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Restraint use and injury in forward and rear-facing infants and toddlers involved in a fatal motor vehicle crash on a U. S. Roadway
Injury Epidemiology volume 6, Article number: 28 (2019)
Use of appropriate child passenger safety restraints reduces injury in infants, with rear facing restraints favored over forward facing. In 2011, the American Academy of Pediatrics (AAP) began recommending that infants and children under the age of 2 years be restrained in a rear-facing seat installed in the vehicle’s rear seat. This study examines the practice of rear-facing restraints pre- and post-AAP recommendations for children under 2 years.
Data from the Fatality Analysis Reporting System (FARS) from 2008 to 2015 were used to examine restraint status and injuries in rear-seated infants and toddlers aged 0 to less than 2 years involved in fatal collisions (n = 4966). Subpopulation analyses were conducted on 1557 children with seat facing direction recorded. Multivariable logistic regression was used to generate odds ratios (OR) with 95% confidence intervals (CI). Covariates considered for inclusion in the multivariable model included passenger characteristics (age, gender, seating position), driver characteristics (age, gender, seat belt status, alcohol status, drug status, previous traffic violations), vehicle characteristics (vehicle type), and crash-level characteristics (day/night, weekday/weekend, rush hour, expressway/surface street, urban/rural).
Approximately 6.7% (330 of 4996) of infants and toddlers were unrestrained with mortality that was approximately triple that of restrained infants (40.0% vs 13.7%, P < 0.0001). In multivariable adjusted models, predictors of an infant being unrestrained included unrestrained driver (OR: 3.17, 95% CI: 2.38–4.21), driver aged less than 20 years (OR: 2.18, 95% CI: 1.42–3.34), driver alcohol use (OR: 2.21, 95% CI: 1.42–3.44), center-seated infant (OR: 1.55, 95% CI: 1.19–2.03) and weekday crash (OR: 1.52, 95% CI: 1.12–2.01). Of all rear-seated children whose restraint status were reported (4966), rear-facing restraint use increased from 5.0% to 23.2% between 2008 and 2015 (P < 0.0001). The odds of rear-facing restraint use increased after introduction of the AAP guideline among infants aged 0 to < 1 year old (OR: 2.12, 95% CI: 1.46–3.10) and among toddlers aged 1 to < 2 years old (OR: 1.97, 95% CI: 1.03–3.79).
Trends in the use of rear-facing child restraints improved over the timeframe of this study, but remain low despite the introduction of AAP guidelines and the strengthening of child restraint laws.
Previous studies have reported that child restraints are effective at lowering mortality and lessening injury severity (Agran et al., 1998; Elliott et al., 2006; Hertz, 1996; Sauber-Schatz et al., 2014; Huang et al., 2016). It is estimated that nearly three-quarters (71%) of infants in passenger cars and 58% of infants in light trucks and vans who die without a child safety seat would have survived had they been restrained properly in a child safety seat (Hertz, 1996). Proper restraint use is influenced by several factors including age, height and weight of the child.
The American Academy of Pediatrics (AAP) recommendation that infants and toddlers aged 0–2 years be in a rear-facing child restraint in the vehicle’s rear seat, originally introduced in 2011, has been updated recently (Durbin et al., 2018) to a policy that now recommends children remain rear-facing for as long as allowable by the car seat manufacturer’s guidelines. The National Highway Traffic Safety Administration (NHTSA) suggests that infants < 1 year of age ride in the vehicle’s rear seat in a rear-facing car seat, and for children over the age of 1 year, that they remain seated similarly for as long as height and weight permit (NHTSA, 2011). Currently, several states have laws or regulations that require infants less than 1 year of age or < 20 lbs. to be transported rear-facing in the vehicle’s rear seat with other states requiring children younger than age 2 or < 40 pounds ride rear-facing in the rear seat (GHSA, 2017).
This study examined trends in infant restraint seat direction in the United States (U.S.). Observed before and after the 2011 policy recommending that infants aged less than two years ride in a rear-facing restraint. Specifically, it examines occupant mortality in infants aged 0 to < 1 and 1 to < 2 years of age who were rear-seated: (1) to characterize predictors of restraint use and non-use; (2) to describe the characteristics and compare trends for rear-facing restraint use pre- and post-2011 AAP recommendations; and (3) to describe the characteristics of fatal crashes with missing restraint documentation.
