 However, the Childhood Adenotonsillectomy Trial addressed the role of surgery in the minority of operative candidates who have frank obstructive sleep apnea, only one form of sleep disordered breathing on a spectrum that includes a more common phenotype, primary snoring also termed mild sleep disordered breathing MSDB. Mild sleep disordered breathing is characterized by snoring without frank obstruction or gas exchange abnormalities, and has a population prevalence of about 10 in children. Since most surgeries for obstructed breathing are performed for mild sleep disordered breathing rather than obstructive sleep apnea, the next logical question is whether surgery is also effective in improving symptoms and health outcomes in this large group of children. 