Table 3.

Average ratio of actual-to-expected LOS and total costs by APR-DRG group for groups with N > 10.

		Not offered		Offered		P value
Diagnosis grouping (APR-DRGs)	N*	LOS mean (SD)	Total costs mean (SD)	LOS mean (SD)	Total costs mean (SD)	LOS	costs
All participants	336	0.94 (0.4)	0.95 (0.5)	1.04 (0.5)	1.00 (0.5)	.108	.308
Pulmonary (121–143)	25	0.90 (0.7)	0.77 (0.5)	1.16 (0.6)	1.30 (0.8)	.123	.391
Pneumonia (139)	11	1.41 (0.7)	1.11 (0.6)	1.21 (0.7)	1.51 (0.9)	.702	.504
Cardiovascular (161–207)	111	1.00 (0.5)	0.95 (0.3)	1.16 (0.6)	1.07 (0.4)	.170	.147
Bypass (165–166)	12	1.09 (0.3)	0.85 (0.1)	0.93 (0.2)	0.95 (0.2)	.341	.512
PCI w/AMI (174)	32	1.06 (0.4)	1.00 (0.2)	1.04 (0.5)	1.01 (0.3)	.876	.927
Heart failure (194)	17	0.84 (0.3)	0.80 (0.2)	1.38 (0.6)	1.49 (0.7)	.049	.021
Gastrointestinal (221–284)	32	0.79 (0.3)	0.91 (0.6)	0.98 (0.5)	0.89 (0.4)	.266	.901
Musculoskeletal (300–347)	120	0.94 (0.4)	0.89 (0.2)	0.93 (0.4)	0.91 (0.3)	.868	.773
Hip/knee (302)	73	1.01 (0.3)	0.96 (0.2)	0.97 (0.4)	1.00 (0.2)	.636	.439
Total knee (8154†)	45	1.01 (0.4)	0.98 (0.2)	1.01 (0.5)	0.95 (0.2)	.993	.612
Total hip (8151†)	21	1.03 (0.3)	1.00 (0.1)	0.96 (0.3)	1.10 (0.2)	.659	.350
Back fusion (304)	11	0.81 (0.2)	0.76 (0.2)	0.75 (0.2)	0.72 (0.2)	.476	.476
Intervertebral disc (310)	21	0.67 (0.1)	0.70 (0.1)	0.96 (0.5)	0.79 (0.3)	.040	.362
Uterine procedures (513)	14	0.82 (0.2)	0.85 (0.1)	0.98 (0.2)	0.95 (0.2)	.373	.373

*N may differ from that shown in Table 2 since estimates of expected LOS and costs were not available for all participants.

COPD: chronic obstructive pulmonary disease; PCI: percutaneous coronary interventions; AMI: acute myocardial infarction.