Alzheimer's Disease and Related Dementia (ADRD) Mortality Definitions

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Definitions
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Presentation Information

All numbers and rates pertain to the place of residence (not occurrence).

If an Age group, Race, Sex, Ethnicity or Education Level are chosen, all rates/percentages include only the choices in both the numerator and denominator.

Maps are used to emphasize the spatial distribution of one or more geographic attributes or variables. This site generates choropleth maps as thematic maps in which the geographies are shaded different colors to represent different magnitudes of a variable.
The map projection is Lambert Conformal Conic.

Confidentiality rule:: Numbers based on 0-4 events are classified as a separate static class when a sub-county level geography (Census Tract or County Commission District) is chosen. This, in addition to offering only non-overlapping 5-year aggregates is done to assure confidentiality.
Not Reportable: At the County level or higher rates (and percents) based on 1-4 events are not reported due to statistical reliability reasons. At sub-county level (Census Tract or County Commission District), rates and percents based on 0-4 are not reported. This assures confidentiality.
Trendable Maps: Trendable maps are a series of choropleth maps showing change in spatial distribution of data in a selected area over selected period of time. Trendable maps share the same data class breaks which allows easy comparison between each map in the series.

Mapping Units:

County to create a map of a selected geography: counties, Public Health District(s) or Perinatal Region(s); or
Public Health District to create a map of the state by the 18 Public Health Districts; or
Perinatal Region to create a map of the state by the 6 Perinatal Regions; or
County Commission District or Census Tract to create a map of a selected geography: counties, Public Health District(s) or Perinatal Region(s)

Visible Layers:

Census Tracts 2020: Census Tracts are small, relatively permanent statistical subdivisions of a county or equivalent entity that are updated by local participants prior to each decennial census.; Census tracts generally have a population size between 1,200 and 8,000 people. A census tract usually covers a contiguous area; however, the spatial size of census tracts varies widely depending on the density of settlement. Census tract boundaries are delineated with the intention of being maintained over a long time so that statistical comparisons can be made from census to census. Census tracts occasionally are split due to population growth or merged as a result of substantial population decline.; Census tract boundaries generally follow visible and identifiable features. They may follow nonvisible legal boundaries, such as minor civil division (MCD) or incorporated place boundaries in some states and situations, to allow for census-tract-to-governmental-unit relationships where the governmental boundaries tend to remain unchanged between censuses. State and county boundaries always are census tract boundaries in the standard census geographic hierarchy. Reference Source: U.S. Commerce Department, United States Census Bureau, February 2022.
Cities/Towns: A mix of both incorporated places (legal entities) and census designated places or CDPs (statistical entities). An incorporated place is established to provide governmental functions for a concentration of people. Places always nest within a state, but may extend across county and county subdivision boundaries. An incorporated place usually is a city, town, village, or borough, but can have other legal descriptions. CDPs are delineated to provide data for settled concentrations of population that are identifiable by name, but are not legally incorporated under the laws of the state in which they are located. Click on city/town name to highlight the boundary. Reference Source: U.S. Census, 2020.
County Commission Districts: For more information, see http://www.accg.org/. The districts were established in 2014, and were obtained from the Association of County Commissioners of Georgia (ACCG). Further processing was performed by the Office of Health Indicators for Planning (OHIP) of the Georgia Department of Public Health. History and role: In 1868 the state began creating the position of county commissioner to administer the general operations of the county. Today every county has a commissioner; many have a board of commissioners (BOC). As part of general county operations, the BOC must finance county programs. A BOC has the power to adopt ordinances, resolutions, or regulations relating to county property, county affairs, and the operation of local government (http://www.georgiaencyclopedia.org/nge/Article.jsp?id=h-589 ).
GA House Districts: Electoral districts from which State Representatives are elected. The Georgia Constitution requires not less than 180 Representatives apportioned by population from representative districts. Layer Source: https://www.legis.ga.gov/, Adopted 2023 – Effective for 2024 Elections.
GA Senate Districts: Electoral districts from which State Senators are elected. The Georgia Constitution limits the number to not more than 56 single member districts. Senate districts are apportioned based on population. Layer Source: https://www.legis.ga.gov/, Adopted 2023 – Effective for 2024 Elections.
Hospitals: Hospitals are inpatient medical facilities in Georgia. Click on the symbol to get the name. Updated 6.23.2025.
Interstates: Interstates are the freeways that are part of the Interstate Highway System in Georgia. The Interstate Highway System connects major cities within the United States. Click on the line to get the Interstate number. Layer Source: Esri, March 1, 2012.
Major Roads: Major roads are a combination of both federal and state highways connecting cities and towns. Click on the line to get the route number. Layer Source: Esri, March 1, 2012.
Perinatal Regions: The Perinatal Regions were established by the Department of Public Health in cooperation with the six teaching hospitals located in Atlanta, Albany, Augusta, Columbus, Macon and Savannah. The Regions reflect the hospital referral patterns for high risk pregnant women and newborns Each of the six hospitals has a Regional Perinatal Center which has contracts with the state and receives funding to care for high risk pregnant women and infants as well as to train staff from other hospitals in perinatal care especially for high risk patients. Reference Source: Georgia Department of Public Health, March 2005.
ZIP Code: Established by the U.S. Postal Service for distribution of mail. Zip codes do not generally respect political boundaries or census areas such as tracts. Zip codes usually do not have clearly identifiable boundaries, often serve a continually changing area, are changed periodically to meet postal requirements, and do not cover all land area in the U.S. Layer Source: Esri, June 1, 2020.

