Texas Abortion Data
VitalWeb Ajax
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Table of Contents


  1. Introduction

    Quick Guide to Using VitalWeb Ajax

    Multiple Windows

  2. Table Settings

    Main Statistic

    Table Axes (Rows and Columns)

    Statistic / Axis Conflicts

  3. Data Variables

    Categorical Variables

    Range Variables

    Statistic / Variable Conflicts

    Other Settings

  4. Chart Settings

    Bar Chart Coloring

    Bar Chart Layout

    Line Chart Settings #1

    Line Chart Settings #2

    Pie Chart Coloring

    Pie Chart Layout

    Tabular Charts / Chart Links

  5. Map Settings

    Map Coloring

    Map Layout

    Map Color Palettes

  6. Producing and Using Results

    Getting Results

    Viewing Results

    Printing Results

    Saving Results

    When Charts and Maps are Made

  7. Other Information

    Glossary

    County Groupings

    95% Poisson Confidence Limits

    Statistical Methods

    Confidence Intervals

    Data Sources and Limitations

    Links to Related Resources

    Whom to Contact

    Legal Information





Quick Guide to Using VitalWeb Ajax


Start Button First, select settings from within the Main Window:

• Main Statistic, for example "Abortions per 1,000 Females"
• Rows and columns, for example year rows
• Values for data variables, for example race

Next, whenever you are ready:

• Click on "Make Table Now" or "Make Map" to submit your query.
• Results will appear in a separate "Results Window".
• Browse through your results.
• Print your results (if desired).
• Save your results (if desired).

After you have made output:

• Go back to the the Main Window.
• Modify settings as desired.
• Make another map or table.



Multiple Windows


Screenshot: Multiple Windows

VitalWeb Ajax uses multiple browser windows.

• It does not require full-screen windows.
• You can easily switch between browser windows.
• To switch to another window, simply click on it.
• When you exit the Main Window, the other windows go away.

Main Window ("command center") has the majority of settings and action buttons.

Map Settings Window customizes all map settings.

Other Settings Window:

• Click on "Other Settings" in upper right of Main Window.
• A separate "Other Settings Window" pops up.
• Casual users can mostly ignore the other options.
• Advanced users will appreciate the extra power. Help Window is what you are currently viewing.

Results Window displays any output maps or tables.

• Normally, each new result is appended to the Results Window.
• Review previous results by clicking on browser "Back" button. Chart Setting Windows modify bar, line, and pie chart settings.



Main Statistic


Main Statistic - The basic numerical result in the output.

Main statistics include: Reported Abortions | Abortions per 1,000 People | Abortions per 1,000 Females

Selecting - Click on desired setting, such as Reported Abortions.

Example Statistic Selector:

 




Table Axes (Rows and Columns)


Year 0-1920-3940-5960+
1990 1,032 302 545 79
1991 1,134 317 555 88
1992 1,236 348 602 86


Example Table: Year Rows - Age Columns


Rows - Horizontal lines of data, such as the row for 1991.
Row Sort - Rows can be sorted, low to high, or high to low.
Columns - Go up and down, such as the column for age 0-19.
By Variable - Also called "Multi-Tables". Makes a series of tables.

Example Row Variable Selector:  



Selecting - Click on desired setting, such as "Age" or "Race".



Statistic / Axis Conflicts


No Left Turn Sign If there is a conflict between statistic, rows, or columns:

• Vitalnet alerts you of the conflict (mismatch).
• Vitalnet does not allow a table until the conflict is corrected.

Examples of conflicting settings (mismatches) include:

• Race rows, race columns.
• Year rows, year columns.

To correct a conflict, select a different Main Statistic, Row Variable, or Column Variable.



Selecting Data Variables


Data variables include - Age of Woman, Geographic Area, Gestational Age, Marital Status, Procedure, Previous Abortions, Previous Live Births, Race, Year.


Example selector for range variable, such as age or year:

Sample range variable selector

Range variable selector lets you easily:

• Shrink or extend ranges
• Delete highlighted ranges
• Split highlighted ranges
• Apply a standard grouping

Example selector for categorical variable, such as race or sex:

Sample range variable selector

Categorical variable selector lets you easily:

• Add a category as a set
• Merge sets into new set
• Split set into separate sets
• Delete a set



Statistic / Variable Conflicts


No Left Turn Sign Sometimes, a conflict exists between a variable and a population-based rate. Vitalnet automatically prevents this from producing misleading output.

