2. Johns MW. Reliability and factor analysis of the Epworth Sleepiness Scale. Sleep 1992;15:376-381.
6. Hoddes E, Zarcone V, Smythe H, Phillips R, Dement W. Quantification of sleepiness: a new approach. Psychophysiology 1973;10:431-436.
7. Johns MW. Daytime sleepiness, snoring, and obstructive sleep apnea: the Epworth Sleepiness Scale. Chest 1993;103:30-36.
8. Tsara V, Serasli E, Amfilochiou A, Constantinidis T, Christaki P. Greek version of the Epworth sleepiness scale. Sleep and Breathing 2004;8:91-95.
11. Chen NH, Johns MW, Li HY, Chu CC, Liang SC, Shu YH, et al. Validation of a Chinese version of the Epworth sleepiness scale. Qual Life Res 2002;11:817-821.
13. Bloch KE, Schoch OD, Zhang JN, Russi EW. German version of the Epworth sleepiness scale. Respiration 1999;66:440-447.
14. Kim DK. The natural environment control system of Korean traditional architecture: Comparison with Korean contemporary architecture. Build Environ 2006;41:1905-1912.
15. (KOSIS) KSIS. Research on Commuting Patterns in Korea. Daejeon: Korean Statistical Information Service (KOSIS); 2015.
16. (KOTI) TKTI. An investigation on usage patterns of vehicles in Korea. The Korea Transport Institute (KOTI); 2013, p. 1-157.
18. Takegami M, Suzukamo Y, Wakita T, Noguchi H, Chin K, Kadotani H, et al. Development of a Japanese version of the Epworth Sleepiness Scale (JESS) based on item response theory. Sleep Med 2009;10:556-565.
19. Janssen KC, Phillipson S, O’Connor J, Johns MW. Validation of the Epworth Sleepiness Scale for children and adolescents using Rasch analysis. Sleep Med 2017;33:30-35.
21. Olson L, Cole M, Ambrogetti A. Correlations among Epworth Sleepiness Scale scores, multiple sleep latency tests and psychological symptoms. J Sleep Res 1998;7:248-253.
22. Wise MS. Objective measures of sleepiness and wakefulness: application to the real world? J Clin Neurophysiol 2006;23:39-49.