Table 3.

Spatio-temporal cluster results on BD incidence at county level, 2011–2019

Year	Cluster	Cluster areas	Cluster center/radius (km)	Cluster time	RR	LLR	P value
2011	Most likely cluster	34	(27.69 N, 101.38 E)/253.85	2011/4/1 to 2011/9/30	9.36	4307.35	< 0.0001
	Secondary cluster	12	(32.00 N, 101.97 E)/149.81	2011/4/1 to 2011/9/30	8.59	548.74	< 0.0001
	2nd secondary cluster	6	(30.59 N, 104.02 E)/16.86	2011/4/1 to 2011/9/30	2.59	246.70	< 0.0001
2012	Most likely cluster	42	(28.42 N, 100.85 E)/280.99	2012/4/1 to 2012/9/30	7.93	3133.91	< 0.0001
	Secondary cluster	13	(32.58 N, 102.59 E)/163.64	2012/3/1 to 2012/8/31	6.06	288.83	< 0.0001
	2nd secondary cluster	7	(30.61 N, 104.11 E)/20.15	2012/4/1 to 2012/9/30	2.36	172.56	< 0.0001
2013	Most likely cluster	55	(28.68 N, 99.34 E)/417.29	2013/3/1 to 2013/8/31	7.75	3003.06	< 0.0001
	Secondary cluster	4	(33.68 N, 102.90 E)/126.37	2013/7/1 to 2013/12/31	11.18	227.52	< 0.0001
	2nd secondary cluster	1	(30.07 N, 104.74 E)/0.00	2013/4/1 to 2013/4/30	12.49	182.34	< 0.0001
2014	Most likely cluster	55	(28.68 N, 99.34 E)/417.29	2014/4/1 to 2014/9/30	6.95	1952.17	< 0.0001
	Secondary cluster	7	(32.24 N, 103.04 E)/113.85	2014/6/1 to 2014/11/30	7.54	163.73	< 0.0001
	2nd secondary cluster	7	(30.73 N, 104.04 E)/19.23	2014/4/1 to 2014/9/30	2.14	87.08	< 0.0001
2015	Most likely cluster	54	(28.68 N, 99.34 E)/412.13	2015/4/1 to 2015/9/30	6.55	1557.76	< 0.0001
	Secondary cluster	4	(33.68 N, 102.90 E)/126.37	2015/7/1 to 2015/12/31	15.43	275.54	< 0.0001
	2nd secondary cluster	5	(29.39 N, 104.85 E)/20.85	2015/6/1 to 2015/10/31	3.28	87.18	< 0.0001
2016	Most likely cluster	54	(28.68 N, 99.34 E)/412.13	2016/4/1 to 2016/9/30	7.00	1620.57	< 0.0001
	Secondary cluster	9	(32.63 N, 103.45 E)/127.80	2016/4/1 to 2016/9/30	5.20	126.32	< 0.0001
	2nd secondary cluster	3	(29.39 N, 104.85 E)/18.29	2016/4/1 to 2016/9/30	3.86	84.39	< 0.0001
2017	Most likely cluster	55	(28.68 N, 99.34 E)/417.29	2017/4/1 to 2017/9/30	7.96	1884.31	< 0.0001
	Secondary cluster	9	(32.63 N, 103.45 E)/127.80	2017/5/1 to 2017/10/31	4.76	103.72	< 0.0001
	2nd secondary cluster	3	(29.39 N, 104.85 E)/18.29	2017/5/1 to 2017/10/31	3.16	59.54	< 0.0001
2018	Most likely cluster	54	(28.68 N, 99.34 E)/412.13	2018/3/1 to 2018/8/31	5.94	1086.65	< 0.0001
	Secondary cluster	4	(33.68 N, 102.90 E)/126.37	2018/6/1 to 2018/11/30	16.60	243.28	< 0.0001
	2nd secondary cluster	1	(30.41 N, 105.42 E)/0.00	2018/5/1 to 2018/10/31	9.04	207.74	< 0.0001
2019	Most likely cluster	24	(26.95 N, 101.97 E)/250.58	2019/5/1 to 2019/10/31	10.76	1963.02	< 0.0001
	Secondary cluster	13	(32.58 N, 102.59 E)/163.64	2019/4/1 to 2019/9/30	11.90	485.82	< 0.0001
	2nd secondary cluster	1	(30.41 N, 105.42 E)/0.00	2019/5/1 to 2019/10/31	7.62	165.76	< 0.0001