Table 1.
The complete list of ICD-9-CM codes in the categories of surgical indications (top three diagnoses).
Fig 1.
The incidence of adenotonsillectomies per one million population by the calendar year.
The adenotonsillectomy rate fluctuates. Linear regression analysis shows an increasing trend in the total study population, in the adult group and in the pediatric group.
Table 2.
Number and percentage of patients who received tonsillectomy alone or tonsillectomy with adenoidectomy by age groups.
Fig 2.
New cases of adenotonsillectomy per one million population of the three categories of surgical indications by the calendar year.
2a: the total study population, 2b: the adult subgroup (≥18 years), 2c: the pediatric subgroup (<18 years). RICI: recurrent infection or chronic inflammation; UAO: tonsillar hypertrophy or upper airway obstruction; Tumor: suspicious benign or malignant neoplasms.
Fig 3.
Stacked percentage of three categories of surgical indications for adenotonsillectomy by the calendar year.
3a: the total study population, 3b: the adult subgroup (≥18 years), 3c: the pediatric subgroup (<18 years). RICI: recurrent infection or chronic inflammation; UAO: tonsillar hypertrophy or upper airway obstruction; Tumor: suspicious benign or malignant neoplasms.
Table 3.
The number and percentage of the three categories of surgical indications according to sex, age groups, hospital level, and insured residence areas in the total study population.
Table 4.
The number and percentage of the categories of surgical indications according to sex, age, hospital level, and insured residence areas in the adult subgroup (≥18y).
Table 5.
The number and percentage of the categories of surgical indications according to sex, age, hospital level, and insured residence areas in the pediatric subgroup (<18y).