Table 1. Main characteristics of the included studies in our-analysis.

Study	Year	Country	Sample	Median Age (years)	Sex		Diseases severity		Basis of disease severity	NOS
					Men	Women	Non-severe	Severe
C.Huang	2020	China	41	49.0 (41.0–58.0)	30	11	28	13	ICU care	7
D.Wang	2020	China	138	56.0 (42.0-68.0)	75	63	102	36	ICU care	7
W.Guan	2020	China	1099	47.0 (35.0–58.0)	640	459	926	173	clinical symptoms	8
W.Liu	2020	China	78	38.0 (33.0-57.0)	39	39	67	11	clinical symptoms	7
X.Xu	2020	China	62	41.0 (32.0-52.0)	36	26	29	33	clinical symptoms	6
J.Zhang	2020	China	140	57.0 (25.0-87.0)	71	69	82	58	clinical symptoms	7

NOS, Newcastle-Ottawa Scale.