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Interactive Atlas of Reproductive Health: Reading
the Maps and Tables |
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Title
The title of the map or table includes four elements:
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Name of the reproductive health indicator being analyzed (e.g.,
Fetal and Infant Mortality)
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Administrative name of geographic area of the map view (e.g.,
Texas)
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Geographic layer being analyzed (e.g., Smoothed Counties)
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Time period of the data being analyzed (e.g.,2002)
Subtitle
The subtitle of the map or table displays the demographic selections
the user has chosen to define the map population. Example: All Infants;
all races; all ethnicities; and both sexes. This example represents
the default subtitle for infant mortality
Legend
Two methods of map classification are offered by the Interactive
Atlas of Reproductive Health for area analysis. The map classifications
reveal the spatial patterns on a thematic map, and are displayed
with a monochromic color ramp. In addition, three special classes
are also included, and are displayed with a gray color ramp.
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The default classification method is equal interval. Four equal interval
classes are displayed for each map. They are based on the range of the
rates for the selected map area and demographic population.
Example: If the range of rates is 5.6 to 14.4, then the interval
is 2.2 and the class groups will be 5.6–7.8, 7.8–10.0, 10.0–12.2, and
12.2–14.4 This is determined for each map area and will vary from map
to map depending on the range of the rates in the area being analyzed.
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The second classification method is quantiles. Quantiles are groups
with equal numbers of members. Four quantile (quartile) classes are
displayed for each map.
Example: If the chosen map area is Georgia and the analysis units
are counties, then each class will contain 40 of the 159 counties in
Georgia (one will contain 39) based on their hierarchal order. The range
for each class becomes the upper and lower limit within each group.
This is determined for each map area and will vary from map to map depending
on the range of the rates in the area being analyzed.
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The three special classes are no events, insufficient data, and no population.
No events occurs when the event of interest—for example infant deaths—is
zero. Insufficient data occurs where there are events, but the number
is so small that the rate is unstable and therefore not uninterpretable.
No population means that there is no population available from which
to draw events, based on the demographic or risk categories used.
Footnotes
Additional information is added below the maps or tables to help evaluate
the information
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The rate for the selected map extent (view area).
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The national rate.
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The upper and lower 10% rates for the nation for the chosen demographic
group.
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Healthy People 2000 and Healthy People 2010 target rates,
where available.
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Data source.
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Other important notes and cautions.
Page last reviewed: 7/28/08
Page last modified: 1/29/07
Content source: Division
of Reproductive Health, National
Center for Chronic Disease Prevention and Health Promotion
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