Baseline characteristics of the study population by case-control status, in the Minnesota Heart Survey.*

*Value are the means±SD, unless otherwise indicated.†Based on 2-sample t-test, Mann-Whitney U test, or Chi-square test.§Defined as a blood pressure of ≥140/90 mm Hg or the use of antihypertensive medication.∥Defined as a serum total cholesterol >200 mg/dl.¶Means for the activity of GPx3 (standard error) were adjusted for baseline year in a covariance analysis.