Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12882-019-1260-y/MediaObjects/12882_2019_1260_Fig2_HTML.png)
Staging algorithm employed in PHS CKD Registry
Abbreviations: ESRD- End Stage Renal Disease; eGFR- estimated glomerular filtration rate. Definitions: eGFR1 = The most recent eGFR value within the last 3 years, eGFR2 = The second most recent eGFR value within the last 3 years, eGFR2’ = The most recent eGFR value within the last 3 years that occurred at least 90 days prior to eGFR1