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- Title
Sample size considerations for clinical research studies in nuclear cardiology.
- Authors
Chiuzan, Cody; West, Erin; Duong, Jimmy; Cheung, Ken; Einstein, Andrew; West, Erin A; Cheung, Ken Y K; Einstein, Andrew J
- Abstract
Sample size calculation is an important element of research design that investigators need to consider in the planning stage of the study. Funding agencies and research review panels request a power analysis, for example, to determine the minimum number of subjects needed for an experiment to be informative. Calculating the right sample size is crucial to gaining accurate information and ensures that research resources are used efficiently and ethically. The simple question "How many subjects do I need?" does not always have a simple answer. Before calculating the sample size requirements, a researcher must address several aspects, such as purpose of the research (descriptive or comparative), type of samples (one or more groups), and data being collected (continuous or categorical). In this article, we describe some of the most frequent methods for calculating the sample size with examples from nuclear cardiology research, including for t tests, analysis of variance (ANOVA), non-parametric tests, correlation, Chi-squared tests, and survival analysis. For the ease of implementation, several examples are also illustrated via user-friendly free statistical software.
- Subjects
CARDIAC radionuclide imaging; ACQUISITION of data; DATA analysis; ANALYSIS of variance; T-test (Statistics); STATISTICAL correlation; STATISTICAL software; CARDIOLOGY; CLINICAL trials; COMPUTER simulation; EXPERIMENTAL design; NUCLEAR medicine; STATISTICS; SAMPLE size (Statistics); STATISTICAL models
- Publication
Journal of Nuclear Cardiology, 2015, Vol 22, Issue 6, p1300
- ISSN
1071-3581
- Publication type
journal article
- DOI
10.1007/s12350-015-0256-7