Figure 2From: Profiling quality of care for patients with chronic headache in three different German hospitals – a case studyProfile of outcome quality consisting of four outcome measures at discharge from hospital (above) and 6 months after (below); the graph represents mean z-scores (with 95% confidence interval) adjusted for covariates, values right of the vertical zero line mean better results compared to the grand mean of all three hospitals (• hospital A, ° hospital B, * hospital C).Back to article page