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Table 2 The quality assessment according to the Newcastle–Ottawa quality assessment scale (NOS) of each study

From: The effectiveness of TDF versus ETV on incidence of HCC in CHB patients: a meta analysis

  References Koklu,(2013) [14] Goyal(2015) [15] Choi(2017) [16] Tsai(2017) [17] Kim,B.G(2018) [19] Kim,Y.M(2018) [18] Yu(2018) [20]
Selection Reprensentativeness of the exposed cohort 1 1 unclear 1 1 1 1
Selection of the non-exposed cohort 1 1 unclear 1 1 1 1
Ascertainment of exposure 1 1 1 1 1 1 1
Demonstration that outcome of interest was not present at the start of study 1 unclear 1 1 1
Comparibility Study controls for age or gender 1 1 1 1 1
Study controls for any additional factor 1 1 1 1 1 1 1
Outcome Assessment of outcome 1 1 unclear 1 1 1 1
Follow-up long enough for outcomes to occur 1 1 1 1
Adequacy of follow-up of cohort 1 1 unclear 1 1 1 1
  Total 7 9 unclear 7 9 8 8