Fig. 3
From: Contextual effects: how to, and how not to, quantify them
Inappropriate method for measuring contextual effects using the proportional contextual effect method. In this case, a specific treatment effect (on a multiplicative scale) is calculated and not a “proportional contextual effect” because the comparison of treatment versus placebo group controls for non-specific and contextual effects. It should be noted that inappropriate formulas for the calculation of the treatment effect and its variance were used