This is the primary repository for the Nordic Dizziness Questionnaire (NDQ), including the original versions in Norwegian, Danish and Swedish. It is also intended as a repository for any subsequent support documentation and questionnaire modifications or versions. Project and funding The questionnaire was developed as part of the Öre-sund Project, which was co-funded by the European Union (EU Interreg), Haukeland University Hospital (Norway), Zealand University Hospital (Denmark), and Skåne University Hospital (Sweden). License The questionnaire is published under Creative Commons Attribution 4.0 International (CC BY 4.0). Free use, sharing, and adaptation are permitted provided that correct attribution is given, including reference to DOI: 10.5281/zenodo.19133087 Citation Goplen FK, Berge JE, Magnusson M, Karlberg M, Tjernström F, Grønlund C, Djurhuus BD (2026). Nordic Dizziness Questionnaire. Zenodo DOI: 10.5281/zenodo.19133087 Versions NDQ_nb (Norwegian / norsk bokmål) NDQ_da (Danish / dansk) NDQ_sv (Swedish / svenska) Contact persons Norwegian version (norsk bokmål) Frederik Kragerud Goplen, Department of Otorhinolaryngology, Head and Neck Surgery, Haukeland University Hospital, N-5021 Bergen, Norway Danish version (dansk) Bjarki Ditlev Djurhuus, Department of Otorhinolaryngology and Maxillofacial Surgery, Zealand University Hospital, 4600 Køge, Denmark Swedish version (svenska) Fredrik Tjernström, Department of Oto-Rhino-Laryngology, Head and Neck Surgery, Skåne University Hospital, SE-221 85 Lund, Sweden