Table 3.

Operative Mortality, by Procedure Type: Propensity Score Analysis

Procedure	Nursing Home Resident	Non-institutionalized elderly Medicare enrollees
Surgery for bleeding ulcer
Total number of patients	2337	2337
Operative mortality % (n)	41.6% (972)	29.8% (696)
Cholecystectomy
Total number of patients	41405	41405
Operative mortality % (n)	11.0% (4544)	4.7% (1963)
Appendectomy
Total number of patients	2099	2099
Operative mortality % (n)	11.4% (240)	4.5% (94)
Colectomy
Total number of patients	24851	24851
Operative mortality % (n)	31.5% (7835)	18.3% (4552)