Figure 3
From: Designing cost-efficient randomized trials by using flexible recruitment strategies
Plots of optimum total costs (A) and sample sizes (B) as a function of screening severity threshold a . The solid vertical lines indicate the optimum screening severity threshold for minimum total cost under the two stage procedure. The dashed vertical line indicates the optimum screening severity threshold for minimum total cost under the single stage procedure. In B, the gray solid line is the screening sample size under the single stage procedure.