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A study on the homogeneity of results in meta-analysis: Underwater exercise
Journal of the Korean Data & Information Science Society 2021;32:63-73
Published online January 31, 2021;  https://doi.org/10.7465/jkdi.2021.32.1.63
© 2021 Korean Data and Information Science Society.

Doo Hyung Lee1 · Jin Seo Kim2 · Young Seuk Cho3

123Department of Statistics, Pusan National University
Correspondence to: 1Master, Department of Statistics, Pusan National University, Busan 46241, Korea.
2Graduate student, Department of Statistics, Pusan National University, Busan 46241, Korea.
3Corresponding author: Professor, Department of Statistics, Pusan National University, Busan 46241, Korea. E-mail: choys@pusan.ac.kr

This work was supported by a 2-Year Research Grant of Pusan National University. This work was supported by the Phase Four of the Brain Korea 21 Project in 2020.
Received November 6, 2020; Revised December 18, 2020; Accepted December 20, 2020.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
Meta-analysis is the method of analyzing the results of studies on the same subject as one result through objective and systematic methods. The purpose of this study is to compare the results that have not been done with the consideration of the characteristics of the results in the meta-analysis of underwater exercise. The data used in the analysis were selected by 14 studies and the mean effect size of the weight-loss of the underwater exercise program was examined. The results showed that the mean effect size was -0.3747 (p-value=0.0696) for the meta-analysis method that did not take into account the characteristics of the pre-group, and that the mean effect size was -0.5126 (p-value= 0.0406) for the 11 studies that considered the pre-group characteristics. The results showed that there was a difference in statistical significance.
Keywords : Effect size, meta-analysis, underwater exercise.