Table 2.

Patient and Cost Characteristics of Outlier and Nonoutlier Surgeons Performing THA in a Single Practice.

Characteristic	Outlier (n = 3)	Nonoutlier (n = 17)	P Value
Age	65	66	.21
BMI	29.2	29.5	.36
ASA	2.32	2.40	.08
A-CCI	4.29	4.37	.07
PT visits	0.01	0.28	<.001
X-ray visits	0.94	1.15	<.001
Self-pay amount	$116.10	$177.40	<.001
Hospital (inpatient) (%)	85.6	78.1	-
Surgical center (outpatient) (%)	14.4	21.9	-

TKA, total knee arthroplasty; BMI, body mass index; ASA, American Society of Anesthesiology Score; Age-Adjusted CCI, age-adjusted charlson comorbidity index.