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Changes in kidney sizes based on chronic kidney disease (CKD) stages. The renal length was significantly smaller in patients with CKD stage 5 than in those with CKD stage 1 or 2 (P < 0.01). However, in CKD stages 1 to 4, there was no clear association between the disease stage and kidney size. *P < 0.05 versus stage 1, † P < 0.05 versus stage 2.
