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Table 2 Newcastle-Ottawa scale for quality assessment

From: Prognostic and clinicopathological value of Beclin-1 expression in hepatocellular carcinoma: a meta-analysis

Study Selection Comparability Outcome Total
Exposed cohort Non-exposed cohort Ascertainment of exposure Outcome of interest Control for factor Assessment of outcome Follow-up long enough Adequacy of follow-up score
Ding [15] * * * * ** * * * 9
Kang [21] * * * * * * * * 8
Lee [22] * * * * ** * *   8
Guo [26] * * * * ** * * * 9
Qiu [14] * * * * ** * * * 9
Wu [16] * * * * ** * * * 9
Osman [23] * * * * * * * * 8
Yang [27] * * * * ** * * * 9
Al-Shenawy [24] * * * * ** * * * 9
Zhou [25] * *   * * * *   6
  1. *A study can be awarded a maximum of one star for each numbered item within the selection and outcome categories. A maximum of two stars can be given for comparability. http://www.ohri.ca/programs/clinical_epidemiology/oxford.asp