목적: Adenotonsillar hypertrophy is the major determinants of habitual snoring in pediatric population. We previously reported that the presence of habitual snoring in young children is associated with wide spectrum of behavioral problems, using outpatient-based psychological screening tools. The aim of the present study is to evaluate the improvements of emotional and behavioral problems 1 year after adenotonsilectomy, along with changes of weight status. 방법:Total 105 patients who underwent adenotonsilectomy were enrolled. Body mass index (BMI) z-score was obtained for age and gender and parental sleep-related breathing disorder (SRBD) questionnaire was used to assess severity of sleep-disordered breathing (SBD). Psychological assessment was performed pre- and post-surgery using standardized questionnaires including Strength and Difficulties Questionnaire (SDQ), Childrens Depression Inventory (CDI) and Screen for Child Anxiety Related Emotional Disorders (SCARED). 결과:Children presenting habitual snoring had significantly higher mean scores on almost all scales of SDQ, and SCARED than community controls. The scores for emotional distress and hyperactivity were more prominent in the obese children. The children showed significant improvements in all behavioral subscales at 1 year follow-up. Overall, the postoperative BMI z-score increased from 0.0+/-1.6 to 0.32+/-1.3. However, the behavioural ratings were not affected by the weight gain after adenotonsilectomy. 결론:Our findings suggest that the presence of habitual snoring in young children is associated wide spectrum of behavioral problems and these behavioral problems could be improved postoperatively if the adenotonsilectomy successfully treated the respiratory symptoms of sleep-disordered breeding.