Differences in the effectiveness of frontal air bags by body size among adults involved in motor vehicle crashes

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11 Citations (Scopus)

Abstract

Objective. There is concern that small stature occupants (particularly women) involved in motor vehicle crashes (MVCs) may be at risk of injury or death from frontal air bags, though evidence to substantiate this concern is lacking. We sought to assess how occupant body size (measured through height and weight) affects air bag effectiveness in mitigating the risk of serious injury, after adjusting for important crash factors. Methods. This was a retrospective cohort study using a national population-based cohort of adult front-seat occupants involved in MVCs as included in the National Automotive Sampling System Crashworthiness Data System database (NASS CDS) from 1995 to 2006. Drivers and front-seat passengers 15 years and older involved in MVCs involving passenger vehicles and light trucks were included in the analysis. The primary outcome was serious injury, defined as an Abbreviated Injury Scale (AIS) score 3 in any body region. Multivariable logistic regression models were used to test interaction terms (effect modification) between air bags, body size, and injury. The predicted probability of injury across body sizes was plotted to further illustrate potential differences. Results. Sixty-nine thousand three hundred eighty-seven adult front-seat occupants during the 12-year period were included in the analysis, of which 9333 (2.3%) were seriously injured. There was no evidence that height or weight modified air bag effectiveness among all crashes (p .40). In primary frontal collisions, there was some evidence for effect modification by weight (p =.04) but not by height (p =.59). When assessed using air bag deployment, height was a strong effect modifier (p =.0078), but not weight (p =.43). Predicted probability figures confirmed that occupant height modifies the effect of air bag deployment, but there was no similar visual evidence for body weight. Conclusions. In this sample, we found no consistent evidence that body size modifies the overall effectiveness of frontal air bags. However, among crashes involving air bag deployment, the effect of deployment on injury differs by occupant height, with a relative increase in the odds of serious injury among smaller occupants. In such crashes, the probability of injury with (versus without) deployment began to increase with occupant heights less than 155 cm (5'), reaching a level of statistical difference below 138 cm (4' 6'').

Original languageEnglish (US)
Pages (from-to)432-439
Number of pages8
JournalTraffic Injury Prevention
Volume9
Issue number5
DOIs
StatePublished - Oct 2008

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Air Bags
Body Size
Motor Vehicles
motor vehicle
Seats
air
Wounds and Injuries
Weights and Measures
Crashworthiness
evidence
Trucks
Logistics
Logistic Models
Abbreviated Injury Scale
Sampling
Body Regions
body weight
Information Systems
Cohort Studies
Retrospective Studies

Keywords

  • Air Bag
  • Injury
  • Motor Vehicle Crash

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Safety Research

Cite this

@article{47fa495f61be43bdae065bf71c333d05,
title = "Differences in the effectiveness of frontal air bags by body size among adults involved in motor vehicle crashes",
abstract = "Objective. There is concern that small stature occupants (particularly women) involved in motor vehicle crashes (MVCs) may be at risk of injury or death from frontal air bags, though evidence to substantiate this concern is lacking. We sought to assess how occupant body size (measured through height and weight) affects air bag effectiveness in mitigating the risk of serious injury, after adjusting for important crash factors. Methods. This was a retrospective cohort study using a national population-based cohort of adult front-seat occupants involved in MVCs as included in the National Automotive Sampling System Crashworthiness Data System database (NASS CDS) from 1995 to 2006. Drivers and front-seat passengers 15 years and older involved in MVCs involving passenger vehicles and light trucks were included in the analysis. The primary outcome was serious injury, defined as an Abbreviated Injury Scale (AIS) score 3 in any body region. Multivariable logistic regression models were used to test interaction terms (effect modification) between air bags, body size, and injury. The predicted probability of injury across body sizes was plotted to further illustrate potential differences. Results. Sixty-nine thousand three hundred eighty-seven adult front-seat occupants during the 12-year period were included in the analysis, of which 9333 (2.3{\%}) were seriously injured. There was no evidence that height or weight modified air bag effectiveness among all crashes (p .40). In primary frontal collisions, there was some evidence for effect modification by weight (p =.04) but not by height (p =.59). When assessed using air bag deployment, height was a strong effect modifier (p =.0078), but not weight (p =.43). Predicted probability figures confirmed that occupant height modifies the effect of air bag deployment, but there was no similar visual evidence for body weight. Conclusions. In this sample, we found no consistent evidence that body size modifies the overall effectiveness of frontal air bags. However, among crashes involving air bag deployment, the effect of deployment on injury differs by occupant height, with a relative increase in the odds of serious injury among smaller occupants. In such crashes, the probability of injury with (versus without) deployment began to increase with occupant heights less than 155 cm (5'), reaching a level of statistical difference below 138 cm (4' 6'').",
keywords = "Air Bag, Injury, Motor Vehicle Crash",
author = "Craig Newgard and McConnell, {Kenneth (John)}",
year = "2008",
month = "10",
doi = "10.1080/15389580802155903",
language = "English (US)",
volume = "9",
pages = "432--439",
journal = "Traffic Injury Prevention",
issn = "1538-9588",
publisher = "Taylor and Francis Ltd.",
number = "5",

