Other self-reported demographic variables included age, sex, and education (less than high school, high school graduate or equivalent, or more than high school). Body weight was measured using a digital weight scale with participants wearing only underwear beneath the examination gown. Standing height was measured using a stadiometer with a fixed vertical backboard and adjustable headpiece. BMI was classified into 5 categories (<23.0, 23.0-24.9, 25.0-29.9, 30.0-34.9, and ≥35.0 [calculated as weight in kilograms divided by height in meters squared]).
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