Table A3 Quality assessment of included studies on dietary pattern and risk of oesophageal squamous cell carcinoma

From: Dietary patterns and oesophageal squamous cell carcinoma: a systematic review and meta-analysis

Articles, Year

Selection

Comparability

Exposure

Overall

Grade

Ibiebele et al, 2012

4

2

1

7

High

Bahmanyar and Ye, 2006

4

2

2

8

High

De Stefani et al, 2008a

3

2

3

8

High

De Stefani et al, 2008b

3

2

3

8

High

Hajizadeh et al, 2010

3

2

2

7

High

Hajizadeh et al, 2012

3

2

2

7

High

Bravi et al, 2012b

3

2

3

8

High

Navarro Silvera et al, 2011

3

2

2

7

High

De Stefani et al, 2009

3

2

3

8

High

  1. (i) The study quality was assessed according to the Newcastle Ottawa Quality assessment scale for case–control studies. (ii) The scale awards a maximum of 9 points to each study: 4 for selection, 2 for comparability, and 3 for assessment of exposures. (iii) Comparability was assessed based on the adjustment of age, sex, body mass index, smoking status, and education. (iv) Response-rate difference less than 10% was considered as same response rate for both groups. (v) Grade was classified as low (overall quality score ranged from 1 to 3), median (4–6), and high (7–9).
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