Adult and elderly Lifelines participants participating in second assessment 2A received two questionnaires, 2A Questionnaire 1 and 2A Questionnaire 2.
2A Q2 was followed by 2A Visit 2, on average within xx days (+/- yy days).
2A Q2 was followed up by assessment 2B, on average within xx months (+/1 yy months).
2A Q2 is procedurally equivalent to 1A Questionnaire 2 and 3A Questionnaire 2.
The average time between 1A Questionnaire 2 and 2A Q2 was xx months (+/- yy months).

N=xxx participants filled in a paper variant of 2A Q2, N=yyy participants filled in a digital variant of 2A Q2.

2A Q2 contained the following sections and subsections:

• Education
• Family composition
• Household composition
• Personal data
• Profession (self-reported)
• Employment status

• Allergies
• Chronic Fatigue Syndrome (CDC)
• Eye conditions
• Fatigue (general)
• Fatigue (CIS)
• Musculoskeletal symptoms
• Pain (WPI)
• Respiratory problems (ELON)

• Drug use
• Home environment (general)
• Informal care
• Physical activity (SQUASH)
• Smoking & tobacco use

• Macronutrients (FFQ-h) - Alcohol use

• Hair
• Digestive system (ROME)