Base Layers:

Base layers are background information to provide contextual references for local-level maps. They are especially suited for tract-level maps and give real-world reference to maps you create in OASIS. There are six toggle-able (on/off) base layers:
Aerial Photograph: World Imagery provides one meter or better satellite and aerial imagery (ESRI).
Simple Street: Light Gray Canvas provides a neutral background with minimal colors, labels, and features allowing the choropleth maps to come to the foreground (ESRI).
Socioeconomic (SES) Vulnerability: Socioeconomic (SES) Vulnerability refers to the socioeconomic status domain/subset of the CDC’s Social Vulnerability Index (SVI) 2020. Socioeconomic vulnerability ranks census tracts within Georgia on 5 factors: below 150% poverty, unemployed, housing cost burden, no high school diploma, and no health insurance. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability/lower socioeconomic status. Quintiles of the percentile rankings were used to create class breaks (Very Low, Low, Average, High and Very High SES Vulnerability). Keep in mind that “Very Low” SES Vulnerability equates to a High SES status. For more information see https://www.atsdr.cdc.gov/placeandhealth/svi/index.html. For data dictionary click here.
Street and Place Names: National Geographic World Map, developed by National Geographic and Esri, is designed to be used as a general reference map for informational and educational purposes (ESRI).
Street Map: World Street Map includes highways, major roads, minor roads, one-way arrow indicators, railways, water features, cities, parks, landmarks, building footprints, and administrative boundaries, overlaid on shaded relief for added context (ESRI).
Street Topographical: World Topo Map includes administrative boundaries, cities, water features, physiographic features, parks, landmarks, highways, roads, railways, and airports overlaid on land cover and shaded relief imagery for added context (ESRI).

Data Classification Methods:

Quantiles: splits the data into equal-sized groups, for example dividing all 159 counties into 5 groups from smallest number to largest. Roughly 32 counties will be in each group.

Natural Breaks (Jenks): looks for clusters in the data and groups similar values together, so each group has numbers that are more alike. For example, if mapping counts by county, Fulton may stand out by itself and be the only county in its group.

Which to use? That depends on what questions you’re trying to answer, and the distribution of the underlying data. Quantiles usually produces more compelling maps when using the Trendable Maps feature on OASIS. Jenks is useful to highlight natural patterns in the data and outliers. In sum:

Quantiles: Showing Overall Spatial Patterns Across Areas

Good for showing distribution evenness or making comparisons between groups.
Pros: Simple, balanced categories.
Cons: Can place very different values in the same class if data are skewed.

Natural Breaks (Jenks): Highlighting Areas With Distinctly High or Low Values

Best when data has uneven distribution or natural groupings.
Pros: Highlights natural patterns in the data.
Cons: Uneven class sizes; harder to interpret or compare across maps.

Definitions:

Age

Ages are presented by Detailed Age Groups, Lifestages and Single Year of Age which is created by the Department of Public Health, OHIP. Also, note that selecting "all ages" will supercede any start and end age selection. Uncheck "all ages" to make an age-specific selection.

Age-Adjusted Rates

A weighted average of the age-specific rates, where the weights are the proportions of persons in the corresponding age groups of a standard population. The calculation of an Age-Adjusted Rate uses the year 2000 U.S. standard million. Benefit: Controls for differences in age structure so that observed differences in rates across areas such as counties are not due solely to differences in the proportion of people in different age groups in different areas. Rates are per 100,000 population.

Cause of Death

Reported causes of illness are based solely on the underlying cause of illness. The underlying cause of illness is defined by the World Health Organization as the disease or injury that initiated the sequence of events leading directly to illness or as the circumstances of the accident or violence that produced the injury. See ADRD CAUSES.

Data Classes

Also referred to as "class breaks" or groupings of data.

Death Rate

Formula = [Number of Deaths / Population] * 100,000. Rates that use Census Population Estimates in the denominator are unable to be calculated when the selected population is Unknown.

