NHTSA’S Experience with the Crash Outcome Data Evaluation System

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Presentation transcript:

NHTSA’S Experience with the Crash Outcome Data Evaluation System John Kindelberger National Center for Statistics and Analysis, National Highway Traffic Safety Administration This is a U.S. Government work and may be copied and distributed without permission.

CODES Background Since 1992, NHTSA’s Crash Outcome Data Evaluation System or CODES cultivated State-level data linkage through cooperative agreements with organizations that applied and qualified for their State. Crash report data to medical (Inpatient, ED, EMS) Allows analysis of injuries in crashes (ICD-9 CM, MAIS, ISS etc) Other added data sets (registration, DMV, death, etc) Linkage in different States is challenging each State has different crash report forms, data systems, variables etc. CODES software employs probabilistic linkage and multiple imputation to conduct linkage even without perfect matches.

CODES Background CODES always had a stated goal of institutionalization of CODES in the State. In 2009, NHTSA shared a strategic plan aiming for eventual self-sufficiency of CODES in States. In 2013, NHTSA completed final transition of CODES responsibility to States that opted to continue CODES. During this time the US Centers for Disease Control (CDC) partnered with NHTSA to learn more about CODES.

CODES Background NHTSA still believes in data linkage as an important component of data enhancement, and encourages States to conduct linkage programs. In 2015, NHTSA published three final CODES reports (one with CDC) summarizing CODES and what we learned with the intent of preserving knowledge and helping future linkage projects.

Program Transition & Promising Practices CODES Final Reports Report 1: CODES: Program Transition & Promising Practices John Kindelberger, NHTSA Jacqueline Milani, University of Maryland Contributions from CODES Grantees as acknowledged in the paper

Example, State Promising Practice Data Application Abstract

CODES: Examination of Methodologies CODES Final Reports Report 2: CODES: Examination of Methodologies & Multi-State Traffic Safety Applications Lawrence J. Cook, Andrea Thomas, Cody Olson, Tomohiko Funai, Timothy Simmons University of Utah Intermountain Injury Control Research Center Partially funded by the CDC.

CODES: Examination of Methodologies & Multi-State Traffic Safety Applications Part 1 CODES probabilistic linkage methodology; overview of other linkage software Alternative types of linked data sets Analysis of match probabilities, linking variables Multiple imputation of missing data Part 2: Four topic analyses using combined CODES data

Assessment of Characteristics of State Data Linkage Systems CODES Final Reports Report 3: NHTSA/CDC Report Assessment of Characteristics of State Data Linkage Systems Jacqueline Milani, University of Maryland John Kindelberger, NHTSA Gwendolyn Bergen, CDC Emily Novicki, CDC Cynthia Burch, University of Maryland Shiu Ho, University of Maryland Bethany West, CDC Funded by the CDC.

Assessment of Characteristics of State Data Linkage Systems Survey of CODES and non-CODES State linkage programs Focus groups Assess the facilitators and barriers to successful data linkage programs at State level

CODES Final Reports The three final reports are available at NHTSA’s web site: https://crashstats.nhtsa.dot.gov/#/

Current Events in Linkage A number of CODES States continue linkage in self-sufficient programs. Some non-CODES States have set up linkage projects or are planning to. In Sept. 2015 CDC published a Mortality and Morbidity Weekly Report using CODES data to examine child occupant protection. NCHRP* project 17-57, Development of a Comprehensive Approach for Serious Traffic Crash Injury Measurement and Reporting Systems, UMTRI**report forthcoming Report already available in conjunction with above : NCHRP 20-24(37)K, Measuring Performance Among State DOTs: Sharing Good Practices – Serious Crash Injury (Cambridge Systematics, Inc.) Linkage has a continued presence at ATSIP’s Traffic Records Forum Data linkage round table, 2016 forum * National Cooperative Highway Research Program ** University of Michigan Transportation Research Institute

Thank You For further information john. kindelberger@dot. gov www Thank You For further information john.kindelberger@dot.gov www.NHTSA.gov This is a U.S. Government work and may be copied and distributed without permission.