FGF23 and sarcopenia: Log‐transformed serum FGF23 correlated positively with handgrip strength (r = 0.27, p = 0.01, 95% confidence interval (CI) 0.06–0.46) and calf circumference (r = 0.27, p = 0.01, 95% CI 0.06–0.46), and in multiple regression analyses, it was found to be a significant independent predictor of both handgrip strength (beta = 5.39, 95% CI 2.07–8.72) and sarcopenia (odds ratio = 0.14, 95% CI 0.02–0.75).