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Clinical Chemistry, Vol 36, 207-210, Copyright © 1990 by American Association for Clinical Chemistry
SA Brown, E Boerwinkle, FK Kashanian, N Swanson and W Patsch
Department of Medicine, Baylor College of Medicine, Houston, TX.
The components of total variation--biological, inter- and intra- individual, and analytical--of plasma lipids, lipoprotein lipids, and apolipoproteins A-I and B have been determined in a population of 44 healthy women, ages 18-35 years. Blood was sampled three separate times at three-month intervals, with no restrictions on diet or physical activity during these periods. The greatest inter-individual variances were observed for high-density lipoprotein (HDL)-cholesterol, HDL2- cholesterol, and total plasma cholesterol. Triglycerides had the highest intra-individual variance (CV 22%). The percentage of inter- and intra-individual variances of apolipoprotein A-I concentrations were more reflective of total HDL- and HDL2-cholesterol content than of HDL3-cholesterol. Concentrations of calculated low-density-lipoprotein cholesterol showed a greater inter-individual variation (18.6%) than did apolipoprotein B (10.7%). The laboratory CVs for these analytes were similar to other reported values. From these data, we computed the expected variation for subjects in our study for single and repeated measurements. Such considerations can influence decision-making in the clinical setting or in designing epidemiological studies.
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