Table 3. Quality assessment of eligible studies (Newcastle-Ottawa scale).
| Study | Selection | Comparability | Outcome | Total | |||||
|---|---|---|---|---|---|---|---|---|---|
| Adequacy of case definition | Number of cases | Representativeness of the cases | Ascertainment of exposure | Ascertainment of detection method | Ascertainment of cut-off | Assessment of outcome | Adequate follow up | ||
| Okita 2016 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Tsukagoshi 2016 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Zhao 2016 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Chen 2016 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Koguchi 2015 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Wang 2015 | 0 | 1 | 1 | 1 | 1 | 0 | 1 | 1 | 6 |
| Cho 2014 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Fang 2014 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
| Zhang 2014 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Chen 2013 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Li 2013 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Wu 2013 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
| Kumar 2012 | 1 | 1 | 1 | 0 | 1 | 1 | 1 | 1 | 7 |
| Duan 2011 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 6 |
| Tamaki 2010 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
| Paschen 2009 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |
| Tamaki 2008 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
| Li 2008 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 7 |
| Rebmann 2007 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 8 |