Figure 1From: How does lean work in emergency care? A case study of a lean-inspired intervention at the Astrid Lindgren Children's hospital, Stockholm, Sweden P-control chart for percentage of patients leaving the A&E within four hours. Special-cause variation is identified based on the decision rule: Nine consecutive points fall on the same side of the pre-lean baseline. The percentage of patients who leave the A&E within four hours pre-lean differs slightly from the value identified by the ANOVA as truncated values were used for the P-chart.Back to article page