We can all agree that the participants are allergy sufferers. Most if not all allergic to Ragweed. We could also agree that these participants should have symptoms like headaches, runny nose, itchy eyes etc. during ragweed season. I believe there were 1500 participants. Thats alot of data right.
Lets say that the data presented was inconclusive. There wasnt enough difference between the participants taking placebo and Prehistin. But both reported scores of 1 or 2s.