Table 2. MRI measurements of the lateral recess and foramina located on the concave side of the curves. *All readings in cm2.

Reading (n)	PREOP mean CI)	POSTOP mean (CI)	t-TEST	Effect Size (r)	P VALUE
Lateral Recess areas (14)	0.21	0.4	t (14) = -.46	r =0.65	< 0.001
Foramina (14)	0.46	0.41	t (14) = -6.2	r = 0.75	< 0.001