Survival analysis of hospital length of stay of novel coronavirus (COVID-19) pneumonia patients in Sichuan, China

zhuo wang; John S. Ji; Yang Liu; Runyou Liu; Yuxin Zha; Xiaoyu Chang; Lun Zhang; Yu Zhang; Jing Zeng; Ting Dong; Xinyin Xu; Lijun Zhou; Jun He; Yin Deng; Bo Zhong; Xianping Wu

Diagnostic and treatment protocol for Novel Coronavirus Pneumonia (Trial version 7) was released by National Health Commission of the People's Republic of China, which specifies case definitions, diagnosis, differential diagnosis, treatment, laboratory assays and discharge criteria. 11 A confirmed case was defined by epidemiological history and/or clinical features that a suspected case may contact with COVID-19 infected persons and/or had symptoms and signs of COVID-19 infection, plus positive laboratory test including virus nucleic acid, gene sequencing and serum antibody detection. Clinical grades were divided into four levels: mild, common, heavy and severe, which we combined mild and common as mild illness and heavy and severe as severe illness. The mild or common type was characterized by mild symptoms, with or without fever, respiratory tract symptoms, and image manifestations of pneumonia. Heavy or severe cases were shortness of breath or low oxygen saturation, or even respiratory failure. Discharge criteria were: a. the body temperature returned to normal for more than 3 days; b. the respiratory symptoms improved significantly; c. the pulmonary imaging showed a significant improvement in acute exudative lesions; d. the nucleic acid tests were negative for two consecutive respiratory specimens (sampling interval at least 1 day). Hospital grades . CC-BY-NC-ND 4.0 International license It is made available under a author/funder, who has granted medRxiv a license to display the preprint in perpetuity.