[thorum]

Yes, but they’re still averaging the results in the “it worked” category. Hypothetically, if it worked very well for 5 users and only a little for 95 users, an average score over all 100 will make it appear to not work for anyone. I’m not going to argue this is definitely the case - just that this analysis doesn’t account for the possibility, and it wouldn’t be unexpected in the area of reading ability, where one would expect individual differences to be important.