Child psychopharmacology, effect sizes, and the big bang
Martin, A., Gilliam, W. S., Bostic, J. Q., & Rey, J. M. (2005). Child psychopharmacology, effect sizes, and the big bang. American Journal of Psychiatry, 162(4), 817.
To the Editor: We read with interest the article by Karen Dineen Wagner, M.D., Ph.D., et al. (1) in the June issue. In their study comparing citalopram to placebo, we were surprised to find the authors reporting an overall effect size of 2.9. With the commonly cited criteria set forth by Cohen, effect sizes can be considered trivial (<0.2), small (0.2 to <0.5), moderate (0.5 to 0.8), or large (>0.80).