[l113892]

In statistics, such as Six Sigma tools, we refer to the Ys and Xs. Ys are the outcomes- such as an ulcer. Xs are the inputs, such as water variables that can be measured and are believed to contribute to the outcome; in this case, an ulcer. The CFU count would be an X in that the CFU count can contribute to the resulting ulcer and it is measurable- very important in statistics. Some proposed variables are not measurable, therefore of not much value. So without knowing the formula to predict an ulcer, we cannot know the impact the various Xs have on the outcome- an ulcer. But at least the CFUs are measurable and a product such as Lymnozyme can be proven to reduce CFU counts. Other snake oils are not measurable and therefore, by definition, of not much value.