20 Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 39Copyright (c) 2005 John Wiley & Sons, Inc.Chapter 1 Introduction to Statistical Quality Control, 5th Edition by Douglas C. Montgomery. 40Copyright (c) 2005 John Wiley & Sons, Inc.
Water hardness is a measure of the dissolved mineral content of water. There are two types: the general hardness (GH) and carbonate hardness (KH). When keeping freshwater fish and plants, the GH and the KH of aquarium water should match their natural habitat.
-The MDRD equation is superior to other methods of estimating GFR. The MDRD equation correlates better with measured GFR than other equations, including the Cockcroft-Gault equation. The MDRD equation is also superior to a 24-hour creatinine clearance measurement. Measured iothalamate clearance remains the gold standard for measuring GFR.