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. Author manuscript; available in PMC: 2016 Oct 7.
Published in final edited form as: Ann Thorac Surg. 2015 Jan 9;99(3):856–862. doi: 10.1016/j.athoracsur.2014.09.048

Table 3.

O/E Mortality Ratios Among Sites Grouped by Center Rate of High-Risk Patients

Mortality (%)
Center-Level Predicted Risk N (Centers) N (Patients) Observed Expected O/E (95% CI)
Q1 (lowest) 200 91,964 1.55 1.51 1.03 (0.97–1.08)
Q2 201 114,605 1.71 1.75 0.98 (0.93–1.02)
Q3 200 106,038 1.93 1.97 0.98 (0.94–1.03)
Q4 201 106,768 2.08 2.21 0.94 (0.90–0.98)
Q5 (highest) 200 75,580 2.40 2.85 0.84 (0.80–0.88)

High-risk refers to those patients with predicted risk of mortality greater than 10%.

CI = confidence interval; O/E = observed/expected ratio.