Table 1.
Backgrounds of patients with COVID-19 in the eligible studies.
| Study (publication date) | Province in China | Observational period | No. of patients | Exposure history to Hunan Seafood Wholesale Market in Wuhan, n (%) | Sex-male, n (%) | Age, median (IQR), yr. | |
|---|---|---|---|---|---|---|---|
| Group 1 | Huang C [2] (Jan 24, 2020) | Hubei | Dec 16, 2019–Jan 2, 2020 | 41 | 27 (66) | 30 (73.1) | 49.0 (41.0–58.0) |
| Chen N [6] (Jan 29, 2020) | Hubei | Jan 1, 2020–Jan 20, 2020 | 99 | 49 (49) | 67 (67.7) | 55.5 (13.1)a | |
| Wang D [20] (Feb 7, 2020) | Hubei | Jan 1, 2020–Jan 28, 2020 | 138 | 12 (8.7 | 75 (54.3) | 56 (42–68) | |
| Group 2 | Liu K ]21] (Feb 7, 2020) | Hubei | Dec 30, 2019–Jan 24, 2020 | 137 | None | 61 (44.5) | 57 (range, 20–83) |
| Zhang JJ [22] (Feb 19, 2020) | Hubei | Jan 16, 2020–Feb. 3, 2020 | 140 | Living in Wuhan | 71 (50.7) | 57 (25–87) | |
| Guan W [23] (Feb 28, 2020) | 30 provinces | Dec 11, 2019–Jan 31, 2020 | 1099 | Living in Wuhan, 489 (44.5) Recently visited Wuhan, 193/616 (31.3) | 637 (58.1) | 47 (35–58) | |
| Group 3 | Song F et al. [24] (Feb 6, 2020) | Shanghai | Jan 20, 2020–Jan 27, 2020 | 50 | 50 (98) had some contact with individuals from Wuhan | 25 (49) | 49 (16)a |
| Xu XW [25] (Feb 19, 2020) | Zhejiang | Jan 10, 2020–Jan 26, 2020 | 62 | Exposure history in Wuhan > 2 weeks, 23 (37) | 35 (56) | ≤18, 2 (3) | |
| 19-40.25 (40) | |||||||
| 41-65, 33 (53) | |||||||
| ≥66, 2 (3) | |||||||
| Xu YH [26] (Feb 25, 2020 | Hebei | January and February 2020 | 50 | Wuhan or nearby, 30 (60) | 29 (58) | <18, 5 (10) 18-50.30 (60) >50, 15 (30) | |
| Close contact, 18 (36) | |||||||
| Tian S [7] (Feb 26, 2020 | Beijing | Jan 20, 2020–Feb 10, 2020 | 262 | Had been to Wuhan in 14 days, 106 (40.5) | 127 (48.5) | 47.5 (range, 1–04) | |
| Contacted with a symptomatic case in 14 days, 129 (49.2) | |||||||
| Yang W [27] (Feb 27, 2020 | Zhejiang | Jan 17, 2020–Feb 10, 2020 | 149 | Stayed in Wuhan, 80 (53.7); stayed in provinces other than Wuhan 5 (3.4); contacted with people in Hubei, 49 (32.9); no relation with Hubei | 81 (54.4) | 45.11 (13.35)a | |
| Xu X [28] (Feb 28, 2020 | Guangdong | Jan 23, 2019–Feb 4, 2020 | 90 | Wuhan or infected patient | 39 (43) | 50 (18–86) | |
| Wu J [29] (Feb 29, 2020 | Jiangsu | Jan 22, 2020–Feb 14, 2020 | 80 | None | 39 (48.6) | 46.10 (15.42)a |
a
Mean (standard deviation); IQR, interquartile range.