Evidence from meta‐analyses of RCTs was assessed in terms of the significance of the summary effect, using a P ‐value of <.005 as the threshold for statistical significance, as recently proposed. 37, 38 We used stringent P ‐values when evaluating the findings of RCTs in order to decrease the possibility of “false‐positives” (i.e. to claim that an effect is present when there is ...
