Impact of Non-Pharmaceutical Interventions on the Incidence and Treatment of Chronic Rhinosinusitis during the COVID-19 Pandemic: A Nationwide Retrospective Cohort Study.

In the ITS analysis, the number of outpatients (estimated coefficient for level change β 3 = −2709; 95% CI from −3318 to −2100; p < 0.001) and hospitalized patients (β 3 = −64.53; 95% CI from −93.16 to −35.90; p < 0.001) due to CRS showed an increasing trend during the pre-pandemic period but began to decrease after the onset of the pandemic ( Figure 1 B,C; Table 3 ). 3.3.

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