Table 2.

Comparison of model fit indices of Model I, Model II and Model III

Nested models	χ2 (df)	Scaling correction factor	CFI	TLI	RMSEA (90% CI)	χ2 difference test (p)
Model I	495.03 (148)	1.12	0.94	0.93	0.09 (0.08-0.10)	-
Model II	499.87 (158)	1.12	0.94	0.93	0.08 (0.08-0.09)	p>0.10
Model III	420.69 (154)	1.13	0.96	0.95	0.08 (0.07-0.08)	p<0.001

Model II is nested within Model I and Model III

Compared with Model I, Model II removed the paths from gender to Perceived Self-efficacy and Perceived Response efficacy, from Age to Perceived Severity and Perceived Response efficacy, from Education to Perceived Severity, Perceived Vulnerability and Perceived Self-efficacy, and from years of raising poultry to Perceived Severity, Perceived Vulnerability and Perceived Response efficacy

Compared with Model II, Mode III added covariance for the relationships of Perceived Vulnerability with Perceived Self-efficacy and Perceived Response efficacy, and the relationships of Perceived Self-efficacy with Perceived Severity and Perceived Response efficacy