Table 2.

Relative Risk Scores for Patients Undergoing Outpatient Procedures by Facility Type (1997–2004)

	Risk Scores Adjusted for Primary Diagnoses Only			Risk Scores Adjusted for Primary and All Secondary Diagnoses			Percent Patients with Reported Secondary Diagnoses
Procedure	ASC	HOPD	p-Value*	ASC	HOPD	p-Value*	ASC	HOPD
1. Colonoscopy	0.83	0.82	<.0001	0.66	0.84	<.0001	44.78	88.15
2. Cataract	1.20	1.18	<.0001	1.00	1.39	<.0001	8.68	59.87
3. Upper gastrointestinal endoscopy	0.92	0.90	<.0001	0.82	1.05	<.0001	47.13	89.05
4. Debridement of skin and other tissues	1.51	2.89	<.0001	1.74	4.45	<.0001	30.20	65.81
5. Arthroscopy	0.62	0.61	<.0001	0.52	0.69	<.0001	61.07	85.54
6. Repair of inguinal hernia	0.71	0.70	.0409	0.47	0.68	<.0001	15.28	52.27
7. Central venous catheterization	4.39	5.08	<.0001	5.50	7.02	<.0001	35.82	65.63
8. Laparoscopic cholecystectomy	0.48	0.55	<.0001	0.31	0.57	<.0001	30.22	59.85
9. Biopsy of liver	0.85	2.28	<.0001	0.77	2.91	<.0001	31.70	51.60
10. Laparoscopic occlusion & fulguration of oviducts	0.19	0.19	.8270	0.01	0.10	<.0001	32.36	47.54
11. Biopsy of prostate	1.13	1.24	<.0001	0.98	1.21	<.0001	28.70	62.67
12. Spinal injection for myelography and/or computed tomography	1.29	1.26	.0725	1.22	1.19	.0928	55.33	65.54
13. Overall average for 12 procedures	1.18	1.47		1.17	1.84		35.11	66.13

Note:

^*t-tests compare means of relative risk scores for ASC and HOPD.