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Session 38 Alcohol Data In The Fatality Analysis Reporting System (FARS) Trends and Testing Patterns. Anders Longthorne Mathematical Analysis Division. NHTSA Definitions. Blood Alcohol Concentration (BAC) BAC is measured as the weight of alcohol in the - PowerPoint PPT Presentation
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National Center for Statistics & AnalysisPeople Saving People
128th Annual Traffic Records Forum, Orlando, FL
Session 38Alcohol Data In The
Fatality Analysis Reporting System (FARS)
Trends and Testing Patterns Anders Longthorne
Mathematical Analysis Division
National Center for Statistics & AnalysisPeople Saving People
228th Annual Traffic Records Forum, Orlando, FL
NHTSA Definitions
Blood Alcohol Concentration (BAC) BAC is measured as the weight of alcohol in the blood (grams/deciliter or g/dl). Actively Involved Participant A Driver (including MC operators) or Non-Occupant Involved in the Fatal Crash. Crash BAC Maximum BAC level of any Actively Involved Participant in the Fatal Crash. Alcohol Related Driver / Non-Occupant A Driver or Non-Occupant with a Positive BAC.
National Center for Statistics & AnalysisPeople Saving People
328th Annual Traffic Records Forum, Orlando, FL
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Driver Pedestrian Pedalcyclist
In Year 2000 55 Percent of Drivers Had an “Unknown” BAC Test Result
“Unknown” BAC results as Percent of all BAC resultsBy Actively Involved Person Type
Source: 1982-2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
428th Annual Traffic Records Forum, Orlando, FL
State Total Unknown Percent Unknown Total Drivers
Maine 19 8 229Minnesota 192 22 883Vermont 22 24 91Nebraska 95 26 369Mississippi 389 31 1,236Georgia 682 32 2,149South Dakota 69 32 217New Hampshire 56 33 168Delaware 60 34 179Arkansas 312 37 852
INVOLVED DRIVERS BY ALCOHOL TEST RESULTS - FARS 2000
The Ten Best States for TestingDrivers BAC
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
528th Annual Traffic Records Forum, Orlando, FL
State Total Unknown Percent Unknown Total Drivers
North Carolina 1,950 90 2,162South Carolina 1,221 87 1,411Texas 3,860 76 5,061Arizona 995 74 1,348Dist of Columbia 46 74 62New York 1,482 74 2,005Montana 204 72 284Alabama 885 65 1,363Virginia 841 65 1,284Massachusetts 385 64 605
INVOLVED DRIVERS BY ALCOHOL TEST RESULTS - FARS 2000
The Ten Worst States for TestingDrivers BAC
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
628th Annual Traffic Records Forum, Orlando, FL
Multiple Imputation Improves the Quality of FARS Data
Unknown= 55%
Known= 45%
Rate of Driver Alcohol Testing for USA for Year 2000
Multiple Imputation calculatesValues for these “Unknown” Values and allows for valid Statistical Analysis
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
728th Annual Traffic Records Forum, Orlando, FL
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1982
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Perc
ent
Crashes Fatalities
Fatality Rate closely follows Fatal Crash Rate
Alcohol Related Fatal Crashes and Fatalities as a Percent of all Fatal Crashes and Fatalities
Source: 1982-2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
828th Annual Traffic Records Forum, Orlando, FL
0
1020
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5060
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1989
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1996
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1998
1999
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Perc
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0.08 and above g/ dl 0.01-0.07 g/ dl
Most Alcohol Related Crashes Involve BAC levels of 0.08 g/dl
or Greater.
Alcohol Related Fatal Crashes as a Percent of all Fatal Crashes by the Crash BAC
Source: 1982-2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
928th Annual Traffic Records Forum, Orlando, FL
0
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1983
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1999
2000
Perc
ent
Single Multiple
Most Alcohol Related Crashes are Single Vehicle Events
Alcohol Related Fatal Crashes as a % of all Fatal Crashes by the Number of Vehicles in the Crash
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
1028th Annual Traffic Records Forum, Orlando, FL
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Driver Pedestrian Pedalcyclist
Alcohol Trends of Actively Involved persons
Trend of Alcohol Related Drivers, Pedestrians and Pedalcyclists
Source: 1982-2000 FARS File
National Center for Statistics & AnalysisPeople Saving People
1128th Annual Traffic Records Forum, Orlando, FL
63%
37%
Fatally Injured Drivers More Likely to be Alcohol Related
Alcohol Related Drivers as Percent of Drivers Involved in Fatal Crashes for Year 2000
84%
16%
All Fatally Injured Drivers All Surviving Drivers
Alcohol Related
No Alcohol Related
Alcohol Related
No Alcohol Related
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
1228th Annual Traffic Records Forum, Orlando, FL
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Perc
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% Alcohol Related of All Killed % Alcohol Related of All Surviving
Fatally Injured Drivers moreLikely to be Alcohol Related
Alcohol Related Drivers as Percent of Drivers Involved in Fatal Crashes By Their Survival Status
Source: 1982-2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
1328th Annual Traffic Records Forum, Orlando, FL
0
5
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0.01 - 0.09 g/dl 0.10 - 0.94 g/dl
Pe
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Killed Survived
Old Method – Allows for only two Alcohol Classifications for Drivers
with Positive BAC
Distributions of BAC for Drivers Involved in Fatal Crashes By their Survival Status (excluding
BAC=0)
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
1428th Annual Traffic Records Forum, Orlando, FL
0
0.25
0.5
0.75
1
1.25
1.5
1.75
2
0.0
1
0.0
5
0.0
9
0.1
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BAC (g/ dl)
Perc
ent
Killed Survived
New Method – Allows for 94 Alcohol Classifications for Drivers with Positive
BAC
Distributions of BAC for Drivers Involved in Fatal Crashes By their Survival Status
(excluding BAC=0)
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
1528th Annual Traffic Records Forum, Orlando, FL
0102030405060708090
0.01 - 0.09 g/dl 0.10 - 0.94 g/dl
Pe
rce
nt
Killed Survived
Old Method – Allows for only two Alcohol Classifications for Drivers
with Positive BAC
Distributions of BAC for Alcohol Related Drivers Involved in Fatal Crashes By their Survival
Status
National Center for Statistics & AnalysisPeople Saving People
1628th Annual Traffic Records Forum, Orlando, FL
0
1
2
3
4
5
6
0.0
1
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0.0
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0.1
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0.2
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BAC (g/ dl)
Perc
ent
Killed Survived
New Method – Allows for 94 Alcohol Classifications for Drivers with Positive
BAC
Distributions of BAC for Alcohol Related Drivers Involved in Fatal Crashes By their
Survival Status
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
1728th Annual Traffic Records Forum, Orlando, FL
00.5
11.5
22.5
33.5
44.5
5
0.0
1
0.0
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0.0
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3
0.1
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0.2
1
0.2
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0.2
9
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0.8
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BAC (g/ dl)
Perc
ent
Prior DWI None
New Method – Allows for 94 Alcohol Classifications for Drivers with Positive
BAC
Distributions of BAC for Drivers Involved in Fatal Crashes By Prior DWI Convictions
(excluding BAC=0)
Source: 2000 Final FARS File
National Center for Statistics & AnalysisPeople Saving People
1828th Annual Traffic Records Forum, Orlando, FL
QUESTIONS?
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