Canadian Medical Guide > Analytical, Diagnostic and Therapeutic Techniques and Equipment > Investigative Techniques > Epidemiologic Methods > Epidemiologic Research Design > Sample Size Terms and Definitions

Sample Size

Medical Definition:	The number of units (persons, animals, patients, specified circumstances, etc.) in a population to be studied. The sample size should be big enough to have a high likelihood of detecting a true difference between two groups. (From Wassertheil-Smoller, Biostatistics and Epidemiology, 1990, p95)
Guide Notes:	NIM with specific population or circumstances sampled (IM); no qualif; not restricted to epidemiology

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