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NORMS Note to Users

Graphical depiction of the NORMS logo NIOSH may periodically revise NORMS and its associated query pages to maintain relevancy and currency of content. Users should be aware that these modifications may result in different output being generated and should consult the system history to obtain an understanding of changes and their implications. Comments concerning suggested improvements are welcomed. Please send comments and suggestions to the WoRLD e-mail address listed at the bottom of the Occupational Respiratory Disease Surveillance (ORDS) Home Page.

The data generated by NORMS are in the public domain and may be used without special permission; citation of the source, however is appreciated.

Suggested Citation

NIOSH [ year ]. National Occupational Respiratory Mortality System (NORMS). U.S. Department of Health and Human Services, Public Health Service, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, Respiratory Health Division, Surveillance Branch. <https://webappa.cdc.gov/ords/norms.html> Date accessed, _____.

System History (NORMS was originally posted in July, 2004)

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The following revisions were posted on March 22, 2006:

  1. Death counts based on the "Multiple Cause" option include the number of decedents with any mention of the selected diseases on the entity axis code field in all data years. "Contributing Cause" is the number of decedents with any mention of the selected diseases on the entity axis code field that are not coded as the "Underlying Cause." [Previously, death counts due to diseases in (pre-ICD-10) data years 1968-1998 included the number of decedents with any mention of the selected disease on the record axis code field.]
  2. Crude death rates and age-adjusted death rates generated prior to this date for data year 2000 may have changed. [Previously, population estimates in data year 2000 did not include American Indian or Alaska Native females. This was due to an error in the algorithm used to generate these population estimates, which has been corrected.] Please note that the standard population distributions for year 2000 are not affected by the change in population estimates.
  3. The National Database includes an option to count the number of decedents with unknown age at time of death. [Previously, death counts were restricted to decedents of known ages,15 years and older.]
  4. The term "mortality rate" has been replaced with the term "death rate." Death rates are typically based on mid-year population denominators, while mortality rate denominators are typically not population-based.

The following revisions were posted on August 18, 2008:

  1. Proportionate mortality ratios for underlying cause-of-death data generated prior to this date may have changed. [Previously, ICD-9 codes for the pneumoconioses and some ICD-9 codes for COPD, pneumonia, and tuberculosis were not included. This was due to an error in the algorithm used to generate these statistics, which has been corrected.]
  2. Deaths with J65 (Pneumoconiosis associated with tuberculosis) coded as a cause of death on the entity axis are included in the entity axis multiple cause-of-death tabulations for code J64 (Unspecified Pneumoconiosis) and codes A16, A19, or B90.9 (collectively defined as "Respiratory Tuberculosis"). [Previously, these deaths were not counted.]

The following revisions were posted on April 7, 2010:

  1. Due to a revision of the methodology used to determine life expectancy, which is described in https://www.cdc.gov/nchs/data/nvsr/nvsr58/nvsr58_10.pdf [PDF - 1,161KB], 2005 years of potential life lost (YPLL) to life-expectancy estimates have been revised. [Previously, these YPLLs were based on preliminary 2005 life-expectancy data that were obtained from https://www.cdc.gov/nchs/data/nvsr/nvsr56/nvsr56_10.pdf [PDF - 2,335KB].]
  2. YPLL to life expectancy for Whites, Blacks, Males, and Females are based on life-expectancy data specific to each of those demographic categories. [Previously, these YPLLs were based on life-expectancy data for the whole U.S. population.]

The following revisions were posted on August 24, 2012:

  1. Data are suppressed for each state/county in which there were less than 10 reported deaths in the queried time interval(s). [Previously, there was no state-level suppression, and data were suppressed for each county with less than three deaths.]
  2. To ensure that results conform to confidentiality requirements when more than one cause of death is simultaneously queried, results are suppressed for any queried causes of death that are associated with less than 10 decedents: in each state and each year after 2004; and in each county, in all combined years after 1988. [Previously, multiple causes of death were not suppressed in this manner.]
  3. Data are also suppressed where the number of years with reportable deaths is less than the total number of years in the queried time interval because data for those states/counties are incomplete and should not be used for among-state statistical comparisons. [Previously, state-level data were not suppressed in this manner because data were reported for all years in the queried time interval.] It should be noted, however, that a query of "Each Selected Year" may yield some state-level data that are suppressed when "All Selected Years (combined)" are queried.
  4. Starting with 2005 data, all of the data for all states are suppressed if only one state had less than 10 decedents in only one year. [Previously, data were not suppressed in this manner.]
  5. Due to a revision of the methodology used to determine life expectancy, which is described in https://www.cdc.gov/nchs/data/nvsr/nvsr58/nvsr58_10.pdf [PDF - 1,161KB], 2000-2004 years of potential life lost (YPLL) to life-expectancy estimates have been revised. [Previously, these YPLLs were based on life-expectancy data that were obtained from annual life tables published prior to the methodological revision.]
  6. Starting with 2006 data, life expectancy for Hispanic, Hispanic male, Hispanic female, Non-Hispanic white, Non-Hispanic white male, Non-Hispanic white female, Non-Hispanic black, Non-Hispanic black male, and Non-Hispanic black female categories are based on life-expectancy data specific to each of those demographic categories. [Previously, these YPLLs were based on life-expectancy data for the whole U.S. population.]
  7. NCHS bridged-race intercensal population estimates are now used for data years 1990-1999. [Previously, Postcensal Demo-Detail estimates were used for 1990-1995, and comparable postcensal estimates prepared by the BoC were used for 1996-1999.]
  8. For data years 2000-2007, the vintage 2008 bridged race postcensal population estimates of July 1, 2000 to July 1, 2008 are now being used. [Previously, the bridged-race vintage 2002 postcensal estimates were used for data years 2000-2002, the bridged-race vintage 2003 postcensal estimates were used for data year 2003, the bridged-race vintage 2004 postcensal estimates were used for data year 2004, the bridged-race vintage 2005 postcensal estimates were used for data year 2005, the bridged-race vintage 2006 postcensal estimates were used for data year 2006, and the bridged-race vintage 2007 postcensal estimates were used for data year 2007.]

