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Table 6 Fit statistics of the Epworth Sleepiness Scale (ESS) scores in Ethiopian university students

From: Psychometric properties of the Epworth sleepiness scale in Ethiopian university students

Models GFI IFI CFI RMR RMSEA χ2 df p χ2/df
A .97 .94 .94 .04 .06(.04–.09) 45.31 20 .001 2.27
B .98 .96 .96 .04 .06(.02–.10) 20.26 9 .016 2.25
C .97 .95 .95 .04 .06(.04–.08) 41.25 19 .002 2.17
D .98 .99 .99 .03 .03(.00–.06) 22.61 18 .206 1.26
  1. A: 1-Factor model, B: 1-Factor model (Smith et al. 2008), C: 2-Factor model (Gelaye et al. 2014),
  2. D: 1-Factor model with incorporation of modification indices (co-varying error terms)
  3. GFI: Goodness of fit index, IFI: Incremental Fit Index, CFI: Comparative Fit Index, RMR: root mean square residual, RMSEA: root mean square error of approximation
  4. Smith SS, Oei TP, Douglas JA, Brown I, Jorgensen G, Andrews J. Confirmatory factor analysis of the Epworth Sleepiness Scale (ESS) in patients with obstructive sleep apnoea. Sleep medicine. 2008 Oct 1;9(7):739–44
  5. Gelaye B, Lohsoonthorn V, Lertmeharit S, Pensuksan WC, Sanchez SE, Lemma S, Berhane Y, Zhu X, Vélez JC, Barbosa C, Anderade A. Construct validity and factor structure of the pittsburgh sleep quality index and epworth sleepiness scale in a multi-national study of African, South East Asian and South American college students. PloS one. 2014 Dec 31;9(12):e116383