Texas Health Data
Death Data

Death Tables (1999 - 2012)       Death Tables (1990 - 1998)      Death Maps (1990 - 1998)

The Underlying Cause of Death data available on Texas Health Data are county-level Texas mortality data. Data are based on a subset of variables collected on death certificates for Texas residents who died in Texas and out-of-state. Each death certificate identifies a single underlying cause of death that is defined as the disease or injury which initiated the train of events leading directly to death, or the circumstances of the accident or violence which produced the fatal injury.

Death data are available in two modules, one for the years 1990 through 1998 and one for the years 1999 and on. Two modules are necessary for death statistics because deaths occurring during 1990 through 1998 were coded using the Ninth Revision of the International Classification of Diseases (ICD-9) while deaths occurring since 1999 are coded using the Tenth Revision (ICD-10).

  • Changes in Cause of Death Coding for 1999 and later - For 1979-1998, causes of deaths were coded according the ICD-9. The ICD-10 revision was implemented for years 1999 and onward. ICD-10 represents a substantial change from ICD-9. The number of disease categories has expanded from ICD-9 and category names, coding rules and the National Center for Health Statistics (NCHS) cause-of-death lists for tabulating mortality statistics have changed. NCHS developed methods to facilitate comparisons between causes-of-deaths coded under ICD-9 and those coded under ICD-10 (comparability between ICD revisions). For the present, Texas Health Data provides mortality statistics for years 1999 and onward in a separate module. The user is cautioned against attempting analyses that involve combining or comparing data produced under the two different coding systems (see below for more information on comparisons between the two coding systems).
  • Cause of Death Selections - The choices for the cause of death available for both the ICD-9 and the ICD-10 systems are divided into three levels that are based on predefined lists developed by NCHS for the tabulation and dissemination of mortality data. For years 1999 and onward, the causes of death listed on the input screen comprise the first level and are the 50 categories eligible to be ranked as leading causes of death. The second level is more detailed and is based on the NCHS List of 113 Selected Causes of Death. The third level is a modified version of the NCHS List of 358 Selected Causes of Death. In order to obtain information from the more detailed second or third levels, the user must first select the broader category in the first level and then "drill down" to the second and third levels. In some cases, the level of detail does not change from the first level to the third level. In other cases the level of detail does not change from level one to level two but is more detailed in level three. A detailed searchable list of the three levels of data based on ICD-10 provides more information on the drill-downs.
    • For pre-1999 statistics, the drill-down lists are also based on modified NCHS tabulations, but with less detail.
  • Comparability Ratios - NCHS has developed comparability ratios to support comparisons between ICD-9 and ICD-10. Comparability ratios were derived by double-coding 1996 deaths using both systems and calculating the ratio of the number of deaths based on ICD-10 to the number based on ICD-9, for each specific cause. This analysis was carried out for the several NCHS lists of selected causes of death. The data used were at the national level and did not take into account differences due to age, race or geography. More detailed comparability ratios are currently under development that do reflect the effect of age, race and geography.
  • Age Adjustment - Age-adjusted death rates provide unbiased comparisons that are not influenced by differences in age distribution in subject populations. The standard used is the US 2000 standard population. Note: Age adjusted rates retrieved from this system after December 8, 2008 will be slightly different from those retrieved previously, because of a change in methodology. The differences will be small.

  • 2003 Death Certificate Revision - In 2003, HHS Secretary Tommy Thompson approved the revision to the U.S. Standard Certificates of Death and Fetal Death and encouraged all states to adopt them. The process involved in this revision, as well as details of what was revised, can be found at the National Vital Statistics System Web Site.
    • New Death Certificate for 2006 - Texas adopted the new U.S. Standard Certificates of Death and Fetal Death in 2006. Data users are cautioned that some data items might not be directly comparable with previous years.
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Last Updated June 10th, 2014