Announcing a new publication for Acta Materia Medica journal. In clinical trials, the primary analysis is often either a test of absolute/relative change in a measured outcome or a corresponding responder analysis. Although each of these tests may be reasonable, determining which test is most suitable for a particular research study remains an open question. These tests may require different sample sizes or define different clinically meaningful differences; most importantly, they may lead to different study conclusions.
The aim of this study was to compare a typical non-inferiority test using absolute change as the study endpoint to the corresponding responder analysis in terms of sample-size requirements, statistical power, and hypothesis-testing results. From numerical analysis, using absolute change as an endpoint generally requires a larger sample size; therefore, when the sample size is the same, the responder analysis has higher power. The cut-off value and non-inferiority margin are critical and can meaningfully affect whether the two types of endpoints yield conflicting conclusions. Specifically, extreme cut-off values are more likely to yield different conclusions. However, this influence decreases as population variance increases. One important reason for conflicting conclusions is a non-normal population distribution.
To eliminate conflicting results, researchers should consider the population distribution and cut-off value selection.
Article Reference: Peijin Wang, Sarah Peskoe and Rebecca Byrd et al. Statistical evaluation of absolute change versus responder analysis in clinical trials. Acta Materia Medica. Vol. 1(3):320-332. DOI: 10.15212/AMM-2022-0020
Keywords: primary endpoints, responder analysis, threshold selection
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