Table 1.

Space−time clusters with significant higher risk in Shandong Province, China, from 21 January 2020 to 1 March 2020

Cluster	Time frame	Location (county or district)	Cases	Expected	RR	P-value
Most likely	25 January 2020–10 February 2020	Huancui, Yanzhou, Luozhuang, Lanshan (Linyi), Decheng, Dongping, Mengyin, Ningyang, Taishan, Shizhong, Linzi, Xintai, Jvnan, Daiyue, Yishui, Jinxiang, Wendeng, Zhangdian, Changqing, Qufu, Licheng, Shizhong, Hengtai, Lixia, Tengzhou, Feixian, Dongying, Zhangqiu, Huaiyin, Hedong, Pingyin, Boshan, Tianqiao	180	59.51	3.99	<0.0001
Secondary	24 January 2020–10 February 2020	Laishan, Longkou, Fushan, Muping, Weicheng, Lanshan (Rizhao), Hanting, Rushan, Rongcheng, Qixia, Penglai, Laizhou, Donggang, Zichuan, Haiyang, Laiyang, Pingdu, Zhaoyuan, Laixi, Jiaozhou, Licang, Chengyang, Huangdao, Shibei, Jimo, Weishan, Rencheng, Linqu, Laoshan, Kuiwen, Changyi, Changle	154	53.82	3.57	<0.0001
2nd secondary	4 February 2020–8 February 2020	Dongchangfu	22	0.87	26.42	<0.0001

RR, Relative risk.