Table 1.

The basic information of the included studies.

Number	Study	Year	n	Country	Indicators included in the study
1	Yulong Zhou	2020	17	China	Cough, fatigue, fever, shortness of breath
2	Guang Chen	2020	21	China	Chest tightness, cough, diabetes, diarrhea, fatigue, fever, headache, hypertension, myalgia, shortness of breath, sputum production
3	Chaolin Huang	2020	41	China	Cardiovascular disease, chronic liver disease, chronic respiratory system diseases, cough, diabetes, diarrhea, fever, headache, hypertension, malignancy, shortness of breath, sputum production
4	Yuhuan Xu	2020	50	China	Chest tightness, cough, fatigue, fever, headache, myalgia, sore throat, sputum production
5	Jiaojiao Chu	2020	54	China	Chest tightness, cough, diarrhea, fatigue, fever, myalgia, shortness of breath, sore throat, sputum production
6	Kaicai Liu	2020	73	China	Cough, fatigue, fever, sputum production
7	Hansheng Xie	2020	79	China	Cardiovascular disease, cough, diabetes, diarrhea, fever, hypertension, shortness of breath, sputum production
8	Suxin Wan	2020	135	China	Cardiovascular disease, chronic liver disease, diabetes, hypertension, malignancy
9	Dawei Wang	2020	138	China	Cardiovascular disease, chronic liver disease, chronic renal diseases, chronic respiratory system diseases, cough, diabetes, diarrhea, fever, headache, hypertension, malignancy, shortness of breath, sore throat, sputum production
10	Jinjin Zhang	2020	140	China	Cardiovascular disease, chronic liver disease, chronic renal diseases, chronic respiratory system diseases, diabetes, hypertension
11	Sijia Tian	2020	262	China	Cough, fatigue, fever, headache, shortness of breath
12	Jian Wu	2020	280	China	Chronic liver disease, chronic renal diseases, chronic respiratory system diseases, cough, diarrhea, fever, malignancy, myalgia, shortness of breath, sore throat
13	Qingxian Cai	2020	298	China	Cardiovascular disease, chronic liver disease, cough, diabetes, diarrhea, fatigue, fever, headache, hypertension, malignancy, sore throat
14	Weijie Guan	2020	1099	China	Cardiovascular disease, chronic liver disease, chronic renal diseases, chronic respiratory system diseases, cough, diabetes, diarrhea, fever, headache, hypertension, shortness of breath, sore throat, sputum production
15	Ming Chen	2020	54	China	Cardiovascular disease, chest tightness, chronic respiratory system diseases, cough, fatigue, fever, hypertension, myalgia, shortness of breath
16	Dan Li 1	2020	80	China	Cardiovascular disease, chronic liver disease, chronic renal diseases, chronic respiratory system diseases, diabetes, diarrhea, fatigue, fever, headache, hypertension, malignancy, myalgia, shortness of breath
17	Dan Li 2	2020	30	China	Cardiovascular disease, cough, diabetes, fever, hypertension, shortness of breath
18	Zilong Lu	2020	101	China	Cardiovascular disease, chronic renal diseases, cough, diabetes, fatigue, fever, headache, hypertension, sputum production
19	Qiu Wan	2020	153	China	Chronic liver disease, chronic respiratory system diseases, cough, diabetes, fatigue, fever, hypertension, myalgia, shortness of breath, sputum production
20	Rong Wang	2020	96	China	Cough, diabetes, fever, hypertension
21	Tianxin Xiang	2020	49	China	Chest tightness, chronic liver disease, cough, diabetes, diarrhea, fatigue, fever, hypertension, sore throat, sputum production
22	Wei Zhang	2020	74	China	Cardiovascular disease, chronic liver disease, chronic renal diseases, chronic respiratory system diseases, cough, diabetes, diarrhea, fatigue, fever, headache, hypertension, malignancy, myalgia, shortness of breath, sore throat, sputum production, chest tightness
23	Shuxiang Zhang	2020	34	China	Chronic respiratory system diseases, cough, headache, hypertension, myalgia, sputum production
24	Cancan Zhao	2020	189	China	Cough, diabetes, fever, hypertension, shortness of breath, sore throat, sputum production