Young Lifelines participants (13-17 years old) participating in general assessment 2A filled in a digital questionnaire about themselves (n = ~2,600).
The 2A Youth Questionnaire was followed by 2A Visit 1, on average within xx days (+/- yy days).
The 2A Youth Questionnaire is procedurally equivalent to the 1A Youth Questionnaire.

The 2A Youth Questionnaire contained the following sections and subsections:

• Education
• Family composition
• Household composition
• Personal data
• Employment status

• Acne
• Allergies
• Asthma & Allergies (ISAAC)
• Cold/Flu
• Digestive symptoms
• Ear conditions
• Eye conditions (general)
• Fatigue (general)
• Fatigue (PROMIS)
• Insomnia
• Kidney & bladder diseases
• Musculoskeletal symptoms
• Neurological disorders
• Respiratory problems (general)
• Skin conditions

• Alcohol use
• Drug use
• Electronic device use
• Exposure to smoking
• Hobbies & activities
• Pets & livestock
• Physical activity (sports)
• Sleep (general)
• Chronotype (MCTQ)
• Smoking & tobacco use

• Medication

• Rearing style (EMBU)
• Learning difficulties
• Social functioning (general)
• Social functioning (PROMIS)
• Stress (general)
• Youth Self Report (YSR)

• Children's diet (general)

• Physical development

• Subjective health (general)