Exact(5)
The three sampling villages included in the study: Bozanta Mare (BM), Sasar (SA), and Recea (RC).
Census sampling targeting the entire livestock population of the two sampling sites was performed in July (Funyula site) and October (Butula site) 2004, by visiting all livestock keeping homesteads in all 19 sampling villages.
For the entomological studies, the number of sampling villages (N) was determined using the equation (N = p q N/(AE 2 N+p q) where p = proportion of households with mosquitoes (Because there was no previous information on the proportion of houses (p) with mosquitoes in the area, we estimated it to be 50%), q = 1−p, and the allowable error (AE) was set at 5%.
In the first stage of sampling, villages were enumerated and selected randomly with probabilities proportional to each village's population.
Annual incidence of NTD from 1998 to 2005 was recorded for each of the 326 sampling villages within Heshun County.
Similar(55)
In the second stage of sampling, village leaders led field teams to the village centre where a pen was spun to determine the field team's walking direction.
In total, we obtained 11 sample villages.
Finally, we obtained 11 sample villages.
The sampled villages consist of about 536 households.
Taro grown at the four sampled villages accumulated high concentrations of Zn, Pb and Cd.
In the second stage, four sample villages, one from each sample kebele, were selected randomly.
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