Table 6.

Multiple Variable Selection by Stepwise Regression Modeling.

Model	R 2	Adjusted R 2	Variable Names
1	0.685	0.678	Pre ODI
2	0.756	0.744	Pre ODI, Buck’s
3	0.815	0.801	Pre ODI, Buck’s, Preop SF-36pcs
4	0.846	0.830	Pre ODI, Buck’s, Preop SF-36pcs, Professional
6	0.913	0.809	Pre ODI, preop SF36pcs, Buck’s, professional, multiple opns, L3 pars defect

Abbreviations: ODI, Oswestry Disability Index; preop, preoperative; SF-36, 36-item Short Form health questionnaire; pcs, physical component summary; opns, operations.