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Cumulative incidence by eGFRcys, eGFRcreat, and eGFRcreat‐cys at baseline, adjusted for age and sex. AF indicates atrial fibrillation; eGFR, estimated glomerular filtration rate; eGFRcreat, eGFR based on serum creatinine; eGFRcreat‐cys, eGFR based on serum creatinine and serum cystatin C; and eGFRcys, eGFR based on serum cystatin C.
