Download serum trial3/15/2023 The contributions of the inter- and intraindividual variances to the overall variation in carotenoid concentrations were in the range of 61–70 and 20–35%, respectively, whereas center and center-by-season effects provided 2.6–9.5 and 0.2–1.4%, respectively. Using variance of component methods, the variation in serum carotenoid concentrations about the underlying mean was partitioned into explanatory components attributed to various sources. Subjects/Methods:įasting blood was collected annually for 4 years in all 1905 participants, and a subcohort of 901 participants were selected within each (of eight) center(s), by gender and dietary arm of the study, for measurement of five major carotenoid peaks. The intra- and interindividual variations and season and center effects were estimated from a series of serum carotenoid concentrations in the Polyp Prevention Trial (PPT) participants.
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