Models

GFI

AGFI

CFI

RMSEA

RMR

χ
^{2}

df

p

χ
^{2}/df

ECVI


ModelA

0.79

0.58

0.32

0.34

0.29

528.06

14

<0.01

37.72

1.79

ModelB

0.98

0.95

0.98

0.06

0.04

22.26

10

0.01

2.23

0.19

ModelC

0.80

0.57

0.35

0.35

0.29

508.91

13

<0.01

39.15

1.74

ModelD

0.74

0.23

0.33

0.56

0.40

490.30

5

<0.01

98.06

1.65

ModelE

0.98

0.91

0.98

0.11

0.05

15.09

3

<0.01

5.031

0.13

 ModelA: 1Factor model of the PSQI with all the seven components; ModelB: 1Factor model of the PSQI with all the seven components and incorporation of modification index (correlations between error terms); ModelC: 2Factor model of the PSQI (Factor1 comprised of SLPQUAL, LATEN, DURAT, HSE, DISTB; Factor2 comprised of MEDS, DAYDYS); ModelD: 1Factor model of the PSQI with only five components (without MEDS and DAYDYS); ModelE: 1Factor model of the PSQI with only five components (without MEDS and DAYDYS) with incorporation of modification index (correlations between error terms)

GFI goodness of fit index, AGFI adjusted goodness of fit index, CFI comparative fit index, RMSEA root mean square error of approximation, RMR root mean square residual, ECVI expected crossvalidation index
 SLPQUAL: PSQI component of sleep quality, LATEN: PSQI component of sleep latency, DURAT: PSQI component of sleep duration, HSE: PSQI component of sleep efficiency, DISTB: PSQI component of sleep disturbances, MEDS: PSQI component of sleep medication, DAYDYS: PSQI component of daytime dysfunction