Background: Although sex differences in the prevalence of sleep disordered breathing (SDB) is recognized, whether a sex difference exists among obese individuals with SDB with or without comorbidities has not been well investigated. This study aimed to explore the relationships of sex differences among SDB, obesity, and metabolic comorbidities., Methods: This study evaluated 7713 community participants with nocturnal oximetry ≥2 nights. SDB was assessed by the 3% oxygen desaturation index corrected for sleep duration obtained by wrist actigraphy (Acti-ODI3%), and moderate-to-severe SDB was defined as Acti-ODI3% levels ≥15/h. Obesity was defined as body mass index ≥25 kg/m 2 ., Results: The prevalence of moderate-to-severe SDB was 21.6%/0% among those with obesity/without obesity in women under 40 years old. The adjusted odds ratios for moderate-to-severe SDB in those with both diabetes/metabolic syndrome and obesity compared to others were 86.4 (95%CI 24.2-308.8)/40.4 (95%CI 15.0-108.8) in pre-menopausal women. The association among SDB, obesity, and metabolic comorbidities showed significant interactions between pre-menopausal women and men or post-menopausal women., Conclusions: Sex differences exist among the prevalence of SDB and the relationships among SDB, obesity, and metabolic comorbidities. Especially, pre-menopausal women are more vulnerable to the consequences of obesity. SDB prevalence may be impacted by the coexistence of obesity and diabetes or metabolic syndrome in pre-menopausal women., Competing Interests: Conflicts of interest Takeshi Matsumoto, Takuma Minami, Osamu Kanai, Kiminobu Tanizawa, Tomoko Wakamura, Naoko Komenami, Kazuya Setoh, Takahisa Kawaguchi, Satoshi Morita, Yoshimitsu Takahashi, and Toyohiro Hirai have nothing to disclosure. Hironobu Sunadome and Naomi Takahashi reports grants from Philips Japan, grants from ResMed, grants from Fukuda Denshi, grants from Fukuda Lifetec Keiji, outside the submitted work. Kimihiko Murase reports grants from Philips Japan, grants from Teijin Pharma, grants from Fukuda Denshi, grants from Fukuda Lifetec Keiji, outside the submitted work. Yasuharu Tabara reports grants from the Ministry of Education, Culture, Sports, Science & Technology in Japan, grants from Japan Science and Technology Agency, grants from Mitsubishi Foundation, grants from Daiwa Securities Health Foundation, and grants from Sumitomo Foundation, outside the submitted work. Satoshi Hamada reports grants from Teijin Pharma, outside the submitted work. Takeo Nakayama reports grants from Special Health Check-up Research Group from the Ministry of Health, Labor and Welfare of Japan, personal fees from Pfizer Japan Inc., personal fees from MSD K.K., personal fees from Ohtsuka Pharmaceutical co., personal fees from Dainippon Sumitomo Pharmaceutical co., personal fees from Ono Pharmaceutical co., personal fees from Chugai Pharmaceutical co., personal fees from Dentsu co., personal fees from Takeda Pharmaceutical co., personal fees from Novo Nordisk Pharma. co., personal fees from Janssen Pharmaceutical K.K., personal fees from Boehringer Ingelheim International GmbH, personal fees from Nikkei Business Publications, Inc., personal fees from Eli Lilly Japan K.K., personal fees from Novartis Pharma K.K., personal fees from Baxter, personal fees from Alexion Pharma, personal fees from Mitsubishi Tanabe Pharma Corporation, grants for the collaborative study from HANSHIN Dispensing Holding Co. Ltd., grants from Nakagawa Pharmacy Co., Ltd., grants from Konica Minolta, Inc., donations for the department from Nakamura hospital, donations from Japan Medical Data Center Toyota, donations from Tsusho All Life Co., outside the submitted work. Susumu Sato reports grants from Philips Japan, ResMed, Fukuda Denshi, Fukuda Lifetec Keiji, Fuji Film corporation and Nippon Boehringer Ingelheim, outside the submitted work. Fumihiko Matsuda reports grants from Kyoto University, grants from the Ministry of Education, Culture, Sports, Science and Technology in Japan, grants from the Center of Innovation Program, grants from Japan Science and Technology Agency, from the Practical Research Project for Rare/Intractable Diseases, during the conduct of the study. Kazuo Chin reports grants from the Japanese Ministry of Education, Culture, Sports, Science and Technology, grants from the Intractable Respiratory Diseases and Pulmonary Hypertension Research Group, the Ministry of Health, Labor and Welfare, Japan, grants from the Japan Vascular Disease Research Foundation, grants from Health, Labour and Welfare Sciences Research Grants, Research on Region Medical, during the conduct of the study; grants and personal fees from Philips Japan, grants and personal fees from Teijin Pharma, grants and personal fees from Fukuda Denshi, grants and personal fees from Fukuda Lifetec Keiji, grants from KYORIN Pharmaceutical Co., Ltd, grants from Nippon Boehringer Ingelheim Co., Ltd, grants and personal fees from GlaxoSmithKline, personal fees from MSD, personal fees from Resmed, personal fees from Astellas Pharma, personal fees from Eisai Co., Ltd., outside the submitted work., (Copyright © 2024. Published by Elsevier B.V.)