목적: Adenotonsillar hypertrophy may cause recurrent tonsillitis and upper airway obstruction in children. The aim of this study was to evaluate long term effect of adenotonsillectomy on growth in childhood and its related factors. 방법:52 patients who underwent adenotonsillectomy 60-72 months before were enrolled in this study. Preoperative clinical data were collected from medical record and postoperative data were collected by telephone survey. Height and weight percentile were calculated with Korean national growth chart. We assessed changes of height and weight percentile and symptoms such as sleep disordered breathing and tonsillitis. 결과:Mean age was 6.0 ± 1.95 (3-10) years at operation and male to female ratio was 31:21. Mean preoperative height and weight percentile were 53.56 ± 27.52 and 59.62 ± 29.33, which were changed to 57.57 ± 27.06 and 59.58 ± 28.77, respectively(p=0.222, 0.992). Height percentile was significantly increased in whose preoperative height was less than 50 percentile (26.93 ± 13.10 and 40.78 ± 24.11, p=0.005) although it was not significantly changed in patients of 50 percentile or more (73.09 ± 16.58 and 69.88 ± 22.27, p=0.451). Weight percentile was also significantly increased in whose preoperative weight was less than 50 percentile (30.42 ± 15.31 and 42.62 ± 26.75, p=0.036) and decreased in patients of 50 percentile or more (81.02 ± 14.91 and 72.02 ± 23.65, p=0.040). Among the patients whose height or weight was less than 50 percentile, they were significantly increased in whom have both of frequent tonsillitis and sleep disordered breathing, whereas not in patients having either of symptoms. Preoperative symptoms such as frequent tonsillitis, low appetite and sleep disordered breathing were improved after surgery (p<0.05 in all). 결론:Adenotonsillectomy has a positive effect on growth in childhood especially in patients whose growth percentile is less than 50 and in patients with both of frequent tonsillitis and sleep disordered breathing.