This is best shown with an example: Suppose there are 408,000 births, and the population is 12,000,000 females. Thus, the birth rate is 34 births per 1,000 females (408,000 / 12,000,000).

Now, suppose we try limiting the analysis to women with 12 years education. We know there are 108,000 births to such women. The result would seem to be 9 births per 1,000 such women (108,000/ 12,000,000). But of course this is totally wrong, because the denominator is not adjusted. And we do not have the population denominator data for women with 12 years education, so there is no easy solution.

To resolve this problem, when Vitalnet makes a rate calculation, it automatically prevents spurious results from being produced, by automatically adding all categories to demographic variables that are not included in the population data set.

So, for example, if you try to calculate a birth rate for women with 12 years of education, Vitalnet simply ignores the limitation to 12 years of education. Instead, it includes all levels of education, so the numerator and denominator match up. And it correctly reports that all levels of education were analyzed.

In contrast, if you try to calcuate a cesarean rate for women with 12 years of education, this does not require population data, only requires information on the births, so Vitalnet calculates the cesarean rate, limited to women with 12 years of education.



Other Settings


Other Settings include the following options:

Statistic Modifiers:
None

Secondary Statistics:
Cell Confidence Level - Set Level, or Turn Off
Cell Suppression - Hide Result if Low Count
Table Percents - Row or Column Percents
Trend Algorithm - Trend Analysis Method
Trend Confidence Level - Set Level, or Turn Off

Miscellaneous Details:
Decimal Place Digits - For example, two in 5.78
HTML Output Font - Font for Output Text
Spreadsheet Format - Spreadsheet Data Format
Tabular Chart - Chart Width, or Omit Chart
Unique ID - Put ID on Maps and Charts?



Bar Chart Coloring


Three settings for customizing bar chart colors:

• The background color behind the chart.
• The color palette to use for the bars.
• First color in the palette to use for the bars.

Below are shown the settings, with examples:



Background Color for Chart (12 options)


White


Grey 90


Lemon Chiffon


Light Blue


Color Palette for Bars (4 options)


Bright Colors


Subdued Colors


Bright + Subdued


Black + White


First Color in Palette to Use (10 options)


A Forward


D Reverse


E Forward


J Reverse





Bar Chart Layout


Six ways to customize layout of Vitalnet bar charts:

• Orientation (horizontal or vertical)
• Stacking (with horizontal or vertical bars)
• Bar height • Bar width
• Grid lines • Font size



Vertical or Horizontal Bars


Vertical Bars


Horizontal


Stacked Bars?


Stacked Bars


Not Stacked


Height of Each Bar (9 options)


2 cm High


4 cm High


Width of Each Bar (8 options)


0.2 cm Wide


0.6 cm Wide


Include Grid Lines?


Include Grid


Omit Grid


Font Size for Chart Text (8 options)


10 pt Font


14 pt Font





Line Chart Settings #1


Eight ways to customize Vitalnet line charts:



Background Color for Chart (12 options)


Alice Blue


Light Yellow


Include Data Point Symbols? (2 options)


Include Symbols


Omit Symbols


Radius for Chart Symbols (10 options)


1.0 mm Radius


1.4 mm Radius



Line Chart Height - Set chart height, eg 3.0 cm (9 options).



Line Chart Settings #2



Width of Lines (3 options)


Thin Lines


Thick Lines


Include Grid Lines? (2 options)


Include Grid


Omit Grid


Colored Lines, or Black + White (2 options)


Colored Lines


Black + White Lines



Font Size - Select font size, eg 9 pt (8 options).



Pie Chart Coloring


Three settings for customizing pie chart coloring:

• The background color behind the chart.
• The color palette to use for the pie chart.
• First color in the palette to use (for slice #1).



Background Color for Chart (12 options)


Cornsilk Background


Grey Background


Light Cyan


Color Palette for Pie Chart (3 options)


Bright Colors


Subdued Colors


Mixed Colors


Slice #1 Color to Use (10 options)


Color A for #1


Color B for #1


Color C for #1





Pie Chart Layout


Four settings for customizing pie chart layout:



Slice #1 Clock Position (12 options)


Slice #1 at Noon


Slice #1 at 3:00


Slice #1 at 6:00


How to Label Pie Chart (9 options)


Line + Label


Label Only


Use Legend


How to Display Slice Percents (3 options)


Percent After Label


Under Label


Omit Percents



Pie Chart Radius - Select chart size, eg 2.0 cm (9 options).



