Validation of the Arabic Version of the Epworth Sleepiness Scale among the Yemeni Medical Students

Figure 1

The hypothesised model of the 8-item ESS. e2-e8: car-S-R represent error variances; double-headed arrows represent correlation between two factors; single-headed arrows from factors depict factor loading to items. S-T: sitting and talking; car: in a car while stopped a few minutes; passenger: as a passenger in a car for an hour without a break; quietly: sitting quietly after a lunch; lying: lying down to rest in afternoon; TV: watching TV; P-P: public places; S-R: sitting and reading.