Table 4.
Spatiotemporal clusters of COVID-19 cases in mainland China from January 15 to February 25, 2020
| Type | Time frame | Coordinates/radius | N | Cases | Expected | Relative risk | P-value |
|---|---|---|---|---|---|---|---|
| Most likely | 2020/1/29–2020/2/18 | (30.52 N, 114.31 E) 160.56 km | 10 | 37309 | 748.41 | 125.17 | 0.001 |
| Secondary | 2020/1/30–2020/2/8 | (30.78 N, 106.08 E) 597.91 km | 54 | 3957 | 2385.55 | 1.70 | 0.001 |
| 2nd secondary | 2020/1/31–2020/2/20 | (35.38 N, 116.59 E) 0 km | 1 | 201 | 8.74 | 23.06 | 0.001 |
| 3rd secondary | 2020/1/29–2020/2/5 | (22.62 N, 114.07 E) /0 km | 1 | 251 | 109.18 | 2.30 | 0.001 |
| 4th secondary | 2020/1/28–2020/1/30 | (29.86 N, 121.56 E) 223.82 km | 12 | 439 | 283.25 | 1.55 | 0.001 |
| 5th secondary | 2020/2/4–2020/2/12 | (18.25 N, 109.50 E) 0 km | 1 | 36 | 7.30 | 4.94 | 0.001 |
| 6th secondary | 2020/2/5–2020/2/6 | (45.77 N, 131.02 E) 98.47 km | 3 | 38 | 8.20 | 4.64 | 0.001 |
| 7th secondary | 2020/1/30–2020/2/6 | (23.16 N, 113.23 E) 0 km | 1 | 205 | 124.92 | 1.64 | 0.001 |