the effect size in the 10 positive studies ranged
from 0.26-1.83 (mean 0.64; median 0.48). Per
clinical convention, mean values in the 0.6-0.7
range reflect a moderately large effect size.
Excluding the two outlier studies (the highest and
lowest effect sizes from the group of 10 positive
studies) reduces the mean effect size only slightly
(to 0.54), a figure that is still consistent with a
moderate-to-moderately large effect size