Table 5.

Assessment schedule.

Variable	Measure	Pre-operative	Post-operative
			3 mos	6 mos		12 mos	24 mos
Intermediary outcomes
Patient activationa	Patient Activation Measure	x	x
Self-efficacya	Modified Self Efficacy Scale	x	x
Primary outcomes
Physical therapy attendancea	Attendance (number of sessions attended/sessions prescribed)			x
Physical therapy engagementb	Hopkins Rehabilitation Engagement Rating Scale			x
Home exercise attendancea	Attendance (number of sessions attended/sessions prescribed)			x
Secondary outcomes
Pain intensitya	Numeric Rating Scale	x	x	x	x		x
Health statusa	Short Form 12, version 2	x	x	x	x		x
Disabilitya	Oswestry Disability Index	x	x	x	x		x
Correlates
Socio-demographic factorsa	Age, gender, race/ethnicity, primary language, marital status, household size	x
Co-morbiditiesa	Elixhauser Comorbidity Measure	x
Depressive symptomsa	Patient Health Questionnaire-9	x
Education/economic resourcesa	Education, household income	x
Health habitsa	Smoking (frequency/amount), obesity (height and weight)	x

^aData provided through patient self-report.

^bData provided through physical therapist report.