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Table 3 Results from the random effect proportional odds regression analysis using the inverse of the modified Rankin Scale at 90 days as the dependent variable

From: Improving quality of stroke care through benchmarking center performance: why focusing on outcomes is not enough

  Model 1 Model 2 Model 3 Model 4
Center volume [OR (95% CI)] 1.01 (0.98–1.04) 1.01 (0.98–1.05)
Year of admission [OR (95% CI)]   
 2014    ref ref
 2015    1.32 (0.95–1.85) 1.20 (0.86–1.67)
 2016    1.67 (1.22–2.28) 1.36 (0.98–1.90)
 2017    1.60 (1.17–2.19) 1.27 (0.91–1.77)
Time from arrival at the ED of intervention center to groin puncture (every 30 min) [OR (95% CI)] 0.87 (0.82–0.92)
Use of general anesthesia [OR (95% CI)] 0.72 (0.57–0.90)
Variance of random center intercept [tau2(95% CI)]# 0.040 (0.012–0.113) 0.086 (0.042–0.261) 0.081 (0.028–0.227) 0.089 (0.033–0.254)
AIC 11,158 10,050 10,043 10,012
  1. ED Emergency department, AIC Akaike’s Information Criterion. A lower AIC value indicates a better model fit
  2. Model 1 (‘unadjusted model’) includes a random center intercept only
  3. Model 2 (‘case-mix adjusted model’) includes a random center intercept and the case-mix indicators (Table 1). See Supplementary Figure 3 for the estimated fixed effects of each case-mix indicator
  4. Model 3 (‘case-mix and structure indicators adjusted model’) includes a random center intercept, case-mix indicators, and structure indicators
  5. Model 4 (‘case-mix, structure and process indicators adjusted model’) includes a random center intercept, case-mix indicators, structure indicators, and process indicators
  6. #95% CIs around τau2 were estimated using single imputed data with bootstrap