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The profile is designed to explain the content to users and allow them to map their content to DDI. An XML DDI profile is also available. DDI terminology is used here. The content has been broken into separate tables for ease of reading. Colours are used to make it clearer what level each item is at and how it sits within other items.

Note you will see that Data Collection and Questionnaire are separate items. The Questionnaire refers to just the questionnaire itself. The Data Collection refers to the use of the questionnaire i.e. when it was used, who did the data collection, etc.