Fig. 4

Analysis techniques used in the GAS studies reviewed. A All but one study calculated the GAS score with the traditional T-score formula. B Different statistical tests of significance were used, with the Student’s or unequal variance t-test being the most common. C Effect sizes were measured as the mean change score, Cohen’s d or the standardized response mean. Bar graphs depict the number of studies with each analytic technique. Where the sample size was greater than 21 (panel B), more than one analysis technique was used