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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
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Nutrition Journal

ISSN: 1475-2891

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