Blinding
RECRUITMENT
The practice staff are blinded during the recruitment process while inviting patients to the study. Once patients return the completed questionnaires, the practice staff are no longer blinded.The patients are not aware of their group assignment, as they have no knowledge of the existence of two groups. Unblinding the control group is not intended. Participants in the intervention group are aware of the intervention when they are informed about the result of the "check-up 45 + " after evaluation of the "screening 45 + ". The project coordinators at the German Pension Insurance have no knowledge of the group assignment. The Charité study staff who perform the analyses know the group assignment.