Table 1.

Characteristics of the included studies on COVID-19, 2020.

Author	N	Males [N (%)]	Mean age	Quality score	Country
Gao Y et al.	43	26(60.5)	–	17	China
Liu M et al.	30	–	–	14	China
Liu Y et al.	76	49(64.5)	45	17	China
Wan S et al.	135	72(53.3)	46	18	China
Xu B et al.	145	76(52.4)	–	18	China
Zhang G et al.	221	108(48.9)	53	16	China
Zhang J et al.	140	71(50.7)	56	16	China
Huang C et al.	41	30(73.2)	49	19	China
Lei S et al.	34	14(41.2)	54	18	China
Peng Y et al.	112	53(47.3)	61	16	China
Wang D et al.	138	75(54.3)	55	19	China
Li D et al.	183	98(53.6)	54	17	China
Tang N et al.	449	268(59.7)	65	18	China
Wang L et al.	339	166(49.0)	70	19	China
Zhou F et al.	191	119(62.3)	56	16	China

–, Not available, not reported.