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Table 9 Best fit factorial model for WURSS-21

From: Validation of a short form Wisconsin Upper Respiratory Symptom Survey (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
  1. 3* = D ata from day 3 was used for original model
  2. CFI = Comparative Fit Index
  3. TLI = Tuker-Lewis Index
  4. RMSEA = Root Mean Square Error of Approximation
  5. WRMR = Weighted Root Mean Square Residual
  6. Hu and Bentler (1999)[58] suggest the following cut off values for good fit, CFI > .95, TLI > .95, RMSEA < .06, and WRMR < .90