Psychometric evaluation of the canine brief pain inventory in a Swedish sample of dogs with pain related to osteoarthritis

Table 3 Fit indices for the confirmatory factor models by maximum likelihood estimation method in all dogs with pain associated with osteoarthritis (n = 58) and dogs with osteoarthritis pain and CBPI ≥1 (n = 49)

Model	Chi²	Df	Chi²/df	CFI	NFI	PNFI	RMSEA	90% CI
1-factor (all OA)	156.81	36	4.36	0.775	0.730	0.584	0.243	0.204–0.282
1-factor(OA CBPI ≥1)	123.66	36	3.44	0.769	0.708	0.567	0.225	0.183–0.269
2-factor (all OA)	162.97	36	4.53	0.763	0.720	0.576	0.249	0.211–0.288
2-factor (OA CBPI ≥1)	126.55	36	3.52	0.761	0.702	0.561	0.229	0.186–0.273

Fit indices estimated were Chi²
df degrees of freedom, Chi ² /df model Chi ² related to its degrees of freedom, CFI comparative fit index, NFI normed fit index, PNFI parsimony adjusted normed fit index, RMSEA root mean squared error of approximation, CBPI Canine Brief Pain Inventory, CI confidence intervals, OA osteoarthritis

ISSN: 1751-0147