کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1083805 951025 2008 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Efficient ways exist to obtain the optimal sample size in clinical trials in rare diseases
موضوعات مرتبط
علوم پزشکی و سلامت پزشکی و دندانپزشکی سیاست های بهداشت و سلامت عمومی
پیش نمایش صفحه اول مقاله
Efficient ways exist to obtain the optimal sample size in clinical trials in rare diseases
چکیده انگلیسی

ObjectiveRecruitment of pediatric patients in randomized clinical trials is hampered by the rarity of many conditions and by ethical constraints. The objective of this paper is to give an overview of design options to obtain a statistically valid result while including a minimum number of subjects.Study Design and SettingOverview and discussion of several approaches to conduct valid randomized clinical trials in rare diseases and vulnerable populations.ResultsSequential designs have been developed as efficient ways to evaluate accumulating information from a clinical trial, thereby reducing the average size of trials. Different sequential procedures exist, including group sequential designs, boundaries designs, and adaptive designs. The sample size attained at the end of the trial is unknown at the start. The sample size for a given set of α, β, and effect size may turn out to be larger than with a classical fixed sample size approach. Simulations have shown that on average, sample sizes are smaller.ConclusionThere are several possibilities to optimize the number of subjects in a clinical trial. The rarity of many disorders in children and the ethical requirements in this patient population should not obstruct the performance of well-designed research to support clinical decision making.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Clinical Epidemiology - Volume 61, Issue 4, April 2008, Pages 324–330
نویسندگان
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