Tabular Charts / Chart Links


Tabular chart


A "tabular chart" is a convenient way of making comparisons.

The tabular chart is always made, unless turned off from the "Other Settings" menu. Also, you may specify the width of the columns within the chart.

Chart links: Note the links below the tabular chart. The links connect to additional graphical and data output formats. The example above links to bar chart, text, database, and spreadsheet formats.



Map Coloring



Color Combination (36 options)


Orange-Red


Grey


Red-Blue


Number of Ranges (8 options)


3 Colors


5 Colors


7 Colors


How to Set Ranges (3 options)


Equal Ranges


Equal Counts


Natural Breaks





Map Layout



Boundaries to Display (6 options)


County Boundaries


HSR Boundaries


Border Counties


Cell Suppression (14 options)


Suppression Off


Suppress < 10


Suppress < 30


PNG and PDF formats - Vitalnet always makes both PNG and PDF map output. Access the PDF version by clicking a link at the bottom of the web page with the PNG map. The PDF version is set to 8 1/2 x 11 inches.

Text Font for Map - 9 font options for displaying area labels:   [Serif Normal] [Sans-Serif Normal] [Monospace Normal] [Serif Bold] [Sans-Serif Bold] [Monospace Bold] [Serif Italic] [Sans-Serif Italic] [Monospace Italic]

Time Trend Maps - Finally, Vitalnet can make (not shown here) a series of maps, one map for each selected year range. The map series is cycled within a special interface. The data ranges are the same for each map in the series, so you can directly compare the maps.



Map Color Palettes


1 2 3 4 5 6 7 8 9   Diverging Palette    BW   CB 
                                                        Brown-BlueGreen   - Y
                                                        Pink-Green   - Y
                                                        Purple-Green   - Y
                                                        Purple-Orange   Y Y
                                                        Red-Blue   - Y
                                                        Red-Grey   - -
                                                        Red-Yellow-Blue   - Y
                                                        Red-Yellow-Green   - -
                                                        Spectral   Y -
1 2 3 4 5 6 7 8 9   Sequential Palette    BW   CB 
                                                        Blue   Y Y
                                                        Blue-Green   Y Y
                                                        Blue-Purple   Y Y
                                                        Green-Blue   Y Y
                                                        Green   Y Y
                                                        Grey   Y Y
                                                        Orange   Y Y
                                                        Orange-Red   Y Y
                                                        Purple-Blue   Y Y
                                                        Purple-Green   Y Y
                                                        Purple-Red   Y Y
                                                        Purple   Y Y
                                                        Red-Purple   Y Y
                                                        Red   Y Y
                                                        Yellow-Green   Y Y
                                                        Yellow-Blue   Y Y
                                                        Yellow-Brown   Y Y
                                                        Yellow-Red   Y Y


BW - OK for black and white photocopying?
CB - OK for people with red-green color blindness?
Note: All palettes are suitable for desktop color printing.

References and research used to help design Vitalnet palettes: • LW Pickle, M Mungiole, GK Jones, AA White, "Atlas of United States Mortality", National Center for Health Statistics, 1997. • CA Brewer, "Color Use Guidelines for Mapping and Visualization", in "Visualization in Modern Cartography", Elsevier, 1994. • ColorBrewer web site displays tested color palettes.



Getting Results


Go Sign To produce results:

1. Click on button - Click on "Make Map NOW" or "Make Table NOW". The program sends the query to the server.

2. View Results Window - Output will display in separate window. It takes a few seconds, depending on the analysis, the data set, and how much data.

3. Conflicts prevented - The program does not permit an invalid request. If a problem, such as row / column mismatch, you will be prompted to correct it before submitting request.



Viewing Results


Binoculars

To view results:

1. Scroll results - Use scroll bar, PgUp, PgDn, etc.
2. Print or Save results - Sends to printer or disk.
3. Click on footnote links - Access charts and data files.

If graphics do not display in output, refresh the browser.



Printing Results


Printer To print results from your browser, use one of the following methods:

Press CTL-P - Hold down Control key, and press 'P' key.
Use Browser Icon - Click on Print Icon (if available).
Use Browser Menu - Select "File / Print" (if menu available).

If output table is too wide or long, here are two ways to make it fit:

Use fewer rows or columns. Also makes it easier to understand.
Change browser font size. Typical command is: View / Text Size.

