Table 4. Multivariable analysis of factors associated with the use of in-situ release for treatment of cubital tunnel syndrome (2010-2012).

Patient and surgeon characteristics	Adjusted Odds Ratio ¥	P value
Sex
Female	1	-
Male	0.81 (0.70-0.93)	0.004
Patient location
Large metro	1	-
Small metro	1.18 (0.69-2.01)	0.55
Micro	1.06 (0.65-1.74)	0.80
Other	1.12 (0.63-2.00)	0.70
Primary Payer
Medicare	1	-
Medicaid	1.06 (0.90-1.24)	0.50
Private	0.65 (0.45-0.93)	0.02
Other	0.93 (0.74-1.18)	0.55
No. of procedure types performed by the surgeon between 2010 and 2012
One type	1
Two types	0.13 (0.09-0.19)	<.0001
Three types	0.07 (0.04-0.14)	<.0001
Surgeon case volume between 2010 and 2012†
Quartile 1 (1-21 case)	1
Quartile 2 (22-61 cases)	3.62 (2.25-5.82)	<.0001
Quartile 3 (62-195 cases)	20.83 (9.9-43.83)	<.0001
Quartile 4 (195-572 cases)	59.81 (16.37-218.56)	<.0001

Large metro, 1 million residents or more; small metro, less than 1 million residents; micro, adjacent to large or small metro; Other, not metro or micro

^¥Adjusted odds ratios of undergoing in-situ release were calculated in hierarchical logistic models with a random effect of surgeons who treated the patient cohort, simultaneously adjusting for all patient factors.