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Cross-sectional associations between 25(OH)D status and physical function: Lifestyle Interventions and Independence for Elders Pilot. (a) Short physical performance battery (SPPB). (b) Four hundred meter walk speed. Least squared means with 95% confidence intervals. Models adjusted for age, gender, race, field center, season, education, visit, randomization arm, visit by randomization arm interaction, body mass index, and physical activity.
