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Odds of cognitive impairment by serum 25-hydroxyvitamin D [25(OH)D] levels. Bars indicate 95% confidence intervals. Cognitive impairment was defined as the worst 10% of the distribution of scores. Population weights are used to adjust for the sampling design. Results are also adjusted for age, sex, race/ethnicity, education, season tested, current smoking status, body mass index, alcohol consumption, serum vitamin E, combined family income, impaired mobility, and physical activity.
