Indian Journal of Urology Users online:278  
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Year : 2011  |  Volume : 27  |  Issue : 4  |  Page : 503-507

Sample size matters: A guide for urologists

Division of Urology, University of Texas Medical School at Houston, Houston, Texas, USA

Correspondence Address:
Steven E Canfield
6431 Fannin, MSB 6.018, Houston, TX 77030
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/0970-1591.91442

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Understanding sample size calculation is vitally important for planning and conducting clinical research, and critically appraising literature. The purpose of this paper is to present basic statistical concepts and tenets of study design pertaining to calculation of requisite sample size. This paper also discusses the significance of sample size calculation in the context of ethical considerations. Scenarios applicable to urology are utilized in presenting concepts.

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