How to print from a spreadsheet or word processor:

1. Click on link for desired format in output footnotes.
2. Download and import the data file:
  • CSV / TSV / DIF for spreadsheets, such as Excel or StarOffice.
  • ASCII for word processor, such as Word or WordPerfect.
3. Format and print from within your spreadsheet or word processor.



Saving Results


File Cabinet To save results displayed in your browser, do one of the following:

Press CTL-S - Hold down Control key, and press 'S' key.
Use Browser Menu - Select "File / Save" (or equivalent).

To save an alternate data format, click on a footnote link:

ASCII text - Import into word processing software.
CSV/TSV/DIF format - Import into spreadsheet software.
dBASE III - For database, GIS, mapping, stats software.

To save a map as an image file, minus any surrounding text:

1. Position cursor over map, using your mouse.
2. Press right mouse button to bring up popup menu.
3. Select "Save" option from popup menu.
4. Specify directory (folder) to save file.

Here are some suggestions on naming files:

Memorable - Select a name that will remind you of the content.
Organized - Organize files into project directories (folders).
Linkable - Use provided unique ID for data files, such as "112jdhkm.dbf".



When Charts and Maps are Made


Whenever you make a table, Vitalnet also usually makes one or more accompanying charts. But it only produces the charts that make sense. If a chart would look terrible, or not be epidemiologically valid, the software does not make it.

Vitalnet avoids making misleading or useless charts. To prevent misinterpretation and embarassing results, Vitalnet intelligently decides when it appropriate to make a chart, as explained below:

Bar charts are only made if the following conditions are met:

• 1 to 20 rows (groups of bars).
• 1 to 10 columns (bars per group).
• No suppressed results (for stacked bar chart).

Line charts are only made if the following conditions are met:

• Range rows (such as age or year).
• No breaks in ranges (not 2000, 2002).
• Rows not sorted. No suppressed results.
• No more than 10 lines (10 columns).

Pie charts are only made if the following conditions are met:

• Cumulative data (counts, some rates).
• One set of numbers (one row or column).
• 2 to 9 pie slices. No suppressed results.

Time trend maps are only produced when all selected year ranges are the same width. For example, 1995-1996, 1997-1998, 1999-2000 is OK. But 1995-1996, 1997-1998, 1999 is not OK. Also, at least 2 year ranges are required. So if you just have 1995-1996 (a single range) selected, Vitalnet does not make a time trend map.

Time trend analysis, when making a table with year rows, is only carried out when: 1) enough year ranges are selected, 2) there are no gaps in the ranges, 3) the ranges are the same width, and 4) the rows are not sorted. When these conditions are met, the time trend analysis is epidemiologically valid.



Glossary



Area set - One or more areas combined.

ASCII file - A text file, with only alphabetical, numerical, and punctuation characters, like you would see in normal text. Vitalnet can produce output in ASCII format.

CDC - Centers for Disease Control and Prevention. US federal health agency.

Cell - A space for a single numerical result in a table, at a row-column intersection.

Cell suppression - An asterisk "*" is placed in cells with fewer events (such as deaths) than a limit set by the user. Row / column totals with exactly one suppressed cell in the row / column are also suppressed. If more than one cell in the row / column is suppressed, the row / column total may be displayed.

Columns - Vertical groupings of data in a Vitalnet table, such as a column for each race group.

Confidence interval (confidence limits) - A range of values within which the true value of a variable is thought to lie, with a specified level of confidence. For a result of 23.5, a confidence interval might be (23.1-23.9). The smaller the interval, the more reliable the result, so 23-24 is more reliable than 13-34. If the 95% confidence intervals do not overlap, there is probably a statistically significant difference. Vitalnet uses several methods to calculate confidence intervals. The output table documents which method was used.

Confidence level - The likelihood that the true value of a variable is within a confidence interval. For example, for confidence intervals at the 95% level, we are statistically 95% certain that the actual value of the variable is within the interval.

CSV format - Comma-separated-value format. CSV files are readily imported into spreadsheet software. Each output item is separated by a comma from surrounding items, and each output text item is surrounded by "double quotes". A comma-separated-value file has "csv" extension. Similar to TSV format.

Data warehouse - A software system, such as Vitalnet, making large complex databases readily available for querying and analysis. A related term is "data mining", finding unexpected relationships in a data set, for further study. Data mining is similar to exploratory data analysis. Vitalnet is excellent at data mining. Of course, keep in mind that the more you look, the more unusual events you will find, just by chance.

dBASE III format - A widely used file format originally for the database software of the same name. Files in dBASE III format may be readily imported into almost any data analysis, graphing, mapping, or other presentation software. Uses dbf extension. Suppressed cells are represented as the number "-1".

