This chapter sets out the core questionnaires used in the IDEFICS and I.Family studies. Since the IDEFICS study looked at younger children, it used a single questionnaire which was filled out by the parents. This focussed mainly on the child but also included some questions about the family, such as socioeconomic status. The I.Family study looked at the whole family, including children who were now old enough to answer questions on their own behalf. It therefore used a wider range of questionnaires, which this chapter outlines.
The development of instruments, the baseline data collection and the first follow-up work as part of the IDEFICS study (www.idefics.eu) were financially supported by the European Commission within the Sixth RTD Framework Programme Contract No. 016181 (FOOD). The most recent follow-up including the development of new instruments and the adaptation of previously used instruments was conducted in the framework of the I.Family study (www.ifamilystudy.eu) which was funded by the European Commission within the Seventh RTD Framework Programme Contract No. 266044 (KBBE 2010-14).
We thank all families for participating in the extensive examinations of the IDEFICS and I.Family studies. We are also grateful for the support from school boards, headmasters and communities.
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