Table 5:

Propensity score-weighted, Imputed Hazard Ratios for 90 day Mortality

Hospital Surgeon Average Annual Volume Groups	Propensity Score Weighted, Imputed Hazard Ratios, 95% Confidence Intervals
Reference Group Hospital Volume >=30, Surgeon volume >=30
Hospital volume >=30
Surgeon Volume < 10	1.13 (1.00–1.29)
Surgeon Volume 10–19	1.21 (1.07–1.37)
Surgeon Volume 20–29	1.08( 0.85–1.37)
Hospital Volume 10–29
Surgeon Volume < 5	1.42 (1.28–1.58)
Surgeon Volume 5–9	1.39 (1.23–1.57)
Surgeon Volume >=10	1.69 (1.46–1.95)
Hospital Volume < 10
Surgeon Volume < 2	1.64 (1.48–1.81)
Surgeon Volume 2–4	1.73 (1.55–1.94)
Surgeon Volume >=5	1.51 (1.27–1.79)