DIF format - Data interchange format. DIF files are readily imported into spreadsheet software. The DIF format is too complex to explain in this glossary. Has "dif" extension.

Denominator - The number on the bottom of a fraction. Population data are often referred to as "denominator data", as they are used as denominators to calculate population-based rates.

Export - Produce output that can be read into other computer programs. Vitalnet produces ASCII text (txt), comma-separated-value (csv), HTML (htm), and dBASE III (dbf) files for export.

Filter variable - A variable solely used to filter which records are included in the output. For example, for a single table with race rows and sex columns, age 10-19 is a filter variable.

Footer - Last part of a Vitalnet table. Lists less important details of the analysis, such as the date produced, and data sources. Also contains a unique ID to assist in keeping track of analyses.

Header - First part of a Vitalnet table. Lists key analysis parameters, such as years analyzed.

Import - Read information into a computer program. ASCII text, CSV, TSV, DIF, HTML, and dBASE III files from Vitalnet are easily imported into word processing, spreadsheet, data analysis, mapping, graphing, and other presentation software programs.

Least-squares - A standard method for fitting the best straight line to a set of points. Produces a Y-intercept and a slope defining the least-squares line.

Multiple age groups - One age group for each table row (or column). Example: 0-19, 20-59, 60-99+.

Natural Breaks - Method for determining map ranges. Minimizes "squared deviations from class means".

NCHS - National Center for Health Statistics. US health statistics agency. Part of the CDC.

Population - The number of people living in an area.

Rows - Horizontal lines in a Vitalnet table, such as a row for each race group.

Row sort settings - Vitalnet rows may be sorted in ascending or descending order.

Set - A combination of one or more things. For example, several areas may be combined into an area set.

Single age group - Only one age group (30-49, for example) is selected. A single age group is used for tables that do not have age columns or age rows.

Statistic (Main Statistic) - The basic type of numerical result displayed in a table, chart, or map. For example, birth rate, death rate, population, pregnancy rate, etc.

Table - A set of results produced by Vitalnet. A table has several parts:
 
  1. Header - basic analysis settings
  2. Data section - numerical results
  3. Bar graphs - horizontal charts
  4. Footer - other analysis settings

Tabular chart - A section of a Vitalnet table. Gives an scaleable graphical representation of the data. May be omitted from the output table.

TSV format - Tab-separated-value format. TSV files are readily imported into spreadsheet software. Each output item is separated by a tab from surrounding items, and each output text item is surrounded by "double quotes". A tab-separated-value file has "tsv" extension. Similar to CSV format.

Unknown Values - Unknowns are automatically inserted into a Vitalnet table. For example, a separate row (or column) for unknown race. The rate is assigned as zero for an unknown category, since there is no population denominator to use. Some fields, such as sex for certain data sets, are never unknown, so unknowns are left off the table. When, such as for age-adjusted rates, the unknown variable (age) is different from the rows or columns, the number of unknowns for age is shown below the table.

Vitalnet / VitalPro / VitalWeb - Vitalnet is data warehouse / data analysis software for analyzing health data sets. VitalPro is a Vitalnet system that runs directly on a PC, for example VitalPro for Win32. VitalWeb is a Vitalnet system that runs over the internet, for example VitalWeb Ajax.

Windows - Microsoft PC operating systems. VitalPro runs under any version of Windows.

World Wide Web (WWW) - A widely used part of the internet that may be easily accessed with a web browser. Vitalnet runs on the WWW.



