Electrocardiogram abnormalities in residents in cold homes: a cross-sectional analysis of the nationwide Smart Wellness Housing survey in Japan.

"Declarations Ethics approval and consent to participateThe study was conducted according to the guidelines of the Declaration of Helsinki, and approved by the Ethics Committee of Hattori Clinic Ethics Review Board (approval number S1410-J03; date of approval: 14 Oct 2014). Informed consent was obtained from all subjects involved in the study. Consent for publicationNot applicable. Competing interestsTI has received research grants from Tokyo Gas Co., Ltd., Osaka Gas Co., Ltd., HyAS & Co. Inc., Fuyo Home Co. Ltd., Asahi Kasei Homes Corp., OM Solar Co. Inc., Kajima Corp., Shimizu Corp., Nice Corp., Japan Gas Association, and Japan Sustainable Building Consortium. KK has received a research grant from Omron Healthcare Co., Ltd. YF has reported grants and personal fees from Saibugas Co., Ltd. MS has received non-restrictive research funds from Taiyo Nippon Sanso Corp. TH has received honorarium from LIXIL Corp. The above grants/funds/honorarium have been received outside the submitted work. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results. Competing interests TI has received research grants from Tokyo Gas Co., Ltd., Osaka Gas Co., Ltd., HyAS & Co. Inc., Fuyo Home Co. Ltd., Asahi Kasei Homes Corp., OM Solar Co. Inc., Kajima Corp., Shimizu Corp., Nice Corp., Japan Gas Association, and Japan Sustainable Building Consortium. KK has received a research grant from Omron Healthcare Co., Ltd. YF has reported grants and personal fees from Saibugas Co., Ltd. MS has received non-restrictive research funds from Taiyo Nippon Sanso Corp. TH has received honorarium from LIXIL Corp. The above grants/funds/honorarium have been received outside the submitted work. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results."

"Funding This study was partly supported by the Ministry of Land, Infrastructure, Transport, and Tourism as part of the Model Project for Promotion of SWH and a JSPS KAKENHI [Grant Numbers JP17H06151: Principal Investigator: Prof. Toshiharu Ikaga]. Funding organizations had no role in deciding the study design and conducting the study; collection, management, analysis, and interpretation of the data; preparation of the article; or the decision to submit the article for publication."

"Trial registration The trial was retrospectively registered on 27 Dec 2017 to the University hospital Medical Information Network Clinical Trials Registry (UMIN-CTR, https://www.umin.ac.jp/ctr/, registration identifier number UMIN000030601)."