COVID-19 vaccination coverage by company size and the effects of workplace vaccination program in Japan: a cohort study.

"Declarations Ethical approval and consent to participateThis study was approved by the ethics committee of the University of Occupational and Environmental Health, Japan (reference nos. R2-079 and R3-006). Informed consent was obtained from all participants via the survey website. Consent for publicationNot applicable. Availability of data and materialData available on request from authors. Competing interestsThe authors declare that they have no competing interests. FundingThe study was supported and partly funded by research grants from the University of Occupational and Environmental Health, Japan (no grant number), the Japanese Ministry of Health, Labour and Welfare (H30-josei-ippan-002, H30-roudou-ippan-007, 19JA1004, 20JA1006, 210301-1, and 20HB1004), Anshin Zaidan (no grant number), the Collabo-Health Study Group (no grant number), Hitachi Systems, Ltd. (no grant number), and scholarship donations from Chugai Pharmaceutical Co., Ltd. (no grant number). The funders were not involved in the study design, collection, analysis, or interpretation of data, the writing of this article, or the decision to submit it for publication. Authors’ contributionsKM designed the analysis, analyzed the data, and wrote the manuscript. TM designed the analysis and reviewed the manuscript. TN created the questionnaire, advised on the study design and data interpretation, and reviewed the manuscript. HA, AH, ST, MT, and SM reviewed the manuscript and advised on the data interpretation. YF was chairperson of the study group, created the questionnaire, advised on the data interpretation, and reviewed the manuscript. AcknowledgmentsThe current members of the CORoNa Work Study, in alphabetical order, are as follows: Dr. Hajime Ando, Dr. Hisashi Eguchi, Dr. Yoshihisa Fujino (present chairperson of the study group), Dr. Arisa Harada, Dr. Ayako Hino, Dr. Kazunori Ikegami, Dr. Tomohiro Ishimaru, Dr. Kyoko Kitagawa, Ms. Ning Liu, Dr. Kosuke Mafune, Dr. Shinya Matsuda, Dr. Ryutaro Matsugaki, Dr. Koji Mori, Dr. Keiji Muramatsu, Dr. Masako Nagata, Dr. Tomohisa Nagata, Dr. Akira Ogami, Dr. Makoto Okawara, Dr. Rie Tanaka, Dr. Seiichiro Tateishi, Dr. Shinya Matsuda, Dr. Tomohiro Ishimaru, and Dr. Tomohisa Nagata. All members are affiliated with the University of Occupational and Environmental Health, Japan. We also thank Katherine Thieltges from Edanz (https://jp.edanz.com/ac) for editing a draft of this manuscript. Competing interests The authors declare that they have no competing interests."

"Funding The study was supported and partly funded by research grants from the University of Occupational and Environmental Health, Japan (no grant number), the Japanese Ministry of Health, Labour and Welfare (H30-josei-ippan-002, H30-roudou-ippan-007, 19JA1004, 20JA1006, 210301-1, and 20HB1004), Anshin Zaidan (no grant number), the Collabo-Health Study Group (no grant number), Hitachi Systems, Ltd. (no grant number), and scholarship donations from Chugai Pharmaceutical Co., Ltd. (no grant number). The funders were not involved in the study design, collection, analysis, or interpretation of data, the writing of this article, or the decision to submit it for publication."

"Trial registration Not applicable."