Table 3. Regression coefficients for the effect of BMI on surgery time.

^†p < 0.1

*p < 0.05

**p < 0.001

BMI: Body mass index; MIS-TLIF: Minimally invasive transforaminal lumbar interbody fusion; OLLIF: Oblique lateral lumbar interbody fusion; SD: Standard deviation; TLIF: Transforaminal lumbar interbody fusion.

Dependent Variable: Surgery Time (min)	OLLIF	MIS-TLIF	TLIF
BMI	0.556	2.827†	1.711**
	(0.467)	(1.426)	(0.427)
F-Statistic	14.708** (df = 4; 63)	1.680 (df = 4; 22)	37.780** (df = 4; 220)
R2	0.483	0.234	0.407