Figure 1

Relationship between baseline and change in incidence (y axis) for all outcomes during the study period*.* 95%CI band of the predicted curve as well as the original data points presented; the sizes of the scatter points in each graph were drawn proportional to the volume of admissions during the study period; baseline incidence and change in incidence are presented as events per 1000 admissions; for only primary outcome and unexpected death in control hospitals, the figures suggest a quadratic relationship.