CST3 and chronic kidney disease: The main finding was a negative correlation between SWB, assessed by the PGWB index and serum cystatin C as a biomarker of renal function, even after adjusting for age and BMI, in Active Seniors but not in subjects with subjective memory complaints (DGM cohort), two cohorts of Swedish elderly subjects with a low prevalence of chronic kidney disease (CKD) as judged from their serum cystatin C concentrations.