Analysis of outpatient visits
We analyzed the number of outpatient visits with adenoid hypertrophy as the diagnosis between 2017 and 2021 and found that the number of outpatient visits with adenoid hypertrophy before COVID-19 increased from 2017 to 2019 (P = 0.000 and 0.004, respectively). In 2020, the number of patients with adenoid hypertrophy decreased significantly (P=0.000) and increased again in 2021, as shown in Figure 3 and Table 2. However, the comparison between the data in 2019 and 2021 showed no significant difference, P=0.116.