Table 1. Demographic distribution of the target population and the study sample.
| Number selected | Included in the study | % Included in the study | χ2 p-value | ||
| Sex | |||||
| Male | 2143 | 1435 | 67.0 | ||
| Female | 2151 | 1405 | 65.3 | 0.255 | |
| Age (months) | |||||
| 3–23 | 1588 | 1023 | 64.4 | ||
| 24–41 | 1324 | 886 | 66.9 | ||
| 42–59 | 1382 | 931 | 67.4 | 0.184 | |
| Location of residence | |||||
| Banda ra salama | 145 | 99 | 68.3 | ||
| Chasimba | 275 | 208 | 75.6 | ||
| Gede | 168 | 138 | 82.1 | ||
| Jaribuni | 71 | 45 | 63.4 | ||
| Junju | 470 | 280 | 59.6 | ||
| Kauma | 128 | 102 | 79.7 | ||
| Kilifi Township | 580 | 293 | 50.5 | ||
| Matsangoni | 341 | 240 | 70.4 | ||
| Mtwapa | 168 | 132 | 78.6 | ||
| Ngerenya | 329 | 249 | 75.7 | ||
| Roka | 381 | 253 | 66.4 | ||
| Sokoke | 208 | 136 | 65.4 | ||
| Takaungu-Mavueni | 380 | 244 | 64.2 | ||
| Tezo | 399 | 245 | 61.4 | ||
| Ziani | 251 | 176 | 70.1 | <0.0005 | |
| Month of sampling | |||||
| Jan | 308 | 216 | 70.1 | ||
| Feb | 409 | 278 | 68.0 | ||
| Mar | 392 | 225 | 57.4 | ||
| Apr | 347 | 220 | 63.4 | ||
| May | 529 | 278 | 52.6 | ||
| Jun | 458 | 283 | 61.8 | ||
| Jul | 353 | 271 | 76.8 | ||
| Aug | 155 | 118 | 76.1 | ||
| Sep | 300 | 178 | 59.3 | ||
| Oct | 435 | 326 | 74.9 | ||
| Nov | 494 | 337 | 68.2 | ||
| Dec | 114 | 110 | 96.5 | <0.0005 | |
| Total | 4294 | 2840 | 66.1 | ||