Table 3 Measures of model fit for models including both RCT and non-randomised studies. Model A: naïve pooling, Model B1: two-level hierarchical model (treatment vs class), Model B2: two-level hierarchical model (treatment vs design), Model B3: three-level hierarchical model, Model C1: bias adjustment assuming same bias by class, Model C2: bias adjustment allowing for bias to vary by class

From: Hierarchical network meta-analysis models for synthesis of evidence from randomised and non-randomised studies