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J. Lee Annest, Ph.D. Director, Office of Statistics and Programming

Using FARS data to Classify Unspecified MV-traffic Deaths by Person Type in NVSS data. J. Lee Annest, Ph.D. Director, Office of Statistics and Programming National Center for Injury Prevention and Control. The Question. How many MV-traffic deaths are occupants in the vehicle?.

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J. Lee Annest, Ph.D. Director, Office of Statistics and Programming

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  1. Using FARS data to Classify Unspecified MV-traffic Deaths by Person Type in NVSS data J. Lee Annest, Ph.D. Director, Office of Statistics and Programming National Center for Injury Prevention and Control

  2. The Question How many MV-traffic deaths are occupants in the vehicle?

  3. The Problem • In 2001, almost 35% of 42,443 MV-traffic deaths in the NVSS were unspecified for person type (occupant, motorcyclist, pedal cyclist, pedestrian, other) • Current death certificate used in most states not set up to routinely capture person type • New death certificate has a separate data item that should help classify MV traffic deaths by person type (needs to be assessed)

  4. One Possible Solution • Use data from the Fatal Analysis Reporting System (FARS) to allocate unspecified MV-traffic deaths into specified person type categories (occupant, motorcyclist, pedal cyclist, pedestrian, other)

  5. Method • Use the known distribution of FARS deaths for specified person type to determine where to allocate the unspecified MV-traffic deaths in the NVSS.

  6. Allocation Process • First, allocate unspecified deaths into specified person type categories other than occupant • Then, put the remaining unspecified MV-traffic deaths into occupant.

  7. Allocation Rules Applied • Distribute MV-traffic deaths into person type categories within specific age-by-sex groupings • Allocate unspecified deaths into person type categories other than occupant as follows: > If the number of specified death is higher in FARS than NVSS, then change NVSS to the higher number > If the number of specified deaths is higher in NVSS than FARS, then do not change NVSS

  8. Example Pedal cyclist (Males 15-19 years) Deaths Data Source Observed Allocated FARS 66 -- NVSS 57 66 ---------------------------------------------------- Redistributed unspecified = 9

  9. Example Pedestrian (Females 1-4 years) Deaths Data Source Observed Allocated FARS 35-- NVSS 56 56 ---------------------------------------------------- Redistributed unspecified = 0

  10. Allocation Rules Applied 3. Allocate the remaining unspecified deaths to the occupant category 4. Sum deaths across age-by-sex groupings to get final numbers: overall and by broader age and sex groups. 5. After allocation, the distributions of MV-traffic deaths by person type should be very similar for FARS and NVSS

  11. Conclusions • Allocation procedure works well for obtaining national estimates • Procedure not tested for state and local estimates; need to consider: > FARS deaths – reported by where the fatal crash occurred >NVSS deaths – often reported by place of residence rather than place of occurrence

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