Impact of non-alcoholic fatty liver disease on coronavirus disease 2019: A systematic review

Table 4 Quality assessment of included studies

Study name	Milic et al[29]	Huang et al[30]	Younossi et al[32]	Vázquez-Medina et al[33]	Moctezuma-Velázquez et al[34]	Nath et al[35]	Vrsaljko et al[36]	Wang et al[37]	Madan et al[38]	Zoncapè et al[39]	Brozat et al[31]
Selection (4)
Representativeness of the exposed cohort	1	1	1	1	1	1	1	1	1	1	1
Selection of the non-exposed cohort	1	1	1	1	1	1	1	1	1	1	1
Ascertainment of exposure	1	1	1	1	1	1	0	1	1	1	1
Demonstration that outcome of interest was not present at start of study	1	1	1	1	1	1	1	1	1	1	1
Comparability (2)
Comparability of cohorts on the basis of the design or analysis	1	2	2	1	2	2	1	2	2	2	2
Outcome (3)
Assessment of outcome	0	1	1	1	1	1	1	0	1	0	1
Was followed up long enough for outcomes to occur	1	0	0	1	0	1	1	1	1	0	1
Adequacy of follow-up of cohorts	0	1	0	1	1	1	1	1	1	1	1
Total (9)	6	8	7	8	8	9	7	8	9	7	9