Tehran University of Medical Sciences Nursing Practice Today 2383-1154 7 1 2020 01 01 5 11 Mahdieh Arian Student Research Committee, Faculty of Nursing and Midwifery, Semnan University of Medical Sciences, Semnan, Iran Mohsen Soleimani Nursing Care Research Center, Nursing and Midwifery Faculty, Semnan University of Medical Sciences, Semnan, Iran 2019 07 09 2019 09 15 In order to perform the data analysis process, mean value and variance  or standard deviation  are required in a meta-analysis study for integrating data. However, sometimes reports published from studies only report Median, Range and Sample size. When no indication of the distribution of primary data (normal distribution or lack of normal distribution) is available, items such as mean and variance and standard deviation can be estimated based on simple formulas . The purpose of this article is merely to introduce proven formulas with applied examples. https://npt.tums.ac.ir/index.php/npt/article/view/710 https://npt.tums.ac.ir/index.php/npt/article/download/710/427