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Table 3 Assessment of study quality included in the meta-analysis by Newcastle Ottawa Scale (NOS) for case-control studies

From: Association between whole grain intake and breast cancer risk: a systematic review and meta-analysis of observational studies

Source Selection Comparabilitya Exposure Total scores
1 2 3 4 5A 5B 6 7 8  
Mourouti et al. * * * * * * * * 8
Tajaddini et al. * * * * * * * 7
Yun et al * * * * * * 6
Adzersen et al. * * * * * * 6
Chatenoud et al. * * * * * * * 7
Levi et al. * * * * * * * 7
LaVecchia et al * * * * * * * * 8
  1. 1 Is the case definition adequate? 2 Representativeness of the cases. 3 Selection of controls. 4 Definition of controls. 5 Comparability of cases and controls on the basis of the design or analysis. 6 Ascertainment of exposure. 7 Same method of ascertainment for cases and controls. 8 Non-response rate
  2. aStudies that controlled for age and traditional risk factors received one score, whereas studies that controlled for other important confounders received an additional score