Elevated plasma fibrinogen concentrations (fibrinogen) are an important independent risk factor of atherosclerotic disease. Using the kinetic method, we measured fibrinogen in 808 individuals, of which 757 were members of 204 pedigrees. Correlation analysis and two-way analysis of variance (ANOVA) showed a significant association of fibrinogen with age, body mass index (BMI), sex, smoking habits, sport activity, and other lifestyle factors. However, multivariate regression analysis of fibrinogen established an independent significant contribution of only the first three factors. Fibrinogen levels adjusted respectively were subjected to complex segregation analysis. Our aim was to identify the contribution of major gene effects and residual (within the genotype) family correlations on fibrinogen variation. Results of this study suggest codominant alleles at a major locus accounting for 39% of variation. There was also evidence of a significant residual parent/offspring correlation.
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