Fig. 3

Funnel plots-control of blood pressure. Funnel plots of the centre specific scores for the threshold measure and the clinical action measure for the control of blood pressure. Each circle represents a centre. Centres were given an anonymous rank number. Only centres with five or more diabetes patients were included. The red line represents the overall mean proportion of patients meeting the measure. Centres with a score more than two standard deviations from the overall mean proportion (black dashed line) are marked in blue, centres with a score more than three standard deviations from the overall mean proportion (black solid line) are marked in red