It's fascinating data, and I'm glad it's being taken, but...I am a bit skeptical that we can draw any reasonable conclusions from it without limiting the data to long-term users.
It seems implausible that there has not been a significant change in the health-consciousness of the typical purchaser in the last month or two, vs. prior to that. I can't tell you what the change would be, but I find it highly implausible that it would be not at all different, given the biggest spike in public awareness of a health issue in several decades.
It's nice to see that Dalziel has thought of the issue, but the article doesn't tell us much about _how_ he accounted for that. I could think of ways, but I could also think of ways to screw it up, and it doesn't say in this article how he "ensured" that the effect is real.
It seems implausible that there has not been a significant change in the health-consciousness of the typical purchaser in the last month or two, vs. prior to that. I can't tell you what the change would be, but I find it highly implausible that it would be not at all different, given the biggest spike in public awareness of a health issue in several decades.
It's nice to see that Dalziel has thought of the issue, but the article doesn't tell us much about _how_ he accounted for that. I could think of ways, but I could also think of ways to screw it up, and it doesn't say in this article how he "ensured" that the effect is real.