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T1 - Differences in the effectiveness of frontal air bags by body size among adults involved in motor vehicle crashes

AU - Newgard, Craig

AU - McConnell, Kenneth (John)

PY - 2008/10

Y1 - 2008/10

N2 - Objective. There is concern that small stature occupants (particularly women) involved in motor vehicle crashes (MVCs) may be at risk of injury or death from frontal air bags, though evidence to substantiate this concern is lacking. We sought to assess how occupant body size (measured through height and weight) affects air bag effectiveness in mitigating the risk of serious injury, after adjusting for important crash factors. Methods. This was a retrospective cohort study using a national population-based cohort of adult front-seat occupants involved in MVCs as included in the National Automotive Sampling System Crashworthiness Data System database (NASS CDS) from 1995 to 2006. Drivers and front-seat passengers 15 years and older involved in MVCs involving passenger vehicles and light trucks were included in the analysis. The primary outcome was serious injury, defined as an Abbreviated Injury Scale (AIS) score 3 in any body region. Multivariable logistic regression models were used to test interaction terms (effect modification) between air bags, body size, and injury. The predicted probability of injury across body sizes was plotted to further illustrate potential differences. Results. Sixty-nine thousand three hundred eighty-seven adult front-seat occupants during the 12-year period were included in the analysis, of which 9333 (2.3%) were seriously injured. There was no evidence that height or weight modified air bag effectiveness among all crashes (p .40). In primary frontal collisions, there was some evidence for effect modification by weight (p =.04) but not by height (p =.59). When assessed using air bag deployment, height was a strong effect modifier (p =.0078), but not weight (p =.43). Predicted probability figures confirmed that occupant height modifies the effect of air bag deployment, but there was no similar visual evidence for body weight. Conclusions. In this sample, we found no consistent evidence that body size modifies the overall effectiveness of frontal air bags. However, among crashes involving air bag deployment, the effect of deployment on injury differs by occupant height, with a relative increase in the odds of serious injury among smaller occupants. In such crashes, the probability of injury with (versus without) deployment began to increase with occupant heights less than 155 cm (5'), reaching a level of statistical difference below 138 cm (4' 6'').

AB - Objective. There is concern that small stature occupants (particularly women) involved in motor vehicle crashes (MVCs) may be at risk of injury or death from frontal air bags, though evidence to substantiate this concern is lacking. We sought to assess how occupant body size (measured through height and weight) affects air bag effectiveness in mitigating the risk of serious injury, after adjusting for important crash factors. Methods. This was a retrospective cohort study using a national population-based cohort of adult front-seat occupants involved in MVCs as included in the National Automotive Sampling System Crashworthiness Data System database (NASS CDS) from 1995 to 2006. Drivers and front-seat passengers 15 years and older involved in MVCs involving passenger vehicles and light trucks were included in the analysis. The primary outcome was serious injury, defined as an Abbreviated Injury Scale (AIS) score 3 in any body region. Multivariable logistic regression models were used to test interaction terms (effect modification) between air bags, body size, and injury. The predicted probability of injury across body sizes was plotted to further illustrate potential differences. Results. Sixty-nine thousand three hundred eighty-seven adult front-seat occupants during the 12-year period were included in the analysis, of which 9333 (2.3%) were seriously injured. There was no evidence that height or weight modified air bag effectiveness among all crashes (p .40). In primary frontal collisions, there was some evidence for effect modification by weight (p =.04) but not by height (p =.59). When assessed using air bag deployment, height was a strong effect modifier (p =.0078), but not weight (p =.43). Predicted probability figures confirmed that occupant height modifies the effect of air bag deployment, but there was no similar visual evidence for body weight. Conclusions. In this sample, we found no consistent evidence that body size modifies the overall effectiveness of frontal air bags. However, among crashes involving air bag deployment, the effect of deployment on injury differs by occupant height, with a relative increase in the odds of serious injury among smaller occupants. In such crashes, the probability of injury with (versus without) deployment began to increase with occupant heights less than 155 cm (5'), reaching a level of statistical difference below 138 cm (4' 6'').

KW - Air Bag

KW - Injury

KW - Motor Vehicle Crash

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