Table 1. Baseline characteristics of studies included in our analysis.

Author & year	Country	City	Hospital	Sample size		Outcome measure	NOS
				Severe	Mild
Bai et al. 2020 26	China	Wuhan	Jinyintan Hospital	91	36	Died vs. cured	7
Cai et al. 2020 27	China	Shenzen	Third people's Hospital	58	240	Severe vs. non severe	9
Chen et al. 2020 28	China	Wuhan	Tongji hospital	11	10	Severe vs. moderate	9
Chen et al. 2020 29	China	Mixed	Multicenter	50	241	Severe vs. mild-moderate	9
Chen et al. 2020 30	China	Wuhan	Zhongnan Hospital	14	11	Viral clearance vs. without viral clearance	9
Duan et al. 2020 31	China	Wuhan	Wuhan Pulmonary Hospital	44	72	Uncured vs. cured	9
Gao et al. 2020 32	China	Fuyang	Second People's Hospital	15	28	Severe vs. mild	7
Guan et al. 2020 33	China	Guangdong	National Health Commision of China	926	173	Severe vs. non-severe	7
Huang et al. 2020 34	China	Wuhan	Jinyintan hospital	13	28	ICU vs. non-ICU	9
Jian-Ya et al. 2020 35	China	Chongqing	Three Gorges Hospital	7	44	Severe vs. non severe	9
Liu et al. 2020 36	China	Wuhan	Union Hospital	69	69	Severe vs. non severe	7
Shi et al. 2020 37	China	Wuhan	Renmin Hospital	48	53	Died <3 d vs. >3 d	9
Wang et al. 2020 38	China	Mixed	Multicenter	50	115	CT imaging score >11 vs. <11	8
Wang et al. 2020 39	China	Wuhan	Wuhan First People's Hospital	22	283	Survivor vs. non-survivor	8
Wang et al. 2020 43	China	Wuhan	Zhongnan Hospital	36	102	ICU vs. non-ICU	9
Xu et al. 2020 40	China	Mixed	Multicenter	25	44	Severe vs. mild	8
Zhang et al. 2020 41	China	Wuhan	Zhongnan Hospital	55	166	Severe vs. non-severe	9
Zhang et al. 2020 44	China	Wuhan	Wuhan Seventh Hospital	56	82	Severe vs. non-severe	7
Zhou et al. 2020 42	China	Wuhan	Wuhan Pulmonary Hospital	54	137	Survivor vs. non-survivor	8

Note: ICU, intensive care unit; CT, computed tomography; NOS, Newcastle Ottawa Scale.