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The first step comprised a purposeful selection of districts to capture an adequate representation of the province.
In this study, we were able to collect drug samples from major and non-major trading centres in a probability-based selection of districts across mainland Tanzania by joining forces with a separate study on bednets.
Therefore, the selection of districts is purposive and not random.
The selection of districts was done in consultation with UNICEF State teams.
Sampling procedure was multistage and random for selection of districts, wards, villages, hamlets, and then households.
The data collectors were not blinded to the selection of districts.
Similar(45)
This could indicate a self-selection of districts where the DTLC is more conscientious and provide better services, even though there is no evidence for this potential bias.
This study used a cross-sectional, multi-stage sampling design in which two urban cities were first pre-selected (Stage 1), followed by the selection of residential districts within each city (Stage 2), identification of blocks of apartment buildings within each district (Stage 3), and sampling households within each block of buildings (Stage 4).
To ensure the random selection of the districts, each of the 29 administrative health districts was assigned a number from 1 to 29 against its name, arranged in alphabetical order.
The selection of the districts was made on the account that the two districts represent agro-pastoral communities where crop farming is widely practiced.
In the case of SARS in China, where entire residential districts were cordoned off for weeks at the height of the outbreak, the selection of such districts for quarantine could have been better informed by these ellipses indicating directional bias and associated physical distance in disease transmission.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com