Table 2 Newcastle-Ottawa Scale (NOS) score of included articles
Number | Author | Year | Selection | Comparability | Exposure | Total | Average | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Adequate definition | Representativeness | Selection of Controls | Definition of Controls | Ascertainment of exposure | Same method | Non-Response rate | ||||||
1 | Gao et al. [28] | 2019 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | 5.85 |
2 | Hong et al. [29] | 2017 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
3 | Lee et al. [30] | 2016 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
4 | Loeffelholz et al. [31] | 2017 | 1 | 0 | 1 | 1 | 0 | 1 | 1 | 0 | 5 | |
5 | Long et al. [32] | 2019 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
6 | Yang et al. [33] | 2017 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
7 | Zhang et al. [34] | 2019 | 1 | 1 | 1 | 1 | 0 | 0 | 1 | 0 | 5 | |
8 | Zhang et al. [35] | 2021 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
9 | Zhu et al. [36] | 2016 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
10 | Altun et al. [37] | 2018 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
11 | Yang et al. [38] | 2020 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
12 | Ma et al. [39] | 2019 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |
13 | Yilmaz et al. [40] | 2009 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 0 | 6 | |