Figure 1
From: Funnel plots, performance variation and the Myocardial Infarction National Audit Project 2003–2004
Funnel plot for percentage of patients thrombolysed within 30 minutes of arriving in hospital (DTN 30). Data abstracted from the MINAP Third Public Report.[11] DTN = door to needle time, LCL = lower control limit, UCL = upper control limit, target = National Service Framework for coronary heart disease goal of 75%. Funnel plot with control limits for both mean performance and target performance. In this case the number of hospitals identified is similar.