BACKGROUND Differences in the characteristics of respondents and nonrespondents to a survey can be a cause of selection bias. The aim of this study was to determine the sociodemographic and lifestyle characteristics of respondents to a field-based accelerometry survey. METHODS A cross-sectional mail survey was sent to 4000 adults (50% male; age 20 to 69 years) who were randomly selected from ...

Online social networks are getting lots of attentions from the research communities since they are rich sources of data to learn about the members of our society as well as the relationship among them. With the advances of Internet related technologies, online surveys are established as an essential tool for a wide range of applications. One significant issue of online survey is how to select a...

Enabling respondents to obtain clarification about the intended meaning of survey questions can dramatically improve response accuracy. However, respondents often do not recognize that their conceptions of terms in a question can differ from the question author's conception. As a result they do not request clarification on many occasions when it could improve their understanding and, thus, the ...

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