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Table 2 Fit index for unidimensionality assumption

From: Evaluation of psychometric properties and differential item functioning of 8-item Child Perceptions Questionnaires using item response theory

  RSF:8 ISF:8
PCA
 % of variance explained by first PC 32.2 % 30.9 %
 Ratio of first PC to second PC 2.11 2.22
 Number of first PC factor loading >0.33 7 out of 8 8 out of 8
CFA
 RMSEA 0.088 0.102
 NFI 0.90 0.84
 CFI 0.91 0.85
 p-value (Chi-square test) <0.001 <0.001
 GFI 0.96 0.94
 Standardized RMSR 0.041 0.043