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 |