Adult and elderly Lifelines participants participating in the fourth general assessment 4A receive 9 (age 18-64) or 10 (age 65+) short digital questionnaires (± 10 min. each). Questionnaires are sent out in a random order. The first questionnaire is sent 1 week prior to 4A Visit 1. Subsequently, one questionnaire will be sent every 5 days.

The transition towards multiple short questionnaires means a deviation in procedure in comparison to the previous general assessments. However, the questions asked within these short questionnaires are mostly identical to those asked in previous general assessments.

The ten 4A Questionnaires each have their own topic, and contain the following sections and subsections:

• General
• Activity
• Health 1
• Health 2
• Health 3
• Medication
• Substance use
• Sleep
• Food
• Elderly