• Child abuse & neglect · Sep 2001

    The Zipper: a method for using personal identifiers to link data while preserving confidentiality.

    • R L Kruse, B G Ewigman, and G C Tremblay.
    • Center for Family Medicine Science in the Department of Family and Community Medicine, School of Medicine, University of Missouri-Columbia, 65212, USA.
    • Child Abuse Negl. 2001 Sep 1; 25 (9): 1241-8.

    ObjectiveThis report describes a method for linking separate confidential data sets that contain personal identifying information while preserving required anonymity.MethodsResearch data were linked with child abuse and neglect (CAN) report data by an independent "safe" analyst using an identical set of unique identifier codes assigned to each case in both data sets after all personal identifiers had been removed.ResultsThe research team never learned CAN report status of individuals, the state agency never saw the research data, and the desired analyses were completed using the merged data set.ConclusionsThe method was successfully used to merge data from separate sources without divulging confidential information.

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