Fig. 2
From: Sample size recalculation based on the prevalence in a randomized test-treatment study
Results for the power for the 1620 scenarios stratified by the difference in prevalence, the difference in sensitivity, and the difference in specificity. The power of the fixed design was compared to the adaptive design containing a re-estimation of the prevalence assuming μI+ = 0.05 (a-c) and μI+ = 0.1 (d-f). The black dotted line mark the theoretical power of 80%. The black bold line in the box marks the median value