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

Table 9 Best fit factorial model for WURSS-21

CFA Final model structure of the WURSS-21 at day 3
Dimensions 3 restricted	Chi-square	df	χ²/df	CFI
	245.7	37	6.6	0.949
Number of items used = 20		TLI	RMSEA	WRMR
		0.990	0.157	1.074
Time invariance (configural invariance) Days 2 to 7
Day	CFI	TLI	RMSEA	WRMR
2	0.903	0.978	0.170	1.234
3*	0.949	0.990	0.157	1.074
4	0.962	0.993	0.157	1.047
5	0.970	0.995	0.145	0.973
6	0.983	0.995	0.147	1.030
7	0.980	0.995	0.132	0.909

3* = D ata from day 3 was used for original model
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