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 ….. Non-responders received a personal reminder after 3 weeks.
Invited participants could fill in the questionnaire until ….

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

https://journals.sagepub.com/doi/10.1177/0261927X241287765

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