Predictors of severe and critical COVID-19: A systematic review

Table 1 Characteristics of the studies included

Study	Duration	Design	Country	Number	Male	Age	MINORs score
Li et al[11], 2020	Jan 2020- Feb 2020	Retrospective	China	83	44	45.5	14 (Low)
Zhou et al[12], 2020	Dec 2019- Jan 2020	Retrospective	China	191	119	56	13 (High)
Liu et al[13], 2020	Dec 2019- Jan 2020	Retrospective	China	78	39	38	12 (High)
Qu et al[14], 2020	Dec 2019- Jan 2020	Retrospective	China	30	16	50.5	13 (High)
Wu et al[15], 2020	Dec 2019- Jan 2020	Retrospective	China	201	128	51	12 (High)

MINORs: Methodological index for non-randomized studies.