Figure 1 The burden of chronic kidney disease (CKD) Figure 1 | The burden of chronic kidney disease (CKD)*. a | Percentage distribution of the various stages of CKD. b | CKD in the global population. The fraction of patients who undergo renal replacement therapy (RRT) is very small. *Global approximations, extracted from various databases5,12–18. Vanholder, R. et al. (2017) Reducing the costs of chronic kidney disease while delivering quality health care: a call to action Nat. Rev. Nephrol. doi:10.1038/nrneph.2017.63