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This study aims at developing a method of estimating an optimal sample size for use in health and medical research and studies.The paper is designed as a tool that a researcher could use in planning and conducting good quality research and gives a discussion of various aspects of sample size consideration in medical research.The paper also covers the essentials in calculating power and sample size for a variety of applied study designs.Sample size computation for survey type of studies, observation studies and experimental studies based on means and proportions or rates, sensitivityspecificity tests for assessing the categorical outcome are presented in detail.Recently, considerable interest has been focused on medical research after the beginning of COVID-19 pandemic.The resulting literature is scattered over many sources.This paper aimed at giving some contributions in this field.
Elsayir et al. (Wed,) studied this question.