Re: if zappers are "100% effective", why care?

I agree that it's not placebic, but the accepted scientific protocol is to test against an indistinguishable placebo, which is not quite the same as a customer response survey. (The skeptic is of course thinking "they paid for it, and by golly they had to get well or it wouldn't be worth the money...")

Cool stats. They raise the question, why if it's a placebo would people respond differently? Ideally it could be compared double-blind to non-working zappers.