Determinants of Plasma Vitamins and Lipids: The Working Well Study
1994
This study was conducted to assess the determinants of plasma concentrations of α-tocopherol, β-carotene, retinol, and cholesterol fractions in a randomly selected subset of 203 workers participating in a worksite-based health intervention trial. Workers were from four companies in eastern and central Massachusetts, and all completed an 84-item semiquantitative food frequency questionnaire as part of baseline (preintervention) self-assessment instruments. At the time of fasting blood sampling, each participant also completed a short screening questionnaire for assessment of changes in dietary habits and tobacco exposure and for collection of data on use of vitamins and nutritional supplements
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