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