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Table 4 Goodness-of-fit indices from confirmatory factor analysis

From: Psychometric properties of the World Health Organization quality of life assessment – brief in methadone patients: a validation study in northern Taiwan

 

Best suggestion

χ2

RMSEA (90% CI)

CFI

NNFI

Original model

 

1093.71

0.073 (0.068 ~ 0.078)

0.87

0.86

Modified model 1

add cov (Psyc7, En8)

1025.10

0.070 (0.065 ~ 0.075)

0.89

0.87

Modified model 2

add cov (En9, Phy10)

965.93

0.067 (0.062 ~ 0.072)

0.89

0.88

Modified model 3

add cov (Phy3, Phy4)

906.85

0.064 (0.060 ~ 0.069)

0.90

0.89

Modified model 4

add cov (Psyc5, Psyc6)

856.15

0.062 (0.057 ~ 0.067)

0.91

0.90

Modified model 5

add Psyc-En8

834.17

0.061 (0.056 ~ 0.066)

0.91

0.90

Final model

add cov (En8, En9)

812.49

0.060 (0.055 ~ 0.065)

0.92

0.91

  1. RMSEA: root mean square error of approximation; CI: confidence interval; CFI: comparative fit index; NNFI: non-normed fit index.
  2. Confirmatory factor analyses were performed while controlling for age, education, gender, HIV, HCV, duration of heroin use, methadone dose and days stayed in MMT at study interview.