Comment on Open thread, Dec. 14 - Dec. 20, 2015

Sat, 19 Dec 2015 04:19:02 GMT

The placebo group is called such because it receives the placebo treatment, not because medical researchers think all improvement in it is attributable to the placebo effect. Results are reported as improvement in the treatment arm vs. the placebo arm, and never have I seen these differences explicitly reported as treatment effect vs. placebo effect, and I've read hundreds of medical papers. The real magnitude of the placebo effect is almost never of interest in these papers. Some professionals in the medical community could have such a misconception because of the usual lack of scientific training, but I'd like to think they are a small minority.

If the placebo effect is of real importance, I think a more significant problem would be the lack of use of active placebos that mimick side effects since most drugs have them and this is a potential source of breaking the blinding of RCTs.

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