Public use data file documentation : Linked birth/infant death data set : 1991 birth cohort
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Public use data file documentation : Linked birth/infant death data set : 1991 birth cohort

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      The Linked Birth/Infant Death Data Set, 1991 Birth Cohort consists of three separate data files. The first file includes linked records of live births and infant deaths for the 1991 birth cohort -- also referred to as the numerator file. The second file is the live birth file for 1991, with a few minor modifications -- referred to as the denominator-plus file. The files are offered as a numerator/denominator data set to give users the means to compute infant mortality rates. The third file contains information from the death certificate for all infant death records which could not be linked to their corresponding birth certificates -- referred to as the unlinked death file. The 1991 linked file is comprised of deaths to infants born in 1991 who died in 1991 or 1992 before their first birthday. Infant death records were extracted from the 1991 and 1992 National Center for Health Statistics (NCHS) mortality statistical files. Linked birth records were extracted from a denominator file that contained the 1991 NCHS natality statistical file and a small number of late-filed birth certificates. Refer to the Methodology section for a more detailed explanation of records added to the statistical file. The denominator file is not identical with the NCHS natality statistical file. The linked file of live births and infant deaths includes linked records for births and deaths that occurred in the United States to U.S. residents and to U.S. nonresidents. Excluded are deaths that occurred outside the United States to infants born in the Us.; deaths that occurred in the United States to foreign-born infants; and births and deaths that occurred outside the United States to U.S. residents. LinkCO91Guide.pdf
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