Abstract
Introduction: The establishing of three Danish population-based registers, namely the Fertility Database, the Register of Legally Induced Abortions, and the In Vitro Fertilisation register, aimed at providing data for surveying of reproductive outcome. Content: The registers include information on births, abortions, and assisted reproduction as well as selected characteristics of the women (and men) involved. Validity and coverage: Both the validity and coverage of each register are considered of high quality. Conclusion: These registers provide, both individually and in combination, unique opportunities for undertaking detailed and comprehensive research in the field of reproduction.

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