In 2002, the National Kidney Foundation published treatment guidelines that identified five stages of Chronic Kidney Disease (CKD) based on declining GFR measurements. The guidelines recommend different actions based on the stage of kidney disease.
CSV (Comma Separated Value) was a file format devised to store tabular data. It uses commas to separate each entry in a row and the newline symbol to go to the next row. Excel is a more recent spreadsheet application from Microsoft and it saves the data with its own file format.
Just as the RTF format is a baseline for formatted text file. The CSV file type is one common baseline for communicating data, without formatting. To export this data to a comma separated value file, I'll open the File menu, point to Export and then click Export Report. In the Export dialogue box I can select my format so I'll click the Format control and in the list I will click Separated Values CSV. And again, that stands for comma separated values. I want to create a disk file so now I can click OK. Doing so displays the Separated Values Export Options dialog box, and I'll click to the right of that character so it's not highlighted.