Efficacy and safety of tenofovir disoproxil fumarate versus entecavir in the treatment of acute-on-chronic liver failure with hepatitis B: a systematic review and meta-analysis

Table 2 Quality evaluation of the included cohort studies via the NOS

Studies	Representativeness of the exposed cohort	Selection of the nonexposed cohort	Ascertainment of exposure	Outcome not present at baseline	Control for age and sex	Control for other confounding factors	Assessment of outcome	Enough long follow-up duration	Adequacy of follow-up of cohort	Total
Hossain et al. [17]	⁎	⁎	⁎	⁎	⁎		⁎			6
Zhang et al. [13]		⁎	⁎	⁎	⁎	⁎	⁎		⁎	7
Zhang et al. [16]	⁎	⁎	⁎	⁎	⁎		⁎	⁎	⁎	8
Li et al. [14]	⁎	⁎		⁎	⁎	⁎	⁎	⁎	⁎	8
Wan et al. [15]	⁎	⁎	⁎	⁎	⁎		⁎	⁎	⁎	8

ISSN: 1471-230X