RELQ is the name of an additional questionnaire on regional language use among adult Lifelines participants. Implementation of this questionnaire in Lifelines was initiated by the department of information science of the University of Groningen.

All invitations were sent in september 2023. Non-responders received a personal reminder after 3 weeks.
Invited participants could fill in the questionnaire until december 2023.

~3,800 adolescents were invited for OPBQ.
The response rate in this age group was 15% (n=~600).

~123,000 adults were invited for OPBQ
The response rate in this age group was 33% (n=~40,000).

The OPB questionnaire consisted of four instruments:

• The Life Orientation Test (LOT-R), revised version
• The Parental Bonding Instrument (PBI) (+ parental optimism)
• The Cognitive Emotion Regulation Questionnaire (CERQ)
• The Responses to positive affect (RPA) questionnaire