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Figure 3 | BMC Health Services Research

Figure 3

From: Variations and inter-relationship in outcome from emergency admissions in England: a retrospective analysis of Hospital Episode Statistics from 2005–2010

Figure 3

Example of a funnel plot visually exploring the issue of variability in all-cause 28-day emergency readmission rate for pneumonia (LRTI) between providers. 22.3% of hospitals lay outside the 95% (green lines) confidence intervals (green) and 8.9% of hospitals lay outside the 99.8% (red lines) confidence intervals. Further statistical analysis determined whether the probability that the number of hospitals outside the confidence intervals was significant (both p < 0.0001).

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