Frank W. sent in a timely reminder of the start-at-zero rule. This ad from Quaker Oats pitches the impossible: the smart consumer will never believe that cholesterol levels can be dropped just like that! According to Frank's measurement, the column heights plunged 77% from Week 1 to Week 4 in this chart.
In fact, if the vertical axis had started from 0, then the drop would more appropriately appear to be 5%. Now, even that would have been a miracle, in my opinion.
Thus, I would like to know what is a "point" of cholesterol, and what do they mean by "representative" drop. I suppose they are asking me to call that number.
My previous posts (with commentary from readers) about starting at zero can be found here and here.