly sampled health controls from the same population. The ratio cholesterol/triglycerides in very low density lipoproteins (VLDL)was high in HLP type III. The other types of HLP showed ratios not significantly different from the controls. The low density lipoprotein (LDL) cholesterol concentration was similar in controls, type III and type IV while, by definition, higher values were seen in type II A and II B. All types of HLP showed statistically significantly higher LDL triglycerides than the controls. HLP type II A and II B showed cholesterol/triglyceride ratios in LDL similar to the controls. The corresponding ratio in type IV was lower than in the control subjects but the lowest ratio was seen in type III with a mean value below the 5th percentile of healthy controls. The high density lipoprotein (HDL) cholesterol concentration was decreased in HLP type IV. Apparently elevated HDL triglyceride levels were seen in all types of HLP with the highest mean value in type III. The LP lipid interclass relationships were analysed in the random sample of health men and compared to corresponding relationships in the different types of HLP. Apart from HLP type III and HLP type IV with low LDL cholesterol levels all other types of LP interconversions. Intype IV a significant negative correlation between VLDL concentration and LDL cholesterol concentration and the cholesterol/triglyceride ratio in VLDL. There were no significant correlations between LDL cholesterol concentration and VLDL lipid variables in other types of HLP and normolipidaemia.
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