Analysis of Motor Vehicle Related Injuries and Fatalities Among Occupants of Passenger Cars in Illinois

1. Analysis of Motor Vehicle Related Injuries and Fatalities Among Occupants of Passenger Cars in Illinois Mehdi Nassirpour, Ph.D. Susan Fitzpatrick Illinois Department of Transportation Division of Traffic Safety

2. CODES Project and Highway Safety Office • How does CODES project fit with other Highway Safety Programs? • Who are the audience? • Has it been coordinated with ITRCC? • How do program staff react toward the CODES? • What have we done to address these concerns? International Forum on Traffic Records & Highway Safety Information System

3. Objectives • Link 2003 crash data to hospital discharge data. • Provide hospital costs and utilization patterns among those who were injured or died as a result of traffic crashes in Illinois. • Provide descriptive information on number of discharges, average length of stay, primary injuries, types of crash controlling for demographics (age and gender), belt status, vehicle type, expected payment source and discharge status and several other factors. • Develop analytical models to study the relationship between hospital charges, belt status and alcohol impairment, controlling for several demographic, vehicle and crash characteristics. International Forum on Traffic Records & Highway Safety Information System

4. Linkage Project • 2003 Person-level Illinois Crash Records • 2003 Augmented Single Record Hospital Inpatient Admissions • 2003 Hospital Inpatient Admissions with Injuries • 2003 Trauma Admissions • Augmented Inpatient records with data from high probability Trauma records • Built single records from multiple admissions • Imputed Linkages International Forum on Traffic Records & Highway Safety Information System

5. Data Linked Crash Hospital Inpatient Augmented with Data from Trauma International Forum on Traffic Records & Highway Safety Information System

6. Hospital to Trauma Linkage Results International Forum on Traffic Records & Highway Safety Information System

7. Augmented Hospital Inpatient • The addition of E-Codes from high probability linked trauma records led to: • 12 percentage pointincrease in the number of augmented hospital inpatient discharges with E-Code values (from 47.5% to 59.7%) • 3 percentage point increase in the number with motor vehicle related E-Code values (from 5.6% to 8.5%) International Forum on Traffic Records & Highway Safety Information System

8. Crash to Augmented Hospital Inpatient Linkage Results International Forum on Traffic Records & Highway Safety Information System

9. Applications • Alcohol Impairment • Belt Status • Total Hospital Charges • Demographics, Vehicle Type, Crash Type and Location Type International Forum on Traffic Records & Highway Safety Information System

10. List of Variables Used International Forum on Traffic Records & Highway Safety Information System

11. Analyses • Descriptive Statistics (Freq. Percent, and Average) on hospital charges and belt status controlling for several factors. • Use multivariate Statistics (Regular Regression and Logistic Regression) to predict hospital charge, belt status, and alcohol impairment controlling for selected factors (Proc MI and MIANALYZE procedure in SAS used to perform these analyses. International Forum on Traffic Records & Highway Safety Information System

12. Theoretical Diagram Injury Demographics Charge Vehicle Impairment Belt Status Crash Discharge Status International Forum on Traffic Records & Highway Safety Information System

13. Descriptive Results • Crash victims hospitalized as inpatients: • 5, 098 average number of linked records • $31, 649 estimated average hospital charges • 6.8 estimated average length of stay International Forum on Traffic Records & Highway Safety Information System

14. Age Group International Forum on Traffic Records & Highway Safety Information System

15. Gender – Average Charge International Forum on Traffic Records & Highway Safety Information System

16. Belt Status – Charges and LOS International Forum on Traffic Records & Highway Safety Information System

17. Estimated Hospital Charge by Belt Status and Head/Neck Injury International Forum on Traffic Records & Highway Safety Information System

18. Estimated Hospital Charge by Belt Status and Alcohol Impairment International Forum on Traffic Records & Highway Safety Information System

19. Results based on Multivariate Analyses International Forum on Traffic Records & Highway Safety Information System

20. Results of MIANALYZE on Total Charge Per Discharge Controlling for Selected Person, Vehicle and Environmental Variables International Forum on Traffic Records & Highway Safety Information System

21. Results of MIANALYZE on Belt Status Controlling for Selected Person, Vehicle and Environmental Variables International Forum on Traffic Records & Highway Safety Information System

22. Results of MIANALYZE on Alcohol Impairment Controlling for Selected Person, Vehicle and Environmental Variables International Forum on Traffic Records & Highway Safety Information System

23. Future Plan • Complete the analysis • Validate and compare our numbers with other states’ data through NHTSA and other CODES states • Share the results with following groups: • ITRCC members • CODES Advisory Committee members • Highway Safety program Committee members • Use the linked data as source database for the highway safety and injury prevention groups • Publish the results for public use International Forum on Traffic Records & Highway Safety Information System

24. Mehdi Nassirpour, Ph.D. Illinois Department of Transportation mehdi.nassirpour@illinois.gov Website address for this presentation http://www.dot.state.il.us/trafficsafety/tsevaluation.html International Forum on Traffic Records & Highway Safety Information System