“…The grades were defined using the AN ratio as follows: grade 1, 0-25%; grade 2, 25-50%; grade 3, 50-75%; grade 4, 75-100% [9]. The degree of space that both palatine tonsils occupy in the oropharyngeal space was also used to categorize tonsil size from grades 1 to 4 as follows: grade 1, 0-25%; grade 2, 25-50%; grade 3, 50-75%; grade 4, 75-100% [10,11]. We defined adenotonsillary hypertrophy in patients with grade 3 or 4 tonsils and grade 3 or 4 adenoids.…”