[b[General information for data users]b] The Recruitment 2018 Part 1 dataset contains the following identifiers and study specific information: • [i[id_g]i] - Unique ID, GIP • [i[hhid_g]i] - Household identifyer, GIP • [i[pid]i] - Person identifyer (within HH) • [i[dDatum]i] - Interview-Datum • [i[mode]i] - Participation Mode Recruitment Part 1 • [i[recruitment_group_2018]i] - Gruppen Registrierung 2018 [u[Please note:]u] the documentation of the recruitment questionnaires is available in German language only.