Effects of CBT on SADThe 48 comparisons between CBTand a control condition148-183 resulted in a pooled effect size of g50.88 (95% CI: 0.74-1.03; I2564; NNT53.22). Again, the large majority of studies used a waiting list control group (N540), with only three using care-as- usual and five pill placebo. The studies using a waiting list con- trol group resulted in significantly (p