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Tsutomu SUZUKI1, 10), Takao OKADA1)Makino WATANABE1, 6), Hiroo WADA1, 7), Yuji NISHIZAKI1, 8, 9), 1)Division of Medical Education, Juntendo University Faculty of Medicine, Tokyo, Japan5)Department of Microbiology, Juntendo University Faculty of Medicine, Tokyo, Japan2)Department of Coloproctological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan4)Department of Pediatrics and Adolescent Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan3)Department of Esophageal and Gastroenterological Surgery, Juntendo University Faculty of Medicine, Tokyo, Japan7)Department of Public Health, Juntendo University Faculty of Medicine, Tokyo, Japan8)Department of General Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan6)Department of Organ and Cell Physiology, Juntendo University Faculty of Medicine, Tokyo, Japan9)Department of Cardiovascular Biology and Medicine, Juntendo University Faculty of Medicine, Tokyo, JapanYuichi TOMIKI1, 2), Motomi NASU1, 3), Amane ENDO1, 4), Miwa SEKINE1, 5), Corresponding author: Yuichi Tomiki (ORCiD: orcid.org/0000-0001-9284-905X)Division of Medical Education, Juntendo University Faculty of Medicine2-1-1 Hongo, Bunkyo-ku, Tokyo 113-8421, JapanTEL: +81-3-3813-3111　E-mail: tomiki@juntendo.ac.jp〔Received　Nov. 3, 2021〕〔Accepted　Dec. 24, 2021〕J-STAGE Advance published date: Feb. 16, 2022Copyright © 2022 The Juntendo Medical Society. This is an open access article distributed under the terms of Creative Commons Attribution License (CC BY), which permits unrestricted use, distribution, and reproduction in any medium, provided the original source is properly credited. doi: 10.14789/jmj.JMJ21-0037-OAObjective: The present study compared students’ CBT scores during the 2-year period before (“without COVID-19”) and 2-year period during (“with COVID-19”) the COVID-19 pandemic, and analyzed factors associated with poor results.Materials: A total of 530 students (368 males and 162 females), who had taken CBT within the period between 2018 and 2021.Methods: Analysis was performed based on the questionnaire results, and the students’ performance was compared between “without/with COVID-19” to identify the causes of poor CBT scores.Results: The overall mean IRT score was 515.5±85.4. The without and with COVID-19 groups’ scores were 495.7±85.9 and 534.4±80.8, respectively (p<0.01). Among all students, 43 (8.1%) had IRT scores lower than 400 as poor CBT scores; 27 (10.4 %) without and 16 (5.9 %) with COVID-19, revealing a decrease in the latter. The multivariate analysis of the risk of students having poor CBT scores showed that students with poor performance during the third year (odds ratio:7.02), starting preparation for CBT late (2.19), and not taking any practice examination (4.58) are more likely to have poor CBT results.Conclusions: Due to the COVID-19 pandemic, students spent more time on online home study, and this may have consequently improved their CBT scores. Such learning performance is desirable for medical students, but they have lost the opportunity to gain valuable experiences that they could have acquired through extracurricular activities, such as club activities. In this respect, we cannot simply be pleased by the improvement in students’ CBT scores.Key words: CBT, COVID-19, online lecture, self-learning, extracurricular activityJuntendo Medical Journal2022. 68(2), 131-139Original articlesRisk Factors Associated with Poor Computer-based Testing (CBT) Scores - Comparing Students’ Performance “Without/With COVID-19” and Backgrounds -10)Department of Respiratory Medicine, Juntendo University Faculty of Medicine, Tokyo, Japan131