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To systematically review the scoring systems used to report findings during drug-induced sleep endoscopy (DISE) for adults and children with obstructive sleep apnea.PubMed, CINAHL, EBM Reviews, Embase, and Scopus databases.This is a systematic review of all indexed years of publications referring to scoring of DISE for children and adults with obstructive sleep apnea. The type of DISE scoring system utilized was the primary outcome. PRISMA guidelines were followed to carry out this review; articles were independently reviewed by 2 investigators. All pediatric and adult studies that utilized ≥1 DISE grading systems were included.Of 492 identified abstracts, 44 articles (combined population, N = 5784) were ultimately included; 6 reported on children, 35 on adults, and 1 on children and adults. Twenty-one reporting methods were used in these studies, with the most common being the VOTE system (velum, oropharynx, tongue base, and epiglottis; 38.6%) and the Pringle and Croft classification (15.9%). The sites of obstruction most commonly included in a scoring system were the tongue base (62%), lateral pharynx/oropharynx (57%), palate (57%), epiglottis/supraglottis (38%), and hypopharynx (38%). Less commonly included sites were the larynx (29%), velum (23%), nose (23%), tongue (14%), adenoids (10%), and nasopharynx (10%).There is no consensus regarding which scoring system should be utilized to report findings during DISE. The VOTE system and the Pringle and Croft classification were the most frequent scoring systems reported for patients undergoing DISE. Standardization of the reporting of DISE findings would improve comparability among studies.