Validation of a short form Wisconsin Upper Respiratory Symptom Survey (WURSS-21)

Table 6 Best fit factorial model for WURSS-44

CFA Final model structure for the WURSS-44 at day 3
Dimensions 8 restricted	Chi-square	df	χ²/df	CFI
	296.2	69	4.29	.951
Number of items used = 34		TLI	RMSEA	WRMR
		.991	.120	.975
Time invariance (configural invariance) Days 2 to 7
Day	CFI	TLI	RMSEA	WRMR
2	.935	.985	.123	1.040
3*	.951	.991	.120	.975
4	.957	.992	.119	.913
5	.972	.995	.105	.843
6	.982	.995	.106	.856
7	.974	.995	.097	.761

3* = Data from day 3 was used for original model
CFA = Confirmatory Factor Analysis
CFI = Comparative Fit Index
TLI = Tuker-Lewis Index
RMSEA = Root Mean Square Error of Approximation
WRMR = Weighted Root Mean Square Residual
Hu and Bentler (1999)[58] suggest the following cut off values for good fit, CFI > .95, TLI > .95, RMSEA < .06, and WRMR < .90

ISSN: 1477-7525