County Groupings


8 Health Service Regions - HSR 1: Armstrong, Bailey, Briscoe, Carson, Castro, Childress, Cochran, Collingsworth, Crosby, Dallam, Deaf Smith, Dickens, Donley, Floyd, Garza, Gray, Hale, Hall, Hansford, Hartley, Hemphill, Hockley, Hutchinson, King, Lamb, Lipscomb, Lubbock, Lynn, Moore, Motley, Ochiltree, Oldham, Parmer, Potter, Randall, Roberts, Sherman, Swisher, Terry, Wheeler, Yoakum HSR 2 / 3: Archer, Baylor, Brown, Callahan, Clay, Coleman, Collin, Comanche, Cooke, Cottle, Dallas, Denton, Eastland, Ellis, Erath, Fannin, Fisher, Foard, Grayson, Hardeman, Haskell, Hood, Hunt, Jack, Johnson, Jones, Kaufman, Kent, Knox, Mitchell, Montague, Navarro, Nolan, Palo Pinto, Parker, Rockwall, Runnels, Scurry, Shackelford, Somervell, Stephens, Stonewall, Tarrant, Taylor, Throckmorton, Wichita, Wilbarger, Wise, Young HSR 4 / 5 North: Anderson, Angelina, Bowie, Camp, Cass, Cherokee, Delta, Franklin, Gregg, Harrison, Henderson, Hopkins, Houston, Jasper, Lamar, Marion, Morris, Nacogdoches, Newton, Panola, Polk, Rains, Red River, Rusk, Sabine, San Augustine, San Jacinto, Shelby, Smith, Titus, Trinity, Tyler, Upshur, Van Zandt, Wood HSR 6 / 5 South: Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston, Hardin, Harris, Jefferson, Liberty, Matagorda, Montgomery, Orange, Walker, Waller, Wharton HSR 7: Bastrop, Bell, Blanco, Bosque, Brazos, Burleson, Burnet, Caldwell, Coryell, Falls, Fayette, Freestone, Grimes, Hamilton, Hays, Hill, Lampasas, Lee, Leon, Limestone, Llano, McLennan, Madison, Milam, Mills, Robertson, San Saba, Travis, Washington, Williamson HSR 8: Atascosa, Bandera, Bexar, Calhoun, Comal, DeWitt, Dimmit, Edwards, Frio, Gillespie, Goliad, Gonzales, Guadalupe, Jackson, Karnes, Kendall, Kerr, Kinney, La Salle, Lavaca, Maverick, Medina, Real, Uvalde, Val Verde, Victoria, Wilson, Zavala HSR 9/10: Andrews, Borden, Brewster, Coke, Concho, Crane, Crockett, Culberson, Dawson, Ector, El Paso, Gaines, Glasscock, Howard, Hudspeth, Irion, Jeff Davis, Kimble, Loving, McCulloch, Martin, Mason, Menard, Midland, Pecos, Presidio, Reagan, Reeves, Schleicher, Sterling, Sutton, Terrell, Tom Green, Upton, Ward, Winkler HSR 11: Aransas, Bee, Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells, Kenedy, Kleberg, Live Oak, McMullen, Nueces, Refugio, San Patricio, Starr, Webb, Willacy, Zapata
 
11 Public Health Regions (Effective 3/1/93) - PHR 1: Armstrong, Bailey, Briscoe, Carson, Castro, Childress, Cochran, Collingsworth, Crosby, Dallam, Deaf Smith, Dickens, Donley, Floyd, Garza, Gray, Hale, Hall, Hansford, Hartley, Hemphill, Hockley, Hutchinson, King, Lamb, Lipscomb, Lubbock, Lynn, Moore, Motley, Ochiltree, Oldham, Parmer, Potter, Randall, Roberts, Sherman, Swisher, Terry, Wheeler, Yoakum PHR 2: Archer, Baylor, Brown, Callahan, Clay, Coleman, Comanche, Cottle, Eastland, Fisher, Foard, Hardeman, Haskell, Jack, Jones, Kent, Knox, Mitchell, Montague, Nolan, Runnels, Scurry, Shackelford, Stephens, Stonewall, Taylor, Throckmorton, Wichita, Wilbarger, Young PHR 3: Collin, Cooke, Dallas, Denton, Ellis, Erath, Fannin, Grayson, Hood, Hunt, Johnson, Kaufman, Navarro, Palo Pinto, Parker, Rockwall, Somervell, Tarrant, Wise PHR 4: Anderson, Bowie, Camp, Cass, Cherokee, Delta, Franklin, Gregg, Harrison, Henderson, Hopkins, Lamar, Marion, Morris, Panola, Rains, Red River, Rusk, Smith, Titus, Upshur, Van Zandt, Wood PHR 5: Angelina, Hardin, Houston, Jasper, Jefferson, Nacogdoches, Newton, Orange, Polk, Sabine, San Augustine, San Jacinto, Shelby, Trinity, Tyler PHR 6: Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston, Harris, Liberty, Matagorda, Montgomery, Walker, Waller, Wharton PHR 7: Bastrop, Bell, Blanco, Bosque, Brazos, Burleson, Burnet, Caldwell, Coryell, Falls, Fayette, Freestone, Grimes, Hamilton, Hays, Hill, Lampasas, Lee, Leon, Limestone, Llano, McLennan, Madison, Milam, Mills, Robertson, San Saba, Travis, Washington, Williamson PHR 8: Atascosa, Bandera, Bexar, Calhoun, Comal, DeWitt, Dimmit, Edwards, Frio, Gillespie, Goliad, Gonzales, Guadalupe, Jackson, Karnes, Kendall, Kerr, Kinney, La Salle, Lavaca, Maverick, Medina, Real, Uvalde, Val Verde, Victoria, Wilson, Zavala PHR 9: Andrews, Borden, Coke, Concho, Crane, Crockett, Dawson, Ector, Gaines, Glasscock, Howard, Irion, Kimble, Loving, McCulloch, Martin, Mason, Menard, Midland, Pecos, Reagan, Reeves, Schleicher, Sterling, Sutton, Terrell, Tom Green, Upton, Ward, Winkler PHR 10: Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio PHR 11: Aransas, Bee, Brooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells, Kenedy, Kleberg, Live Oak, McMullen, Nueces, Refugio, San Patricio, Starr, Webb, Willacy, Zapata
 
