Exactly Maya! How do they compare 9.9 to 10.6 and say there was no significant difference. I wouldn't expect there to be. They are practically the same! But 11 (O's level) compared to 20 we are shooting for is significant. FWIW - there are a few studies looking at redo drug levels and they are split on whether a higher level helps and if drug monitoring is beneficial. This is why our GI said that there was little in the way of medical literature to support our request.