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. Author manuscript; available in PMC: 2014 Nov 1.
Published in final edited form as: Contemp Clin Trials. 2013 Sep 5;36(2):10.1016/j.cct.2013.08.013. doi: 10.1016/j.cct.2013.08.013

Table 4.

Power Calculations

Power/Effect Size Sample size for Standardized Effect size = 0.3 Sample size for Standardized Effect size = 0.4 Sample size for Standardized Effect size = 0.5
70% 500 285 186
80% 640 360 232
90% 860 480 308