Their study was the first to use the sociological sampling questionnaire survey method in China's intermarriage research.
Four items from a venous blood sampling questionnaire (VBSQ) (described below) were used to cover the outcome variables.
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].
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.
Table 1 Datasets' characteristics Dataset # samples (Questionnaires) # samples in the training set # samples in the test set # parties modelled Cypriot 1,897 1,138 759 7 German 5,180 3,108 2,072 7 Greek 26,243 15,746 10,497 9.
We received an additional 566 (9.1% of the original random sample) questionnaires by mail.
At 28 weeks gestation, all baseline clinical assessments, blood tests, stool samples, questionnaires and an updated medical history will be repeated.
40 To help their memory, interview participants received blank sample questionnaires similar to the ones they had filled out during their RCT participation.
