Figure 3.

Indicating the standardized mean difference in credibility according to Vincent which is comprised of four items: (i) (Alleviation) How confident do you feel that this treatment can alleviate your complaint? (ii) (Recommendation) How confident would you be in recommending this treatment to a friend who suffered from similar complaints? (iii) (Logic) How logical does this treatment seem to you? (iv) (Other) How successful do you think this treatment would be in alleviating other complaints? SD, standard deviation; CI, 95% confidence interval.