Table 2 Quality assessment of included studies
From: Potential prognostic value of delta-like protein 3 in small cell lung cancer: a meta-analysis
Study | Study participation | Study attrition | Prognostic factor measurement | Outcome measurement | Study confounding | Statistical analysis and reporting | Total risk of bias |
|---|---|---|---|---|---|---|---|
Yan et al. [20] | ○ | ● | ○ | ○ | ○ | ○ | Low |
Xie et al. [21] | | ● | ○ | ○ | | ○ | Moderate |
Tanaka et al. [22] | ○ | ● | ○ | ○ | ○ | ○ | Low |
Regzedmaa et al. [23] | ○ | ● | ○ | ○ | ○ | ○ | Low |
Huang et al. [24] | ○ | ● | ○ | | ● | ○ | High |
Furuta et al. [25] | | ● | ○ | ○ | | ○ | Moderate |
- “◎” indicates low risk of bias, “
” moderate risk of bias and “●” high risk of bias
” moderate risk of bias and “