Analyzing patient-reported outcome data when completion differs between arms in open-label trials: an application of principal stratification.
Jessica K RoydhouseRoee GutmanVishal BhatnagarPaul G KluetzRajeshwari SridharaPallavi S Mishra-KalyaniPublished in: Pharmacoepidemiology and drug safety (2019)
The principal stratification estimand may be a useful additional analysis, especially if PRO completion differs between arms.