Efficacy of PD-1/PD-L1 Inhibitors versus Chemotherapy in Lung Cancer with Brain Metastases: A Systematic Review and Meta-Analysis

Figure 2

Assessment of risk of bias. (a) Methodological quality graph: authors’ judgment about each methodological quality item presented as percentages across all included studies. (b) Methodological quality summary: authors’ judgment about each methodological quality item for each included study, “+” low risk of bias; “?” unclear risk of bias; “-” high risk of bias.

(a)

(b)