Table 2 Quality assessment of non-randomized controlled trials (Newcastle–Ottawa scale for non-randomized controlled trials)
Study ID | Selection | Comparability | Exposure or Outcome | Total score |
|---|---|---|---|---|
Ge 2016[24] | ★★★ | ★★ | 5 | |
Duan 2019[25] | ★★ | ★★ | ★★ | 6 |
Cao 2017[22] | ★★★ | ★★ | 5 | |
Huang 2017[21] | ★★★★ | ★★ | 6 | |
Tong 2016[23] | ★★★ | ★★ | 5 | |
Liebergall. M 2006[26] | ★★★ | ★★ | 5 | |
He 2019[10] | ★★★ | ★ | ★★ | 6 |
Wang 2019[4] | ★★★ | ★ | ★★ | 6 |
Wen 2015[28] | ★★★ | ★ | ★★ | 6 |
Wu 2015[33] | ★★★ | ★ | ★★ | 6 |
Yin 2020[29] | ★★★ | ★ | ★★★ | 7 |
Liu 2014[31] | ★★★ | ★ | ★★★ | 7 |
Liu J 2015[32] | ★★★ | ★ | ★★ | 6 |