Table 3. Changes in the number of inpatients by disease categories during the COVID-19 pandemic.

Hospital level	Primary diagnosis	January–April		Change	Proportion in total change (%)	% change	RR (95% CI)†
		2019 (comparison)	2020 (COVID-19)
First-level	Respiratory infection	2,436	924	−1,512	96.2	−62.1	0.38 (0.35, 0.41)
	Other infections	132	67	−65	4.1	−49.2	0.51 (0.38, 0.68)
	Injury	6	4	−2	0.1	−33.3	0.67 (0.19, 2.37)
	Other diseases	22	29	7	−0.4	31.8	1.32 (0.76, 2.30)
	Total	2,596	1,024	−1,572	100	−60.6	0.39 (0.36, 0.42)
Second-level	Respiratory infection	27,709	11,378	−16,331	80.7	−58.9	0.41 (0.40, 0.42)
	Other infections	5,197	2,648	−2,549	12.6	−49.1	0.51 (0.49, 0.53)
	Injury	191	165	−26	0.1	−13.6	0.86 (0.70, 1.06)
	Other diseases	5,152	3,809	−1,343	6.6	−26.1	0.74 (0.71, 0.77)
	Total	38,249	18,000	−20,249	100	−52.9	0.47 (0.46, 0.48)
Third-level	Respiratory infection	22,969	9,917	−13,052	67.5	−56.8	0.43 (0.42, 0.44)
	Other infections	5,605	3,381	−2,224	11.5	−39.7	0.60 (0.57, 0.63)
	Injury	787	892	105	−0.5	13.3	1.13 (1.03, 1.24)
	Other diseases	16,497	12,334	−4,163	21.5	−25.2	0.75 (0.73, 0.77)
	Total	45,858	26,524	−19,334	100	−42.2	0.58 (0.57, 0.59)
All	Respiratory infection	53,114	22,219	−30,895	75.1	−58.2	0.42 (0.41, 0.43)
	Other infections	10,934	6,096	−4,838	11.8	−44.3	0.56 (0.54, 0.58)
	Injury	984	1,061	77	−0.2	7.8	1.08 (0.99, 1.18)
	Other diseases	21,671	16,172	−5,499	13.4	−25.4	0.75 (0.73, 0.77)
	Total	86,703	45,548	−41,155	100	−47.5	0.53 (0.52,0.54)

^†, statistical significance of changes in ratios were determined if the 95% CI of the RR excluded 1.0. CI, confidence interval; RR, rate ratio; COVID-19, coronavirus disease 2019.