:: Volume 2, Issue 4 (1-2011) ::
Caspian J Intern Med 2011, 2(4): 289-298 Back to browse issues page
Sample size estimation in epidemiologic studies
Karimollah Hajian-Tilaki *
Abstract:   (7580 Views)
This review basically provided a conceptual framework for sample size calculation in epidemiologic studies with various designs and outcomes. The formula requirement of sample size was drawn based on statistical principles for both descriptive and comparative studies. The required sample size was estimated and presented graphically with different effect sizes and power of statistical test at 95% confidence level. This would help the clinicians to decide and ascertain a suitable sample size in research protocol in order to detect an effect of interest.
Keywords: Sample size, Comparative studies, Continuous outcome, Binary outcome, Effect size, Statistical power
Full-Text [PDF 254 kb]   (4616 Downloads)    
Type of Study: Original Article | Subject: Infectious Diseases
Received: 2014/01/15 | Accepted: 2014/01/15 | Published: 2014/01/15


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Volume 2, Issue 4 (1-2011) Back to browse issues page