The following revisions were posted on January 23, 2015:

  1. Crosswalks were developed by NIOSH Surveillance Branch for recoding multiple cause-of-death data from the Census 1990 Industry and Occupation Classification system to the Census 2000 Industry and Occupation Classification system using industry and occupation coding from death certificates that met NCHS quality criteria between 1985 and 1999 and industry and occupation coding from death certificates that were compiled by the NIOSH National Occupational Mortality Surveillance (NOMS) system, 2003, 2004 and 2007. The "Category Conversion Factor" for the redistribution of Census 1990 to Census 2000 Industry Classification System codes in Table 1 and the "Category Conversion Factor" for the redistribution of Census 1990 to Census 2000 Occupation Classification System codes in Table 2 of the U.S. Census Bureau Technical Paper #65 [PDF - 2.45MB] were used as a basis for reassigning Census 1990 industry and occupation codes to the most appropriate Census 2000 codes.
  2. Industry/Occupation Database and Job Names queries, based on the Census 2000 Classification System, were added.

The following revisions were posted on May 12, 2015:

  1. NCHS bridged-race intercensal population estimates are now used for data years 2000-2009. [Previously, the vintage 2008 bridged race postcensal population estimates of July 1, 2000 to July 1, 2008 were used for data years 2000-2008, and the vintage 2009 bridged race postcensal population estimate of July 1, 2009 was used for data year 2009.]
  2. The vintage 2013 bridged race postcensal population estimates of July 1, 2013 are now used for data year 2010. [Previously, the vintage 2010 bridged race postcensal population estimates of July 1, 2010 were used.]

The following revision was posted on March 16, 2016:

  1. The vintage 2014 bridged race postcensal population estimates of July 1, 2014 are now used for data years 2010-2013. [Previously, the vintage 2013 bridged race postcensal population estimates of July 1, 2013 were used.]

The following revision was posted on November 16, 2016:

  1. Number of decedents, years of potential life lost, and proportionate mortality ratios generated by Industry/Occupation Database II queries prior to this date may have changed. [Previously, approximately 14% of all white decedents and 19% of all black decedents in years 2003, 2004, and 2007 combined were incorrectly assigned to the "other" race category. This was due to an error in the algorithm used to assign race categories in those three years, which has been corrected.]

The following revisions were posted on June 6, 2017:

  1. The vintage 2015 bridged race postcensal population estimates of July 1, 2015 are now used for data years 2010-2014. [Previously, the vintage 2014 bridged race postcensal population estimates of July 1, 2014 were used.]
  2. Users attempting to link to either of the previous two Industry/Occupation Database pages are now redirected to the Industry/Occupation Database page, and users attempting to link to either of the previous two Job Names pages are now redirected to Job Names page. [The Industry/Occupation Database I and Job Names I pages were removed, and the Industry/Occupation Database II and Job Names II pages were renamed.]
  3. Age-adjusted death rates for queries with age-limit categories other than "Ages 0 and Older" and "Ages 15 and Older" may have changed. [Previously, the standard population estimates were disproportionately applied except in those age-limit categories. Specifically, age-specific death rates were weighted using the standard-million "Ages 0 and Older" population distribution whenever the selected lower age limit was zero, and age-specific death rates were weighted using the working-age population distribution of "Ages 15 and Older" whenever the selected lower age limit was greater than zero, regardless of which upper age limit was selected.]

The following revisions were posted on June 20, 2017:

  1. Although query results continue to be reported by state of residence, industry and occupation codes from participating states (and years) are now compiled from the participating states of occurrence in which the deaths were reported. [Previously, industry and occupation codes were compiled from the decedents' participating states of residence.]

The following revisions were posted on May 16, 2018:

  1. The vintage 2016 bridged race postcensal population estimates of July 1, 2016 are now used for data years 2010-2015. [Previously, the vintage 2015 bridged race postcensal population estimates of July 1, 2015 were used.]
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