Fig. 2From: Choice of futility boundaries for group sequential designs with two endpointsLower bounds for β γ-admissible futility boundaries (yellow, orange and red dots) and β γ-optimal futility boundaries (green dot with coordinates as indicated by the dotted lines) for the composite endpoint and the main component for Approach 1 (left plot), Approach 2 (middle plot), and Approach 3 (right plot)Back to article page