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

From: Metabolic syndrome and the incidence of lung cancer: a meta-analysis of cohort studies

Study Representativeness of the exposed cohort Selection of the non-exposed 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 cohorts Total
Russo 2008 1 0 1 1 1 0 1 1 1 7
Inoue 2009 1 1 1 1 1 1 1 1 1 9
Osaki 2012 1 1 1 1 1 1 1 1 1 9
Kruijsdijk 2013 1 0 1 1 1 1 1 1 1 8
Ko 2016 1 1 1 1 1 1 1 1 1 9
  1. NOS Newcastle–Ottawa Scale