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Young participants (13-17y) participating in baseline assessment 1A filled in a digital questionnaire at the location of 1A Visit 1 (n = ~3,900).
The 1A Youth Questionnaire is procedurally equivalent to the 2A Youth Questionnaire.
Note that for most participants of 13-17 years old, parents also filled in the 1A Child questionnaire.
The 1A Youth Questionnaire contained the following sections and subsections: