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. Author manuscript; available in PMC: 2016 Jan 1.
Published in final edited form as: Ann Surg. 2015 Jan;261(1):2–8. doi: 10.1097/SLA.0000000000000765

Table 3.

Multivariate Analysis of Patient Satisfaction and Standardized Composite Measure of Surgical Quality

Bivariate
Composite
Standardized
Surgical
Quality Score		 P-Value Model I
Multivariate
Composite
Standardized
Surgical
Quality Score		 P-Value Model 2
Multivariate
Composite
Standardized
Surgical
Quality Score		 P-Value
Patient Satisfaction
  Lowest Quartile 0.226 <0.001 0.113 <0.001 −0.010 <0.001
  2nd Quartile 0.019 0.006 −0.079
  3rd Quartile −0.078 −0.040 −0.105
  Highest Quartile −0.182 −0.088 −0.145

The dependent variable reflects a composite standardized surgical quality with equal weights for z-scores from the SCIP surgical score, risk-adjusted readmissions, risk-adjusted mortality, and risk-adjusted length of stay measures. SCIP z-scores were inverted to match the directionality of the other measures; therefore, more negative z-scores represent higher surgical quality. All models adjust for bed size, profit status, teaching status, region, rural location, and percent surgical discharges. Model 1 represents unweighted results, while Model 2 represents results weighted by hospital composite surgical procedure volume.