1. National
Electronic
Injury
Surveillance
Tom Schroeder 2/13
System
*This presentation was prepared by CPSC staff. It has not been reviewed or
approved by, and may not necessarily reflect the views of, the Commission.
.

2. Product-Related
Injuries
Consumer product
injuries = ~ 38 million
Treated in
Treated in ambulator
physicians‟ y
offices care
clinics
Consumer product
injuries treated in
hospital EDs = ~
14 million

3. Overview/History
 National sample of 96 hospitals from all U.S. hospitals
with at least 6 inpatient beds and 24-hour emergency
service.
 Each hospital reports information on emergency
treatments to CPSC.
 Hospital coder enters data in local PC and transmits
the data to CPSC over the internet.
 System collects ~ 400,000 product-related injury
reports each year.
– (additional ~ 300,000 non-CPSC injury reports
each year).
 Multi-level system.
 Supports CPSC and other federal agencies.

4. Overview/History
 Has been in use for over 30 years.
 Last updated with new hospital sample in 1997.
 Data available from 1980-current through FOIA
request.
– 2011 data was finalized March 31, 2012.
 Internet
– On-line estimates from 1991-2011.
– Data available for download from 2002-2011.

6. Why Emergency Department Data?
 Large numbers of injuries are treated there.
 Data are already being captured in ED record
on these cases.
 Hospitals have been very cooperative in
supporting CPSC data collection activities.
 The information is timely.

7. NEISS Surveillance Variables
 Treatment date  Products involved
 Case number (2)
 Age  Locale
 Sex  Type/work-related
 Injury diagnosis  Fire dept.
 Body part injured involvement
 Disposition from  Intent
ED  Race / ethnicity
 Narrative (2 lines)

9. Statistical Basis
 NEISS sample design:
http://www.cpsc.gov/en/Research--
Statistics/NEISS-Injury-Data/
 Follow-back investigations can be conducted
within the statistical framework.

10. Multi-level Data Collection
Capability
 Routine emergency department data
 Emergency department special study - “2nd
screens”
 Telephone investigations
 On-site investigations

17. Baby Walkers and Jumpers (Product Code =1508)
40,000
35,000
30,000
25,000
20,000
Estimated Injuries
15,000
10,000
5,000
Year
0
91 92 93 94 95 96 97 98 99 00 01 02 03 04 05 06 07 08 09 10 11

18. JD62iWvwVe

19. JD62iWvwVe

20. JD62iWvwVe

21. Bunk Beds: Product Code 0661

25. Analyzing NEISS On-Line
Data
 Just Curious
• Use on-line query
• Read some cases
• Historical national estimate

26. Analyzing NEISS On-Line
Data
 Quick Analysis
• Will fulfill most people‟s needs
• Use minimal query to subset the data
• Download the data!
• Read the narratives!
• Manipulate the data in a spreadsheet
• form subgroups
• pivot tables
• always use the „weight‟ variable (sum = national
estimate)

27. Analyzing NEISS On-Line
Data
 Heavy Duty Statistical Analysis
• Download the data!
• Read the narratives!
• SAS – variable formats and general programs on
web-site
• Use PSU, Stratum, Weight!
• Proc Surveymeans
• National estimates with confidence intervals
• Test for statistically significant differences
• Trend analysis across multiple years

28. Analyzing NEISS On-Line
 Caution
Data
• Always use ‘weight’ variable for national
estimates!
• Small sample sizes and estimates!
• Consider multiple product codes
• Other/Not Specfied
• Unknown (locale)
• Denominator Data
• Census population? age adjust?
• units sold? market share?
• participation rates?

29. Analyzing NEISS On-Line
Data
 What NEISS On-Line Does Well
• Trend analysis across time
• must take into consideration sample change in 1997
• Demographics of injured people (age, gender,
body part, diagnosis)
• Product groupings

30. Analyzing NEISS On-Line
Data
 What NEISS On-Line Doesn‟t Do Well
• Deaths
• Non-emergency department treatment
• pediatrician, school nurse, athletic trainer, etc.
• Specific manufacturer
• all PII removed from NEISS narratives
• Detailed product information (use telephone
interviews)
• size and type of television
• engine size of ATV
• age of baby walker, crib

31. CPSC Stands For Safety
Contact Information
tschroeder@cpsc.gov
Tom Schroeder
Statistician, Division Director
Division of Hazard and Injury Data Systems
U.S. Consumer Product Safety Commission
4330 East West Hwy
Bethesda, MD 20814