24 Councils of Government - COG 1: Armstrong, Briscoe, Carson, Castro, Childress, Collingsworth, Dallam, Deaf Smith, Donley, Gray, Hall, Hansford, Hartley, Hemphill, Hutchinson, Lipscomb, Moore, Ochiltree, Oldham, Parmer, Potter, Randall, Roberts, Sherman, Swisher, Wheeler COG 2: Bailey, Cochran, Crosby, Dickens, Floyd, Garza, Hale, Hockley, King, Lamb, Lubbock, Lynn, Motley, Terry, Yoakum COG 3: Archer, Baylor, Clay, Cottle, Foard, Hardeman, Jack, Montague, Wichita, Wilbarger, Young COG 4: Collin, Dallas, Denton, Ellis, Erath, Hood, Hunt, Johnson, Kaufman, Navarro, Palo Pinto, Parker, Rockwall, Somervell, Tarrant, Wise COG 5: Bowie, Cass, Delta, Franklin, Hopkins, Lamar, Morris, Red River, Titus COG 6: Anderson, Camp, Cherokee, Gregg, Harrison, Henderson, Marion, Panola, Rains, Rusk, Smith, Upshur, Van Zandt, Wood COG 7: Brown, Callahan, Coleman, Comanche, Eastland, Fisher, Haskell, Jones, Kent, Knox, Mitchell, Nolan, Runnels, Scurry, Shackelford, Stephens, Stonewall, Taylor, Throckmorton COG 8: Brewster, Culberson, El Paso, Hudspeth, Jeff Davis, Presidio COG 9: Andrews, Borden, Crane, Dawson, Ector, Gaines, Glasscock, Howard, Loving, Martin, Midland, Pecos, Reeves, Terrell, Upton, Ward, Winkler COG 10: Coke, Concho, Crockett, Irion, Kimble, McCulloch, Mason, Menard, Reagan, Schleicher, Sterling, Sutton, Tom Green COG 11: Bosque, Falls, Freestone, Hill, Limestone, McLennan COG 12: Bastrop, Blanco, Burnet, Caldwell, Fayette, Hays, Lee, Llano, Travis, Williamson COG 13: Brazos, Burleson, Grimes, Leon, Madison, Robertson, Washington COG 14: Angelina, Houston, Jasper, Nacogdoches, Newton, Polk, Sabine, San Augustine, San Jacinto, Shelby, Trinity, Tyler COG 15: Hardin, Jefferson, Orange COG 16: Austin, Brazoria, Chambers, Colorado, Fort Bend, Galveston, Harris, Liberty, Matagorda, Montgomery, Walker, Waller, Wharton COG 17: Calhoun, DeWitt, Goliad, Gonzales, Jackson, Lavaca, Victoria COG 18: Atascosa, Bandera, Bexar, Comal, Frio, Gillespie, Guadalupe, Karnes, Kendall, Kerr, Medina, Wilson COG 19: Jim Hogg, Starr, Webb, Zapata COG 20: Aransas, Bee, Brooks, Duval, Jim Wells, Kenedy, Kleberg, Live Oak, McMullen, Nueces, Refugio, San Patricio COG 21: Cameron, Hidalgo, Willacy COG 22: Cooke, Fannin, Grayson COG 23: Bell, Coryell, Hamilton, Lampasas, Milam, Mills, San Saba COG 24: Dimmit, Edwards, Kinney, La Salle, Maverick, Real, Uvalde, Val Verde, Zavala
 
