Different Placebos, Different Mechanisms, Different Outcomes: Lessons for Clinical Trials

doi:10.1371/journal.pone.0140967

PMC full text:

PLoS One. 2015; 10(11): e0140967.

Published online 2015 Nov 4. doi: 10.1371/journal.pone.0140967

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Fig 6

Means (+SD) for all the measurements in the mixed group.

After oxygen administration for three consecutive sessions, real oxygen was replaced with placebo aspirin. Note that none of the parameters was affected by placebo aspirin. *P<0.01.