Measurement bias: standardization and calibration weight and measure before investigation, select Japanese electronic scales TANITA 100g tolerance levels, measure levels Microtoise UNICEF 1mm tolerance levels. Guide for investigators using the tool, how to interview questionnaire.
Deviation reminisce / recall: mainly minimized by asking questions related to the recent past, or the habits of children to the object to be investigated can be easily recalled.
Explain clearly the purpose of research for the study subjects.
instructions on how to answer specific content of each of the survey questions explicitly.
Set design the right questions, obviously.
surveys try (10 subjects) to check the fit and adjustment to the questionnaire.
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