KL and chronic kidney disease: A previous study in 2101 participants from the KoreaN Cohort Study for Outcome in Patients With Chronic Kidney Disease (KNOW-CKD) cohort reported no significant association between the serum klotho concentration and baPWV after adjustments (β = 0.003; 95% CI: − 0.04–0.05; P = 0.876)16.