Table 3.

Details Bias Risk Assessment using the ROBINS-1 tool for observational studies.

Estudios	Bias related to intervention	Bias of Lost Data	Bias of confusion	Bias in the outcome	Bias of reporting	Bias of selection	Risk of global bias
Chen et al 2020	Low	High	Moderate	Moderate	Low	Low	Moderate
Grasselli et al 2020	Moderate	Moderate	Low	Low	Low	Low	Low
Guan et al 2020	Low	Low	Low	Low	Low	Low	Low
Wang et al 2020	Moderate	Moderate	Low	Moderate	Low	Low	Moderate
Yang et al 2020	Low	Moderate	Low	Low	Low	Low	Low
Zhao et al 2020	Low	High	Low	Low	Low	Low	Low
Zhou et al 2020	Low	Low	Low	Low	Moderate	Moderate	Low