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Table 5 Fit indices of the first- and second-order confirmatory factor analysis of the E-RAS

From: Design and psychometric evaluation of epilepsy-related apathy scale (E-RAS) in adults with epilepsy: a sequential exploratory mixed methods design

CFA

χ2

df

P-value

CMIN/df

RMSEA

PCFI

PNFI

AGFI

IFI

CFI

First-order after structure modification

577.195

241

< 0.001

2.39

0.075

0.64

0.68

0.70

0.92

0.91

Second-order after structure modification

480.868

239

< 0.001

2.01

0.062

0.72

0.83

0.88

0.95

0.96

  1. Abbreviations: E-RAS epilepsy– related apathy scale, CFA confirmatory factor analysis, CMIN/DF Chi-square/degree-of-freedom ratio, RMSEA Root Mean Square Error of Approximation, PCFI Parsimonious Comparative Fit Index, PNFI Parsimonious Normed Fit Index, AGFI Adjusted Goodness-of-Fit Index, IFI Incremental Fit Index, CFI Comparative Fit Index
  2. Fit indices: PNFI, PCFI, AGFI (> 0.5), CFI, IFI (> 0.9), RMSEA (> 0.08), CMIN/DF (> 3 good, > 5 acceptable)