Table 5. Purely spatial scan statistics of the most likely cluster and secondary clusters of malaria episodes at the household level, southern-central Ethiopia, October 2014 to January 2017.
| Clusters | # locations | Coordinates | Radius (km) |
Pop. | # episodes | Expected cases | Annual episodes per 1000 | RR | LLR | P-value |
|---|---|---|---|---|---|---|---|---|---|---|
| All malaria types* | ||||||||||
| Most likely | 330 | 8.0175 N, 38.7262 E | 1.5 | 1881 | 254 | 64.4 | 57.8 | 4.75 | 176.0 | <0.001 |
| Secondary | 412 | 7.8606 N, 38.7213 E | 2.2 | 2515 | 220 | 86.1 | 37.4 | 2.91 | 81.0 | <0.001 |
| Secondary | 31 | 7.893 N, 38.6914 E | 0.4 | 189 | 32 | 6.5 | 72.4 | 5.05 | 25.9 | <0.001 |
| Secondary | 5 | 7.9122 N, 38.6949 E | 0.2 | 26 | 10 | 0.9 | 164.5 | 11.32 | 15.1 | <0.001 |
| Secondary | 123 | 7.9937 N, 38.7173 E | 0.9 | 680 | 50 | 23.3 | 31.5 | 2.20 | 11.8 | 0.017 |
| Secondary | 28 | 7.954 N, 38.7132 E | 0.2 | 225 | 24 | 7.7 | 45.6 | 3.16 | 11.1 | 0.027 |
| Plasmodium falciparum | ||||||||||
| Most likely | 146 | 8.0232 N, 38.7161 E | 1.0 | 828 | 120 | 15.6 | 62.0 | 9.19 | 149.3 | <0.001 |
| Secondary | 443 | 7.8629 N, 38.7339 E | 1.9 | 2716 | 136 | 51.3 | 21.4 | 3.09 | 54.2 | <0.001 |
| Secondary | 7 | 7.9118 N, 38.6952 E | 0.2 | 42 | 12 | 0.8 | 122.2 | 15.40 | 21.5 | <0.001 |
| Plasmodium vivax | ||||||||||
| Most likely | 156 | 8.0052 N, 38.7247 E | 1.0 | 847 | 38 | 7.3 | 19.2 | 5.79 | 33.5 | <0.001 |
| Secondary | 28 | 7.8927 N, 38.6914 E | 0.4 | 174 | 19 | 1.5 | 46.7 | 13.41 | 31.2 | <0.001 |
| Secondary | 187 | 7.8616 N, 38.7307 E | 0.7 | 1174 | 40 | 10.2 | 14.6 | 4.39 | 26.6 | <0.001 |
* Plasmodium falciparum, Plasmodium vivax, or mixed, RR = Relative risk, LLR = Log likelihood ratio