Table 4.

Subgroup analysis for patency with multivariable regressions

Subgroup	N modelled	Adjusted* OR (95% c.i.) for regional versus general	P
Neuraxial anaesthesia with/without general† versus general anaesthesia only	7638	1.08 (0.79–1.48)	0.638
Neuraxial only versus general only	7546	1.25 (0.88–1.80)	0.218
Spinal only versus general only	7481	1.25 (0.85–1.83)	0.251
Femoral bypass	2179	1.50 (0.84–2.67)	0.172
Femoropopliteal bypass	4803	0.92 (0.60–1.41)	0.692
Popliteal bypass	616	2.35 (0.54–10.31)	0.258
Previous bypass‡	2792	0.96 (0.54–1.72)	0.889

^*Covariates adjusted for were age, bleeding disorder, severe chronic obstructive pulmonary disease, smoking status, renal failure, functional status, diabetes, total operating time, year of surgery, high-risk physiological and anatomical risk factors as defined by National Surgical Quality Improvement Program, and procedure type. †Includes patients receiving only neuraxial or both general and neuraxial anaesthesia. ‡Defined as previous ipsilateral bypass or percutaneous intervention involving currently treated segment in National Surgical Quality Improvement Program. Values are n (%) unless stated otherwise.