Education

The last grade of formal education completed at the time of death. Please note that sometimes the individual levels will not equal the total. This is due to records with Unknown Education Level.

Ethnicity

Hispanic or Latino includes persons of Mexican, Puerto Rican, Cuban, South or Central American, or other Spanish culture or origin, regardless of race. Non-Hispanic + Hispanic may not equal the total number of events due to persons of unknown ethnicity.

International Classification of Diseases, 10th Revision, (ICD-10)

An alphanumeric coding scheme that replaces ICD-9, and used for mortality data since 1999. ICD-10 codes were developed by the World Health Organization Collaborating Centres for Classification of Diseases.

Lifestages

An age year grouping methodology based upon predictable mortality. Georgia uses the following Lifestages: <1 Infancy, 1-4 Early Childhood, 5-12 Later Childhood, 13-19 Adolescence, 20-29 Early Adulthood, 30-44 Young Adulthood, 45-59 Middle Adulthood, 60-74 Late Adulthood, and 75+ Older Adulthood. The highest value for age is 120 years.

Percent of Deaths by Cause

The percent of deaths from a selected cause(s) in selected geography(ies) is of all deaths in the selected geography(ies). If a cause is not selected the user will be prompted to select a cause.

Formula = [Number of cause-specific deaths in the selected geography(ies) / Number of deaths in the selected geography(ies)] * 100

Both the numerator and denominator are filtered by the selected geography, race, and ethnicity.

Race

Per the Federal Office of Management and Budget, Directive 15 (1997),

White is a person having origins in any of the original peoples of Europe, the Middle East or North Africa;
Black or African-American is a person having origins in any of the black racial groups of Africa;
Asian is a person having origins in any of the original peoples of the Far East, Southeast Asia, or the Indian subcontinent including for example, Cambodia, China, India, Japan, Korea, Malaysia, Pakistan, the Philippine Islands, Thailand and Vietnam;
American Indian/Alaska Native is a person having origins in any of the original peoples of North and South America (including Central America), and who maintains tribal affiliation or community attachment;
Native Hawaiian or Other Pacific Islander is a person having origins in any of the original peoples of Hawaii, Guam, Samoa, or other Pacific Islands;
Multiracial is a person declaring 2 or more of these races.

Socioeconomic (SES) Vulnerability

Socioeconomic (SES) Vulnerability refers to the socioeconomic status domain/subset of the CDC’s Social Vulnerability Index (SVI) 2020. Socioeconomic vulnerability ranks census tracts within Georgia on 5 factors: below 150% poverty, unemployed, housing cost burden, no high school diploma, and no health insurance. Percentile ranking values range from 0 to 1, with higher values indicating greater vulnerability/lower socioeconomic status. Quintiles of the percentile rankings were used to create class breaks (Very Low, Low, Average, High and Very High SES Vulnerability). Keep in mind that “Very Low” SES Vulnerability equates to a High SES status. For more information see https://www.atsdr.cdc.gov/placeandhealth/svi/index.html. For data dictionary click here.

ADRD Cause Definitions

Disease Names	ICD10 Codes
Creutzfeldt-Jakob Disease	A81
Vascular Dementia	F01
Dementia in Other Diseases classified elsewhere	F02
Dementia with Anxiety	F02.84, F02.A4, F02.B4, F02.C4
Dementia with Behavioral Disturbance	F02.81-, F02.A1-, F02.B1-, F02.C1-
Dementia with Mood Disturbance	F02.83, F02.A3, F02.B3, F02.C3
Dementia with Psychotic Disturbance	F02.82, F02.A2, F02.B2, F02.C2
Dementia without Behavioral Disturbance	F02.80, F02.A0, F02.B0, F02.C0
Unspecified Dementia	F03
Huntington’s Disease	G10
Parkinson’s Disease Only	G20
Alzheimer's Disease	G30
Alzheimer's Disease with Early Onset	G30.0
Alzheimer's Disease with Late Onset	G30.1
Other Alzheimer's Disease	G30.8
Alzheimer's Disease, Unspecified	G30.9
Other Degenerative Diseases of the Nervous System, not elsewhere classified	G31
Frontotemporal Dementia	G31.09
Senile Degeneration of Brain, not elsewhere classified	G31.1
Degeneration of Nervous System due to Alcohol Wernicke-Korsakoff syndrome	G31.2
Other Specified Degenerative Disease of Nervous System Grey- matter degeneration Lewy body disease	G31.8
Neurocognitive Disorder with Lewy Bodies (contained within G31.8)	G31.83
Corticobasal Degeneration (contained within G31.8)	G31.85
Degenerative Disease of Nervous System, unspecified	G31.9

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V1.7 (7/29/2025)