The survey was conducted using **telephone CATI interviews** (LINK Institute, Zurich).
A **sample of 2501 people** was interviewed. The population comprised all persons with Swiss citizenship, resident and registered for at least one year in the city of Zurich (at the time of sampling), residence permit or residence permit B. Also included weekly residents.
As an interview language, German, Italian, Spanish, Serbian-Croatian-Bosnian, Portuguese or English were offered.
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