FGF23 and Cognitive impairment: In the unadjusted model, when compared to the lowest quartile of FGF23 (FGF23 <53 RU/ml), the highest quartile of FGF23 (FGF23 >100 RU/ml) had a 73% higher odds of incident cognitive impairment (OR 1.73, 95% confidence interval [CI] 1.21,2.47).