BACKGROUND To study the effectiveness of adenotomy (AT), adenotonsillectomy (ATE) and adenotonsillotomy (ATT) with respect to the quality of life improvement in children with obstructive sleep disorders (OSD), OSA 18 survey and Brouillette score were used. METHODS Prospectively, 92 children with an age ranging from 2 to 6 years with OSD underwent AT, ATE or ATT at the University hospital of Ulm (Germany), respectively. 30 age-matched children served as controls. Caregivers were requested to complete the Brouillette score and the OSA 18 survey, which are validated instruments for detecting symptoms and quality of life change in children with OSDs, at the initial office visit prior to surgery (BS/1 and OSA 18/1) and 7 - 14 months after surgery (BS/2 and OSA 18/2). RESULTS The mean total score of the OSA 18 survey for AT, ATE and ATT was reduced significantly after these operations (p < 0.001). Similar results were also observed in the Brouillette score (p < 0.002). The improvement of life quality in the AT group was less effective than in the ATE and ATT group. CONCLUSIONS ATE and ATT have about the same effectiveness to improve life quality for children with OSD. Children after ATE or ATT have a comparable life quality as healthy children (Mann Whitney U-test; p approximately 0.15), while children who only received AT have a slightly lower life quality after the operation. In summary, ATT was recommend.