Table 2.

Space clusters of COVID-19 cases in mainland China from January 15 to February 25, 2020

Type	Location	Cases	Expected	Relative risk	P-value
Most likely	Wuhan City, Huanggang City, Ezhou City, Xianning City, Huangshi City, Xiantao City, Qianjiang City, Tianmen City, Xiaogan City, Suizhou City	43,503	1496.82	96.87	0.001
Secondary	Shennongjia forestry district, Shiyan City, Yichang City, Xiangyang City, Jingmen City, Ankang City, Enshi City, Jingzhou City	5158	1224.16	4.51	0.001
2nd secondary	Xinyu City	130	52.22	2.49	0.001
3rd secondary	Wenzhou City	504	407.01	1.24	0.01