Table 1

Study characteristics

Study	Country	Study type	Total number of patients	Male	Female	Age range (years)	Median age (years)	Severe disease	Non-severe disease	Nausea and/or vomiting	Diarrhoea	Anorexia	Abdominal pain
Huang et al 11	China	PO	41	30	11	41–50	49.0	13	28	NA	1	NA	NA
Chen et al 2	China	CS	9	0	9	<30	29.9	NA	NA	NA	1	NA	NA
Chan et al 15	China	CS	6	3	3	41–50	50.0	NA	NA	NA	2	NA	NA
Chen et al 7	China	RO	99	67	32	51–60	55.5	NA	NA	1	2	NA	NA
Young et al 26	Singapore	RO	18	9	9	41–50	47.0	NA	NA	NA	3	NA	NA
Xu et al 12	China	RO	62	35	27	41–50	41.0	NA	NA	NA	3	NA	NA
COVID-19, Australia: Epidemiology Report 2	Australia	CS	15	9	6	41–50	43.0	NA	NA	1	5	NA	NA
Huang Y et al 31 (Elsevier)	China	RO	34	14	20	51–60	56.2	NA	NA	NA	5	NA	NA
Song et al 23	China	RO	51	25	26	41–50	49.0	NA	NA	3	5	9	NA
Wu et al 32; Investigative Radiology	China	RO	80	42	38	41–50	44.0	NA	NA	NA	7	NA	NA
Yang et al 10	China	RO	149	81	68	41–50	45.1	NA	NA	2	11	NA	NA
Wang et al 9	China	RO	138	75	63	51–60	56.0	36	102	19	14	NA	3
Zhang et al 8	China	RO	140	71	69	51–60	57.0	58	82	24	18	17	8
Pan et al 14	China	RO	204	107	97	51–60	52.9	27	66	4	35	81	2
Xiao et al 16	China	RO	73	41	32	41–50	43.0	NA	NA	NA	26	NA	NA
Guan et al 22	China	RO	1099	640	459	41–50	47.0	173	926	55	42	NA	NA
Zhou et al 24	China	RO	191	119	72	51–60	56.0	119	72	7	9	NA	NA
Sum (n)			2477	1406	1071	Weighted average −>	49.077	426	1276	116	194	107	13

CS, case series; NA, not applicable; PO, prospective observational study; RO, retrospective observational study.