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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/14162

Title: Correcting for cross-over bias in randomized controlled clinical trials
Authors: Natukunda, Agnes
Advisors: SHKEDY, Ziv
Issue Date: 2012
Publisher: tUL Diepenbeek
Abstract: Ideally, therapeutic interventions are evaluated through randomized clinical trials. These trials are commonly analysed with an intent-to-treat (ITT) approach, whereby patients are analyzed in their assigned treatment group regardless of actual treatment received. If an interim analysis of such trials demonstrates compelling evidence of a difference in benefit, ethical considerations often dictate that the trial be unblinded and participants be provided access to the more efficacious agent. Because interim analysis may not address longer-term outcomes of interest, important clinical questions such as overall survival benefit'the ultimate test of efficacy to many'may remain unanswered. The ensuing crossover disturbs randomization and may lead to biased longer-term analysis, compromising the utility of clinical data. In this thesis, I discuss the biases associated with ITT analysis and, alternatively, censoring of follow-up data after selective crossover. Moreover, discussed also is how
Notes: Master of Statistics-Biostatistics
URI: http://hdl.handle.net/1942/14162
Category: T2
Type: Theses and Dissertations
Appears in Collections: Master theses

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