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Table 4 Inter-item Correlation matrix of the Epworth Sleepiness Scale (ESS) scores in Ethiopian university students

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

  ESS item-1 ESS item-2 ESS item-3 ESS item-4 ESS item-5 ESS item-6 ESS item-7 ESS item-8
ESS item-1   .40** .31** .32** .27** .28** .24** .26**
ESS item-2    .32** .23** .25** .34** .28** .23**
ESS item-3     .38** .26** .36** .36** .36**
ESS item-4      .36** .26** .26** .32**
ESS item-5       .14* .25** .12*
ESS item-6        .29** .35**
ESS item-7         .30**
ESS item-8         
  1. * p < 0.05; ** p < 0.01