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J Korean Soc Ther Radiol Oncol. 2008 Dec;26(4):289-294. Korean. Original Article.
Park HC , Choi DH , Ahn SV , Kang JO , Kim ES , Park W , Ahn SD , Yang DS , Yun HG , Chung EJ , Chie EK , Pyo H , Hong S .
Department of Radiation Oncology, Sungkyunkwan University School of Medicine, Seoul, Korea. dohochoi@skku.edu
Yonsei University College of Medicine, Seoul, Korea.
Department of Radiation Oncology, Kyung Hee University School of Medicine, Seoul, Korea.
Department of Radiation Oncology, Soonchunhyang University College of Medicine, Asan, Korea.
Department of Radiation Oncology, University of Ulsan College of Medicine, Ulsan, Korea.
Department of Radiation Oncology, Korea University College of Medicine, Seoul, Korea.
Department of Radiation Oncology, Dongguk University College of Medicine, Seoul, Korea.
Department of Radiation Oncology, NHIC Ilsan Hospital, Goyang, Korea.
Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.
Proton Therapy Center National Cancer Center, Goyang, korea.
Department of Radiation Oncology, Konkuk University School of Medicine, Seoul, Korea.
Abstract

PURPOSE: To improve the quality of the statistical analysis of papers published in the Journal of the Korean Society for Therapeutic Radiology and Oncology (JKOSTRO) by evaluating commonly encountered errors. MATERIALS AND METHODS: Papers published in the JKOSTRO from January 2006 to December 2007 were reviewed for methodological and statistical validity using a modified version of Ahn's checklist. A statistician reviewed individual papers and evaluated the list items in the checklist for each paper. To avoid the potential assessment error by the statistician who lacks expertise in the field of radiation oncology; the editorial board of the JKOSTRO reviewed each checklist for individual articles. A frequency analysis of the list items was performed using SAS (version 9.0, SAS Institute, NC, USA) software. RESULTS: A total of 73 papers including 5 case reports and 68 original articles were reviewed. Inferential statistics was used in 46 papers. The most commonly adopted statistical methodology was a survival analysis (58.7%). Only 19% of papers were free of statistical errors. Errors of omission were encountered in 34 (50.0%) papers. Errors of commission were encountered in 35 (51.5%) papers. Twenty-one papers (30.9%) had both errors of omission and commission. CONCLUSION: A variety of statistical errors were encountered in papers published in the JKOSTRO. The current study suggests that a more thorough review of the statistical analysis is needed for manuscripts submitted in the JKOSTRO.

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