Table 1. Demographic characteristics of the patients.

Characteristics	Secondary hospital (n=17,974)	Tertiary hospital (n=35,331)	Specialized hospital (n=10,309)	P
Discharge year, number (%)
2018	7,925 (44.1)	16,003 (45.3)	4,015 (38.9)	<0.001
2019	8,443 (47.0)	16,292 (46.1)	4,274 (41.5)
2020	1,606 (8.9)	3,036 (8.6)	2,020 (19.6)
Gender, number (%)
Male	9,650 (53.7)	18,952 (53.6)	5,641 (54.7)	0.80
Female	8,324 (46.3)	16,379 (46.4)	4,668 (45.3)
Age (years), median (IQR)	3.9 (2.4, 5.8)	3.9 (2.1, 5.9)	2.2 (0.5, 5.1)	<0.001
Age distribution (years), number (%)
<1 (n=6,134)	635 (3.5)	1,846 (5.2)	3,653 (35.4)	<0.001
1~3 (n=24,354)	7,152 (39.8)	13,955 (39.5)	3,247 (31.5)
4~6 (n=21,157)	6,830 (38.0)	12,430 (35.2)	1,897 (18.4)
7~12 (n=11,381)	3,244 (18.0)	6,768 (19.2)	1,369 (13.3)
13~18 (n=588)	113 (0.6)	332 (0.9)	143 (1.4)
Region, number (%)
Local	15,773 (76.6)	25,733 (69.1)	3,163 (30.7)	<0.001
Other provinces	2,201 (23.4)	9,598 (30.9)	7,146 (69.3)
Season, number (%)
Spring (Mar–May)	5,410 (30.1)	11,341 (32.1)	3,216 (31.2)	<0.001
Summer (Jun–Aug)	4,260 (23.7)	7,879 (22.3)	1,990 (19.3)
Autumn (Sept–Nov)	3,397 (18.9)	6,819 (19.3)	2,309 (22.4)
Winter (Dec–Feb)	4,907 (27.3)	9,292 (26.3)	2,794 (27.1)
Severity, number (%)
Severe	2,270 (12.6)	9,397 (26.6)	6,929 (67.2)	<0.001
Non-severe	15,704 (87.4)	25,934 (73.4)	3,380 (32.8)
Means of payment, number (%)
Social medical insurance	7,973 (44.4)	15,235 (43.1)	4,533 (44.0)	<0.001
Commercial health insurance	2,443 (13.6)	9,218 (26.1)	1,848 (17.9)
Self-paying	7,558 (42.0)	10,878 (30.8)	3,928 (38.1)
Disease outcome, number (%)
Cured or improved	17,615 (98.0)	34,615 (98.0)	10,202 (99.0)	<0.001
Failed	297 (1.7)	485 (1.4)	35 (0.3)
Discharged against-advice	62 (0.3)	231 (0.7)	72 (0.7)
Length of hospital stay (days), median (IQR)	6.0 (5.0, 8.0)	7.0 (5.0, 8.0)	5.0 (4.0, 7.0)	<0.001

IQR, interquartile range.