Data Users Conference
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Transcript of Data Users Conference
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Data Users Conference
Patricia Barnes, M.A.
National Health Interview SurveyUsing the 1997 and 1998 Injury
and Poisoning Data Files
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National Health Interview SurveyUsing the 1997 and 1998 Injury
and Poisoning Data Files
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The Focus of the Injury and Poisoning Data
Prior to 1995:
Beginning in 1997:
Conditions
Episodes
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Location of Injury and Poisoning Data
1995: Condition file
1997: Injury Episode file Injury Verbatim file Poison Episode file Person file
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Episode Based Files
Injury Episode file
Injury Verbatim file
Poison Episode file
A person will appear in these files as many times as
he/she has unique episodes
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Person Based File
Person file
A person will appear only one time in this file
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Where to Find Injury and Poisoning Data
www.cdc.gov/nchs/nhis.htm 1997
CD Rom
1998 www.cdc.gov/nchs/nhis.htm
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How Do I Get the Data?
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Downloading Data from Website
Create subdirectory calledNHIS1997 for 1997 data and NHIS1998 for 1998 data on hard drive
Download file to subdirectory
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Extracting the .EXE File
From DOS – Type file name without .EXE extension
From Windows – double click on file
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1997 NHIS CD Rom
Files are in ASCII format
Files can be read directly from CD Rom
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How Do I Read In the ASCII Files?
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How Do I Read In the ASCII Files?
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Reading in the Data
SAS Programs
File name.sas
SPSS Programs
File name.sps
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SAS/SPSS Programs
Website: save programs to hard drive
www.cdc.gov/nchs/nhis.htm
CD Rom: read programs directly from CD Rom
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INJEPSOD.SAS Results
ASCII converted to SAS
Variable and value labels
Contents procedure of file
Weighted and unweighted frequency counts of
variable record type
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Removing Value Label Formatting
Add format statement to procedure
For specific variables: format variable name(s);
For all variables: format _all_;
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How Do I Put the Data Together?
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Concatenating Injury and Poisoning Episode Files
Injury Poisoning+Injury
Poisoning= Missing Data, Questions not found in both files
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Merging Injury/Poisoning Episode File and Person File
+ PersonInjury
Poisoning
= Missing Data, Questions not found in both files
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Merged Injury/Poisoning Episode File and Person File
Injury
PoisoningPerson
= Missing Data, Questions not found in all files
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Things to Know About the Files: Those Little Quirks
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Things to Know About the Files: Those Little Quirks
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Calculating Annual Estimates
(variable)(4)(WTFA) = Annual Estimate of Variable
Annual estimates of episodes and conditions can be made
Annual estimates of the number of persons injured can NOT be made due to the 3 month reference period
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Injury and Poisoning Episode Files:
Variance Estimation
Design information from the entire sample must be used in variance estimation
Design information is found in the Person file
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Injury Episode FilePoisoning Episode File
Injury Verbatim File
Contain ONLY injury or poisoning information and unique identifiers
Must be linked to the Person file to obtain sociodemographic
variables, design variables, etc.
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Injury Episode File
Contains a maximum of:
four injury episodes
four ICD-9-CM codes
three E codes
Contains nine poisoning episodes in 1997
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Injury Episode File
ICD-9-CM code and E codes are based on information supplied by respondents, not medically trained personnel
Analysts should be cautioned against making estimates based on small numbers of observations
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Poisoning Episode File
Contains no ICD-9-CM codes or E codes
Contains episodes coded as “Allergic/adverse reaction to medical or other substance” or “Something else – NOT poisoning”
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Injury Verbatim File
Edited only for confidentiality
Grammatical and/or spelling errors were not corrected
Analysts should be cautioned against making estimates based on small numbers of observations
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Injury Section – Person File
Contains summary information about injury and poisoning episodes
Annual estimates can only be made on variables INJCT, ICD9CT, and POICT
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Successful and Happy Injury Data User
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The End…..Any Questions?
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The End