TABLE 3.

Goodness-of-fit indexes for confirmatory factor analyses of two alternative models of the Pain Disability Index

Model	χ2	df	CFI	NNFI	RMSEA (90% CL)
Model 1	48.0	14	0.918	0.877	0.118 (0.082–0.155)
Model 2	29.9	13	0.959	0.934	0.086 (0.045–0.127)

Model 1 is the one-factor model of reference 24. Model 2 is the two-factor model of reference 23. CFI Comparative fit index; CL Confidence level; df Degrees of freedom; NNFI Non-normative fit index; RMSEA Root mean square error of approximation