However, a previous study showed that, in a cohort of 278 participants with chronic kidney disease, 24,25(OH)2D (R = −0.44, P < 0.001) showed stronger association with PTH than that with 1α,25(OH)2D (R = −0.16, P = 0.01) or 25(OH)D (R = −0.22, P < 0.001) [10]. Here, PTH is linked to chronic kidney disease.