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This cohort was selected through multistage area probability sampling of selected counties, blocks, and households, ensuring that the results could be generalizable to ∼500,000 older Mexican Americans.
This resulted in the exclusion of selected counties in Seattle/Puget Sound from incidence rate calculations for each of the API groups, with the exception of Filipinos (Table 1).
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The survey was carried out in kindergartens, preschools and community centres of the selected counties of the 2 districts.
In each of the selected counties, three towns were randomly selected, from each of which two villages were randomly selected.
From each of the selected counties, seven villages were randomly chosen.
The names, province, and economic development statuses of the selected counties are shown in Table 1.
Four of the selected counties, namely, Wenchuan, Qingchuan, Mianzhu and Dujiangyan, were hard-hit areas during the Wenchuan earthquake in 2008.
All kindergartens and preschools (which provide early childhood education) in the town and villages of the selected counties were invited to join this survey.
I determined acreage for the different classes of wheat in the selected counties of the four states for 1970 1979.
Then, by a systematic sampling approach, we randomly sampled 50% of townships in the selected counties, 50% of villages in the selected townships, and 50% of households in the selected villages.
Characteristics of the 152 selected counties distributed over three groups based on tertiles of the counties' wheat percentage are presented in Table 1.
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