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Their study was the first to use the sociological sampling questionnaire survey method in China's intermarriage research.
The method of sampling, questionnaire design, training, physical examination, laboratory examinations, and data management have been centralized and standardized.
Epidemiology is a highly technical affair, requiring training and experience in sampling, questionnaire design, interviewing, and statistical analysis.
Further details of sampling, questionnaire and procedure can be found in the publicly available survey report [ 5].
Four items from a venous blood sampling questionnaire (VBSQ) (described below) were used to cover the outcome variables.
The sampling, questionnaire structure, and content of the NFHS surveys follow what has been adopted by the Demographic Health Surveys (DHS) in other developing countries.
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Measurements include blood sampling, questionnaires, anthropometrics (weight, height, waist and hip circumference), maximal cycle exercise test (VO2peak), DEXA-scan (body composition) and abdominal MRI (subcutaneous and visceral fat).
The compatibility value for the completed sample questionnaire for 0 < α < 1 in Mikhailov's model, is presented in Table 5.
On Tuesday, the White House provided a lengthy document explaining the purpose and rationale behind the surveys, as well as a sample questionnaire for schools to utilize.
A sample questionnaire item is "I find my circle of acquaintances too limited".
A sample questionnaire in English is available (see Additional file 1).
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