Table 2.

Spatial analysis scanning for clusters with high rates using the discrete Poisson model by Kulldorff’s spatial scan statistic

Year	No. of clusters	Most likely cluster
		No. of villages	Radius (km)	No. of cases	Expected no. of cases	RRa	LLRb	P-value
2009	15	51	19.14	626	82.75	12.99	857.21	< 0.001
2010	11	85	27.78	887	157.08	11.56	1036.11	< 0.001
2011	8	91	28.72	598	122.57	9.97	622.09	< 0.001
2012	8	150	33.63	111	45.74	3.25	42.19	< 0.001
2013	3	79	23.65	185	32.81	9.91	206.70	< 0.001
2014	3	25	12.06	31	2.24	20.06	57.70	< 0.001

^aRelative risk

^bLog likelihood ratio