Phase angle as a predictor of mortality in elderly patients with multimorbidity: a matched case-control study 1Elderly Demonstration Ward, Beijing Geriatric Hospital, Beijing, China 2Beijing lnstitute of Integrative Medicine Geriatrics, Beijing Geriatric Hospital, Beijing, China DOI 10.7717/peerj.18592 Academic Editor Rohit Upadhyay Subject Areas Emergency and Critical Care, Epidemiology, Geriatrics, Palliative Care Keywords Phase angle, Bioelectrical impedance analysis, Elderly,...