TODENTJ-25-03-2019_TODENTJ-9-31 1553505622 Bentham Open doi@benthamopen.net Bentham Open The Open Dentistry Journal TODENTJ 1874-2106 1 30 2015 9 1 Min Gu Yanqi Yang Angus C.H Ho Ricky W.K Wong Urban Hägg Colman P.J McGrath The present cross-sectional study aimed to assess daytime sleepiness in Chinese adolescents using the Paediatric Daytime Sleepiness Scale (PDSS) and to identify associations between PDSS answers and craniofacial characteristics. A group of 265 Chinese adolescents aged 11-17 years self-completed the PDSS, and their extra- and intra-oral craniofacial characteristics were recorded. Among the participants, 59.7% (157) experienced one or more daytime sleepiness events. No significant associations were found between total PDSS scores and the craniofacial parameters, but when PDSS answers were assessed at the item level, several craniofacial characteristics were found to be positively associated with daytime sleepiness, such as hypertrophic tonsils (P = 0.05), a relatively large tongue (P < 0.01), a bilateral Class II molar relationship (P < 0.05) and increased overjet (P < 0.05). A short lower face (P < 0.01) and a convex profile (P < 0.01) were found to be negatively associated with daytime sleepiness. Daytime sleepiness is commonly reported among Chinese adolescents seeking orthodontic treatment and there are potential associations between the condition and craniofacial characteristics. An assessment of daytime sleepiness is recommended to orthodontists in young patients presenting with hypertrophic tonsils, relative large tongues and Class II tendency malocclusions, and appropriate medical referrals should also be considered. 1 30 2015 31 40 TODENTJ-9-31 1 10.2174/crossmark_policy opendentistryjournal.com benthamopen.com true Peer Reviewed Single blind Checked with iThenticate 2014-10-8 2014-11-10 2014-11-27 2015-1-30 http://creativecommons.org/licenses/by-nc/3.0/ 10.2174/1874210601509010031 1553505622 https://opendentistryjournal.com/VOLUME/9/PAGE/31/ https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.pdf https://opendentistryjournal.com/contents/volumes/V9/TODENTJ-9-31/TODENTJ-9-31.xml Sleep. 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