Fatal Injury Data
Year-to-year death data for a given state can sometimes be affected by unexpectedly large numbers of death certificates with the underlying cause coded as “other ill-defined and unspecified causes of mortality” (ICD-10 code R99). Large year-to-year variations in state-specific injury-related death counts and/or rates for any reporting category defined by external-cause-of-injury or diagnosis codes can be evaluated in the context of accompanying year-to-year variations in the counts of death records with R99 as the underlying cause code (this information can be obtained using CDC WONDER: http://wonder.cdc.gov). Data on poisoning-related deaths for several states (NJ, OH, WV) and the District of Columbia are believed to have been particularly affected for reporting year 2009. However, users should remain alert to the possibility that data for other injury reporting categories, states, and/or years could also be affected.
Note: The coding of mortality data changed significantly in 1999, so you may not be able to compare number of deaths and death rates from 1998 and before with data from 1999 and after. Also, cause-of-injury groupings were updated in 2003, which may affect some WISQARS mortality reports. Learn more >>
The National Center for Health Statistics (NCHS) in an agreement with the National Association of Public Health Statistics and Information Systems (NAPHSIS) has implemented a new, more restrictive rule for reporting National Vital Statistics System (NVSS) state- and county-level death data for years 2008 and later, in order to avoid inadvertent disclosure of cases. Therefore, the Office of Statistics and Programming, NCIPC has modified WISQARS to accommodate the new data suppression rule; i.e., no figure, including totals, should be less than 10 in tabulations for sub-national geographic areas, regardless of the number of years combined with the data from 2008 and later. Tabulations, charts, and maps produced by WISQARS using only NVSS death data for years prior to 2008 are not affected by this new rule.
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