Fig. 2

Forest plots reporting random center effect (odds ratios and 95% confidence intervals) on inverse of modified Rankin Scale at 90 days in four models using random effect proportional odds regression analysis. a: Model 1 (unadjusted model); b: Model 2 (case-mix adjusted model); c: Model 3 (case-mix and structure indicators adjusted model); d: Model 4 (case-mix, structure and process indicators adjusted model)