Abstract:
INTRODUCTION:In this study we explore several methods for incorporating survival information in the analysis of Amyotrophic Lateral Sclerosis Functional Rating Scale (ALSFRS) scores. METHODS:ALSFRS scores and patient survival times were simulated based on estimates from a recent clinical trial. Six analysis approaches were applied to the data. Each approach was based on ALSFRS scores, the survival time, or a combination of the 2. The power of each approach to detect potential treatment effects was estimated. RESULTS:When the treatment acted solely on the change in ALSFRS, the shared parameter model provided the most power, although all of the models based on random effects were similar. As the effect on survival increased, rank-based analysis showed potential gains in power. Survival analysis was superior under a small effect on ALSFRS and a larger effect on mortality. CONCLUSIONS:The shared parameter model and rank-based approach can offer improvements in power over traditional approaches.
journal_name
Muscle Nervejournal_title
Muscle & nerveauthors
Healy BC,Schoenfeld Ddoi
10.1002/mus.23392subject
Has Abstractpub_date
2012-10-01 00:00:00pages
506-11issue
4eissn
0148-639Xissn
1097-4598journal_volume
46pub_type
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