Table 1.

Characteristics of the included studies on COVID-19, 2020. All patients confirmed by real-time RT-PCR.

Author	Journal	Date (MM/DD)	Country	Study type	N	Quality scorea	Reference
WMCHHHPNCI	Commission Report	01/20	China	Cross-sectional	136	12	[64]
Chaolin et al.	Lancet	01/24	China	Cross-sectional	41	19	[5]
Li et al.	NEJM	01/29	China	Cross-sectional	425	19	[11]
Chen et al.	Lancet	01/30	China	Cross-sectional	99	19	[4]
Chung et al.	Radiology	02/04	China	Cross-sectional	21	12	[65]
Chen et al.	Chin J Tuberc Respir Dis	02/06	China	Cross-sectional	29	12	[66]
Wang et al.	JAMA	02/07	China	Cross-sectional	138	19	[67]
Kui et al.	Chin Med J	02/07	China	Cross-sectional	137	12	[68]
Chang et al.	JAMA	02/07	China	Cross-sectional	13	14	[69]
To et al.	Clin Infect Dis	02/12	China	Cross-sectional	12	14	[70]
COVID-19 team Australia	Team Report	02/12	Australia	Cross-sectional	15	12	[71]
Yueying et al.	Eur Radiol	02/13	China	Cross-sectional	63	14	[72]
Li et al.	Preprint Lancet	02/13	China	Case series	24	14	[73]
Feng et al.	Radiology	02/13	China	Case series	21	12	[74]
Liang et al.	Lancet Oncology	02/14	China	Cross-sectional	1590	17	[41]
Zhang et al.	Chin J Tuberc Respir Dis	02/15	China	Case series	9	12	[40]
Feng et al.	Chin J Pediatr	02/17	China	Case series	15	12	[75]
Wang et al.	Chin J Pediatr	02/17	China	Cross-sectional	34	12	[76]
Xiaobo et al.	Lancet Respir Med	02/21	China	Cross-sectional	52	17	[52]

WMCHHHPNCI, Wuhan Municipal Commission of Health and Health on Pneumonia of New Coronavirus Infection. MM/DD, Month, Day.

^aQuality score ranged, 0–20. Based on the Appraisal Tool for Cross-Sectional Studies, AXIS [36].