32 La Paz Border Counties - Brewster, Brooks, Cameron, Crockett, Culberson, Dimmit, Duval, Edwards, El Paso, Frio, Hidalgo, Hudspeth, Jeff Davis, Jim Hogg, Kenedy, Kinney, La Salle, McMullen, Maverick, Pecos, Presidio, Real, Reeves, Starr, Sutton, Terrell, Uvalde, Val Verde, Webb, Willacy, Zapata, Zavala (The 32 counties either touching the US - Mexico border or touching a county on the border)
 
15 Immediate Border Counties - Brewster, Cameron, El Paso, Hidalgo, Hudspeth, Jeff Davis, Kinney, Maverick, Presidio, Starr, Terrell, Val Verde, Webb, Willacy, Zapata (The 14 counties touching the US - Mexico border, plus Willacy)



Statistical Methods


The "Main Statistic" (numerical outcome) is the basic type of number in a Vitalnet table. It is best understood by looking at the examples below.

Abortions - The number of live births.

Abortion Rate per 1,000 Total - Abortions per 1,000 total population.

Abortion Rate per 1,000 Women - Abortions per 1,000 female population.



Confidence Intervals



Definition - A "confidence interval" is a range of values within which the true value of a variable is thought to lie, at a certain "confidence level", such as 95%. A larger percentage (such as 99%) is more stringent than a smaller percentage (such as 80%). Use 95% if you are unsure.

Interpretation - The smaller the interval, the more reliable the result. Two results that overlap at the 95% level are less likely to be significantly different than results which do not overlap.

Methods - The method Vitalnet uses to calculate confidence intervals depends on the context. The method is listed in the footnotes to the table.

Z * Rate / Sqrt (Events) - This method is recommended by the NCHS. Technical Appendix of the Vital Statistics of the United States, Vol II, Mortality, Part A

Poisson distribution - This method is valid if events are relatively rare, which usually applies to health events. Scientific Tables, Diem and Lentner (ed), Giegy, 1970, page 189.



95% Poisson Confidence Limits


Events Lo Factor Hi Factor Events Lo Factor Hi Factor Events Lo Factor Hi Factor
1 0.025318 5.571647 70 0.779549 1.263440 4,000 0.969250 1.031230
2 0.121104 3.612346 80 0.792938 1.244587 5,000 0.972473 1.027911
3 0.206224 2.922426 90 0.804118 1.229170 6,000 0.974857 1.025464
4 0.272466 2.560398 100 0.813640 1.216268 7,000 0.976711 1.023564
5 0.324697 2.333667 200 0.866209 1.143395 8,000 0.978207 1.022034
6 0.366982 2.176580 300 0.890041 1.116362 9,000 0.979446 1.020767
7 0.402052 2.060382 400 0.904401 1.100401 10,000 0.980496 1.019696
8 0.431729 1.970399 500 0.914267 1.089575 20,000 0.986189 1.013907
9 0.457263 1.898312 600 0.921584 1.081617 30,000 0.988716 1.011348
10 0.479539 1.839036 700 0.927291 1.075453 40,000 0.990224 1.009824
20 0.610826 1.544419 800 0.931904 1.070497 50,000 0.991254 1.008785
30 0.674696 1.427562 900 0.935734 1.066400 60,000 0.992014 1.008018
40 0.714415 1.361716 1,000 0.938980 1.062941 70,000 0.992606 1.007422
50 0.742219 1.318376 2,000 0.956653 1.044307 80,000 0.993082 1.006942
60 0.763105 1.287198 3,000 0.964536 1.036105 90,000 0.993477 1.006544





Data Sources and Limitations


VitalWeb Ajax uses data from authoritative sources.

Abortion data - All Texas abortion data were provided by the Bureau of Vital Statistics, Texas DSHS

Population data - Pre-1990 population data are from the Center for Health Statistics, Texas DSHS. Population data for 1990 and subsequent years are from the State Population Center at Texas A&M.



Links to Related Resources


Internet resources related to Abortion Data:

Bureau of Vital Statistics - Texas DSHS
Center for Health Statistics - Texas DSHS



Whom to Contact


For additional assistance with analyzing and interpreting the data, contact:

• Population data - Center for Health Statistics - 512-458-7261


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Documentation produced: "Sep 26 2019" - Contact EHDP