Usefulness of the Core Outcome Measures Index in Daily Clinical Practice for Assessing Patients with Degenerative Lumbar Disease

Table 3

Internal Consistency (cronbach’s alpha coefficient).

	α
	Preoperative	Postoperative
ODI	0.854	0.915
COMI (Total)	0.807	0.910
Pain	0.446	0.776
Function	—	—
Well-being	—	—
Disability	0.911	0.749
Satisfaction	0.827	0.858
SF-36v2
PF	0.888	0.938
GH	0.750	0.839
RP	0.889	0.938
RE	0.879	0.932
SF	0.662	0.856
BP	0.768	0.887
VT	0.828	0.811
MH	0.862	0.763

α > 0.7-0.8 (max value = 1) → good reliability.