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. Author manuscript; available in PMC: 2015 Nov 1.
Published in final edited form as: Alzheimers Dement. 2014 Apr 21;10(6):666–674. doi: 10.1016/j.jalz.2014.02.002

Figure 1.

Figure 1

Estimated sample size per group required to detect a 25% or 50% treatment effect with two-tailed p = 0.05 and 80% power in a randomized, placebo-controlled trial.