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Table 2 Risk of bias for each study based on QUIPS quality assessment

From: Adiponectin is associated with poor prognosis in carcinoma patients: evidence from a meta-analysis

Study Study partici-pation Study attrition Prognostic factor measurement Outcome measure-ment Confounding measurement and account Analysis approaches Overall appraisal of potential bias
Wang 2014 [6] Yes Yes Yes Partly Yes Yes Moderate
Siegel 2014 [7] Yes Yes Yes Yes Yes Yes Low
Cubukcu 2014 [10] Yes Yes Yes Yes Yes Yes Low
Canhoroz 2014 [24] Yes Yes Yes Yes Yes Yes Low
Lee 2014 [9] Yes Yes Yes Yes Yes Yes Low
Shin 2014 [8] Yes Yes Yes Yes Yes Yes Low
Kerenidi 2013 [11] Yes Yes Yes Partly No Yes High
Tsukada 2011 [12] Yes Yes Yes Partly Yes Yes Moderate
Petridou 2009 [13] Yes Yes Yes Yes Yes Yes Low
Ferroni 2007 [25] Yes Yes Yes Yes No Yes High
  1. QUIPS = Quality in Prognosis Studies
  2. Yes = a low risk of bias; Partly = moderate risk of bias; No = high risk of bias