DIR Jahrbuch 2021 (Deutsches IVF-Register Annual Report 2021)

Annual report (Jahrbuch) of the Deutsches IVF-Register (DIR) for treatment year 2021. DIR is the German national IVF/ICSI registry, founded 1982 — the oldest continuously operating ART registry. Voluntary professional-society database with high de-facto coverage of German fertility centres. Reports cycles, transfers, pregnancies and clinical outcomes by treatment type (IVF, ICSI, frozen embryo transfer, donor). German-language registry document. Used as a Phase B historical-archive source for the ART Registry Comparison study (cross-registry classification by reporting completeness on 7 framework dimensions).