Objective: We assessed differential misclassification in self-reported family history of varicose veins by comparing consistency of subject's own varicose vein status and the consistency of information on varicose veins in family members.
Study Design And Setting: A population-based cohort study of 4,903 middle-aged residents of the city of Tampere, Finland. A questionnaire was used at entry and at the end of the 5-year follow-up.
Results: The estimated prevalence of positive family history of varicose veins varied depending on subject's own varicose veins from odds ratio (OR) 0.14 (95% confidence interval [CI]=0.01-0.58), in those with varicose veins reported in the first but not the second survey to OR 6.0 (95% CI=2.0-47.8), in those with varicose veins reported in the second survey but not in the first. The incidence of varicose veins varied from 0.4 (95% CI=0.1-1.4) to 4.1 (95% CI=2.1-7.1) (per 100 person-years) depending how the proband memorized the family history.
Conclusion: Results on the effect of family history on varicose veins are subject to bias, which reduces the credibility of the reports proposing a strong hereditary component of varicose veins.
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