Table 4: Pearson product-moment correlation of patient outcome scores at referral and immediately preoperatively with wait time for surgery

Outcome measure	Time point; r
Outcome measure	Referral	Immediately preoperatively
SF-36 PC score	-0.021	-0.05
SF-36 MC score	0.233†	0.192*
ODI score	-0.197*	0.223†
ZCQ score	-0.050	0.16*
Back pain score	-0.143	0.130
Leg pain score	-0.180*	0.207*

Note: MC = mental component, ODI = Oswestry Disability Index, PC = physical component, SF-36 = 36-item Short-Form Health Survey, ZCQ = symptom severity scale of the Zurich Claudication Questionnaire.

*p < 0.05.

†p < 0.01.