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Restricted cubic-spline Cox regression plot showing the hazard ratios and 95% confidence limits (dotted lines) of incident hip fractures by serum 25(OH)D. Regression was adjusted for age, gender, race, season of blood draw, BMI, alcohol use, fracture after age 45, falls, health ABC performance score, IL-6, serum calcium, hip aBMD, eGFR, and PTH.
