Fig. 4

Frequency of cluster occurrence in the period 2009–2014. a Frequencies of occurrence of spatial clusters detected by two methods out of the three (Moran’s I (Anselin), SaTScan and Flexible scan statistics) each year. b Frequencies of occurrence of spatial clusters detected by all three methods. There were 116, 47, 34, 20 high-risk villages (detected by two of the methods) observed one to four times, respectively. For the clusters detected by all three methods, there were 77, 72, 45 strong-evidence high-risk villages detected one to three times, respectively