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Table 4: Frequency distribution of the sites of obstruction

SBAS = Patients with primary snoring or OSAS; OSAS = Only patients with OSAS; Palatal = Nasopharynx, tonsils, soft palate and/or lateral pharyngeal wall; Retrolingual = tongue base and/or hypopharynx; Epiglottis = exclusively epiglottis; No result = Either the method was not tolerated or the result was not utilisable