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.
If you find or receive a .csv file on your computer you might not know what it is. A .csv file, or comma separated values, is a very simple database format. The information inside could be a spreadsheet, a contact list or just about any data set that can be arranged in columns and rows. Essentially, there are a lot of different things that a .csv file could be.