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Table 6 Best fit factorial model for WURSS-44

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

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
  1. 3* = Data from day 3 was used for original model
  2. CFA = Confirmatory Factor Analysis
  3. CFI = Comparative Fit Index
  4. TLI = Tuker-Lewis Index
  5. RMSEA = Root Mean Square Error of Approximation
  6. WRMR = Weighted Root Mean Square Residual
  7. Hu and Bentler (1999)[58] suggest the following cut off values for good fit, CFI > .95, TLI > .95, RMSEA < .06, and WRMR < .90