Table 5.

Internal consistency of the SPADI scale.

	Cronbach's alpha	SEM	MDC
Pain subscale (5 Items)	0.94	2.62	3.70
Disability subscale (8 items)	0.76	8.96	12.58
Total scale (13 items)	0.84	10.82	15.30

MDC: minimally detectable change; SEM: standard error measurement.