Table 1. Characteristics of included studies.

GI, gastrointestinal; COVID, coronavirus disease; LFTs, liver function tests; CT, computed tomography; ICU, intensive care unit; N/A, not applicable.

Author	Location	Study patient subset	COVID-19 patients	Age in median (years)	male (%)	Any GI symptom	Elevated LFTs	Severe COVID-19
Chen H [7]	China	N/A	21	56	81	4	6	11
Chen Q [8]	China	N/A	9	42.1	55.5	2	N/A	4
Guan WJ [9]	China	N/A	1099	47	58.1	42	158	173
Huang C [10]	China	Patients with COVID pneumonia	38	49	73	1	15	13
Hajifathalian K [11]	USA	NA	1059	61.1	57.7	350	657	NA
Jin X [1]	China	N/A	651	45	50.8	74	N/A	64
Li K [12]	China	Patients with respiratory symptoms who had a CT	83	45.5	53	7	N/A	25
Lian J [5]	China	N/A	465	45	52.26	36	99	49
Liu F [13]	China	N/A	10	42	40	3	N/A	5
Red [3]	USA	NA	318	63.4	54.7	195	NA	NA
Wan Y [14]	China	NA	230	47.9	56	49	N/A	61
Xia XY [15]	China	Familial cluster	10	56.5	60	2	N/A	3
Yang X [16]	China	ICU patients with COVID pneumonia	52	59.7	67	2	N/A	52
Zhang H [2]	China	N/A	505	51.2	45.1	164	N/A	92
Zhang J [6]	China	NA	663	55.6	48.4	61	171	409
Zhang JJ [2]	China	Patients with respiratory symptoms	140	57	50.7	55	N/A	58
Zhang R [17]	China	Patients with COVID-19 pneumonia	120	45.4	36	10	N/A	30
Zhao XY [18]	China	N/A	91	46	53.8	14	N/A	30
Zhou Z [19]	China	Patients with COVID-19 pneumonia	254	50	45.3	46	NA	NA
Pan L [20]	China	NA	204	52.9	52	101	0	1