Table2 NOS quality assessment for the included studies.
Methodological item for non-randomized studies (No. 1–8) | Goker et al.16 | Çömez et al.17 | Türkcü et al.18 | Karalezli et al.19 | Emre et al.20 | Accorinti et al.28 | Koca et al.29 | Aksoy et al.30 | Eser-Ozturk et al.31 | Smid et al.32 | Cheng et al.33 | Yilmaz et al.34 | Pei et al.35 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1. Is the Case Definition Adequate? | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
2. Representativeness of the Cases | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
3. Selection of Controls | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
4. Definition of Controls | 1 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 1 |
5. Comparability of Cases and Controls on the Basis of the Design or Analysis | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
6. Ascertainment of Exposure | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 0 | 0 | 1 |
7. Same method of ascertainment for cases and controls | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
8. Non-Response Rate | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Total score | 7 | 5 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 6 | 5 | 7 |
