Table 1.

Quantitative summary of the correlation between postoperative ODI and each of the considered predictor variables

	R2	Adjusted R2	p value
Preoperative ODI	0.401	0.368	0.003*
Preoperative mJOA	0.041	−0.012	0.391
Age	0.102	0.052	0.171
Narrowest Diameter	0.012	−0.043	0.643
MAA sine	7.77 × 10−5	−0.056	0.971
MAA sine (without outliers)	0.197	0.150	0.057*
MAA step	0.0025	−0.053	0.836
MAA step (without outliers)	0.205	0.155	0.060*
Symptom duration (all data)	0.405	−0.040	0.614
Symptom duration (< 60 months)	0.401	0.368	0.003*

^*p value at or close to significance (p < 0.05 deemed significant).

MAA = mean absolute accuracy, mJOA = modified Japanese Orthopedic Association scale, ODI = Oswestry disability index, sine = sinusoidal.