Table 1.
Newcastle-Ottawa Quality Assessment Scale of case control studies.
| Study | Selection | Comparability | Outcome | Quality | |||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 1 | 1 | 2 | 3 | Score | |
| Bulut et al. (2018) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| Lahme et al. (2018) | 1 | 1 | 0 | 0 | 2 | 1 | 1 | 0 | 6 |
| O'Bryhim et al. (2018) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| Jiang et al. (2018b) | 1 | 1 | 1 | 1 | 2 | 1 | 1 | 0 | 8 |
| Querques et al. (2019) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| Haan et al. (2019) | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 |
| Zhang et al. (2019) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| Zabel et al. (2019) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| Yoon et al. (2019) | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 |
| Wu et al. (2020) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| Chua et al. (2020) | 1 | 1 | 0 | 0 | 2 | 1 | 1 | 0 | 6 |
| Robbins et al. (2021) | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 |
| Salobrar-Garcia et al. (2020) | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 0 | 6 |
| Criscuolo et al. (2020) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| van de Kreeke et al. (2020) | 1 | 1 | 0 | 0 | 1 | 1 | 1 | 0 | 5 |
| Wang et al. (2021) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| Shin et al. (2021) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
| O'Bryhim et al. (2021) | 1 | 1 | 0 | 1 | 2 | 1 | 1 | 0 | 7 |
Criteria for quality assessment:
Selection: (1) Is the case definition adequate? (2) Representativeness of the case (3) Selection of controls (4) Definition of Controls.
Comparability: (1) Comparability of case controls on the basis of the design or analysis.
Outcome: (1) Ascertainment of exposure (2) Same method of ascertainment for cases and controls (3) Non-Response rate.