Table 2.
The clusters of P. falciparum cases detected using the purely spatial clustering in 2011–2017, Myanmar
| Year | Cluster type | Cluster areas (n) | Observed | Expected | RR | Radius (km) | LLR | P value |
|---|---|---|---|---|---|---|---|---|
| 2011 | A | 19 | 82,306 | 16,321.67 | 6.07 | 193.69 | 73,093.61 | 0.000 |
| B | 37 | 96,774 | 30,464.18 | 3.86 | 301.82 | 51,754.42 | 0.000 | |
| 2012 | A | 17 | 50,982 | 9558.10 | 6.42 | 134.74 | 47,658.75 | 0.000 |
| B | 51 | 74,841 | 26,736.30 | 3.55 | 458.53 | 34,438.70 | 0.000 | |
| 2013 | A | 16 | 40,162 | 6330.15 | 7.98 | 128.30 | 44,093.98 | 0.000 |
| B | 31 | 40,085 | 11,314.10 | 4.32 | 274.45 | 24,683.83 | 0.000 | |
| 2014 | A | 15 | 33,491 | 3736.28 | 12.73 | 126.67 | 48,613.24 | 0.000 |
| B | 31 | 27,116 | 6868.33 | 4.98 | 274.45 | 19,255.70 | 0.000 | |
| 2015 | A | 1 | 6972 | 106.48 | 74.80 | 0 | 22,736.04 | 0.000 |
| B | 31 | 14,535 | 3633.68 | 5.07 | 274.45 | 10,492.98 | 0.000 | |
| B | 1 | 4288 | 356.01 | 12.98 | 0 | 6883.72 | 0.000 | |
| B | 2 | 1278 | 196.47 | 6.64 | 44.97 | 1322.27 | 0.000 | |
| 2016 | A | 1 | 4135 | 50.73 | 96.54 | 0 | 14,448.37 | 0.000 |
| B | 21 | 6987 | 1411.46 | 6.38 | 184.96 | 6277.35 | 0.000 | |
| B | 1 | 669 | 62.58 | 10.94 | 0 | 985.75 | 0.000 | |
| 2017 | A | 1 | 13,016 | 42.98 | 407.00 | 0 | 63,212.89 | 0.000 |
| B | 3 | 6001 | 347.99 | 19.42 | 59.06 | 11,764.61 | 0.000 | |
| B | 2 | 3497 | 180.67 | 20.71 | 44.97 | 7156.41 | 0.000 |
Type, A: type of most likely cluster and B: second most likely cluster; n: the cluster number of township was identified by Kulldorff’s spatial scan; RR: relative risk; LLR: log likelihood ratio