“…The frequencies (see Table 9) were significantly different and suggest a 1.7 times greater risk of EDS for those subjects working more than 80 hours per week. An association between higher work hours in a week and EDS has been demonstrated in several studies from a number of different countries, including Canada (Hanlon et al, 2009), New Zealand (Gander et al, 2007), United States (Defoe et al, 2001;Gander et al 2007), Australia (Dorrian et al, 2006), Japan and others (Groeger, Zijlstra, & Dijk, 2004;Jagsi et al, 2008;Jewett, Dijk, Kronauer, & Dinges, 1999;Kaneita et al, 2005;Klerman & Dijk, 2005;Liu, Uchiyama, Kim, et al, 2000;Ohida et al, 2004;Skeff, Ezeji-Okoye, Pompei, & Rockson, 2004;Steinbrook, 2002).…”