Study population
One hundred four patients were eligible for the study. The median age was 6.5 months (IQR: 4.0-10.0). Sixty-nine (66.3%) of the patients were male and 35 (33.7%) were female. According to the mRDAI scoring, 71 (68.3%) patients were in the mild group (mRDAI score: 0-4), 27 (26.0%) in the moderate group (mRDAI score: 5-8), and 6 (5.7%) in the severe group (mRDAI score: 9-12). When the patients were classified by BUS, 55 (52.9%) patients were in the mild group (BUS: 1-3), 46 (44.2%) were in the moderate group (BUS: 4-6), and 3 (2.9%) were in the severe group (BUS: 7-8). All 6 patients in the severe mRDAI group required high-flow nasal cannula (HFNC) oxygen therapy within two hours after admission. The median length of stay in the pediatric emergency department was 26 hours (IQR: 12.0-48.0). Ten patients (10.3%) were admitted to the ward and the median length of stay in the ward was 143 hours (IQR: 100.0-191.0). The median length of total stay in the hospital was 27 hours (IQR: 12.0-54.0) (min: 4, max: 291 hours).