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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Am J Surg. 2014 Oct 13;209(6):977–984. doi: 10.1016/j.amjsurg.2014.06.037

Table I. Patient risk level and complexity of the operation by usefulness rating.

Usefulness Response N Mean Surgeon Risk Estimate Mean Model Risk Estimate Mean Work RVU
Mortality Morbidity Mortality Morbidity
Not Useful (1, 2) 285 0.51% 8.29% 0.54% 9.63% 17.77
Neutral (3) 468 0.44% 4.77% 0.29% 5.70% 13.74
Useful (4, 5) 249 0.79% 8.72% 0.68% 10.69% 18.24
Difference 1-2 vs. 3 0.1904 <.0001 0.0015 <.0001 <.0001
Difference 3 vs. 4-5 <.0001 <.0001 <.0001 <.0001 <.0001
Difference 1-2 vs. 4-5 0.0007 0.6099 0.2355 0.2553 0.6895

Note. Usefulness response options: 1 = Not Useful, 2 = Moderately Un-useful, 3 = Neutral, 4 = Moderately Useful, 5 = Very Useful. Independent samples t-tests were used to compare mean differences across usefulness ratings on patient risk level and complexity of the operation.