Figure 1From: Ankle manual therapy for individuals with post-acute ankle sprains: description of a randomized, placebo-controlled clinical trial Group size vs. effect size plot given d = .4 (arrow), β ≥ .80, and α = .05 for a 2-sample t-test. Optimal sample size occurs at n = 52 per group. Adding an additional 20% to group size to account for potential drop-outs, group size for this study was estimated at n = 63.Back to article page