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. 2014 Feb 18;9(2):e88737. doi: 10.1371/journal.pone.0088737

Figure 1. Observed/Expected (O/E) mortality ratio of all hospitals in the Dutch Surgical Colorectal Audit in 2010 and 2011.

Figure 1

Measure of ‘Outcome only’: requires that a hospital's O/E ratio, regardless of its confidence interval, is below or equal to 2 (red fat printed line), met the ‘outcome only’ criterion. Measure of ‘Volume only’: requires that a hospital meets the ‘volume only’ criterion of >50 procedures per year (red squares) Combined measure of ‘volume and outcome (CM-V&O)’: the lower limit of the confidence interval around the hospitals O/E ratio is below or equal to 1, i.e. that the hospital is not significantly worse than average. In addition CM-V&O requires that the higher limit of the confidence interval is below 2 (fat printed red line), i.e. that the hospital is significantly better than substandard.