Fatality Analysis Reporting System (FARS) data from 2008 to 2015 were obtained from the National Highway Traffic Safety Administration’s (NHTSA) public use data files (NHTSA, 2015). FARS is a census of all crashes on U.S. public roads in which at least one person died within 30 days of the crash. FARS contains person-, vehicle- and crash-level variables including driver and passenger characteristics, drug and alcohol information, restraint use, seating position, severity of injury, traffic violations, vehicle body type, crash time and other information. FARS is a publicly available de-identified data set, and this study was deemed exempt by the Columbia University Institutional Review Board (IRB).
Study population with descriptive information on exclusions
Of the 5661 children aged 0 to less than 2 years old involved in a fatal collision on a U.S. roadway, 5378 (95.0%) were occupants in passenger vehicles (Fig. 1). Infants were excluded who were: (1) not a passenger in a motor vehicle in transport (e.g. pedestrians) (n = 283, 5.0%); (2) not being transported in a passenger vehicle equipped with safety belts (n = 41, 0.72%); (3) missing driver information (n = 22, 0.39%); (4) seated in vehicle regions where no restraint was available (sleeper section of cab or enclosed/unenclosed cargo area) (n = 63, 1.11%); or (5) who were seated in the vehicle’s front seat (n = 284, 5.0%).
The final study population included 4966 (87.7%) infants and toddlers who were seated in the vehicle’s rear seat (Fig. 1). More than half (63.3%) of the records for 4242 restrained children did not specify whether they were in a forward-facing or rear-facing restraint system. A subpopulation analysis examined 1557 rear-seated children who had data indicating the direction the child restraint was facing.
Child restraint status was examined as follows: (1) a dichotomous seat-variable for restrained vs. unrestrained; (2) a dichotomous seat-direction variable (rear-facing or forward-facing); and as (3) a four-category variable of child restraint, other restraint, unrestrained, and unknown restraint.
Child injury severity
Child injury severity was categorized as not injured, injured (including non-incapacitating injury, incapacitating injury, injured but severity unknown), died within 30 days of crash, or unknown.
Pre- and post- American Academy of Pediatrics guideline
In late March 2011, the American Academy of Pediatrics (AAP) published a policy recommending that all infants and toddlers ride in a rear-facing seat until 2 years of age (Committee on Injury Violence and Prevention, 2011). Crashes that occurred before April 1, 2011 were defined as Timeframe 1 (pre-AAP policy) and crashes occurring afterward as Timeframe 2 (post-AAP policy). The AAP updated this recommendation in August 2018 to remove the age specification and to say that most children could remain rear-facing beyond their second birthday, but this clarification occurred after our study period (Durbin et al., 2018).
Child passenger age and gender
Child passenger age was examined as a dichotomous variable with age groups 0 to less than 1, and 1 to less than 2 years. Gender was categorized as male, female, and unknown.
Child seating position
Infants and toddlers in row 2 or higher were categorized as rear-seated. Children being transported in row 1 of a vehicle were categorized as front-seated. Child seating position was further categorized as center-seated or seated outboard.
Driver age and gender
Driver age groups were < 20, 20–29, 30–64, ≥65 years, and unknown. Gender was categorized as male, female, or unknown.
Driver’s restraint status was categorized as restrained (shoulder belt only, lap belt only, shoulder and lap belt, restraint used with unknown type, safety belt used improperly, or other restraint), unrestrained, or unknown.
Driver alcohol and drug use
Driver’s alcohol status was categorized as positive, negative or unknown. The driver was considered alcohol positive if police reported alcohol or if the driver had a blood alcohol concentration (BAC) ≥ 0.01. Of the 294 drivers categorized as positive BAC, 77.6% of drivers had BAC ≥ 0.08. Driver’s drug use was categorized as positive, negative or unknown (either not tested, or tested but result unknown). A driver was considered positive for drugs if the police reported drug involvement or if the driver tested positive for drugs.
Driver’s previous moving violations
Previous violations included having a history in the last three years of driver license suspensions or revocations for a moving violation, driving while intoxicated, speeding, or other moving violations within three years of the crash date.
Vehicle body type
Vehicles were categorized as passenger cars, SUVs, vans, pickups or other.
Weekend was defined as 6:00 PM Friday to 6:00 PM Sunday. Weekday and weekend were analyzed as a dichotomous variable.
Daytime was defined as 6:00 AM to 5:59 PM and nighttime was defined as 6:00 PM to 5:59 AM.
Weekday rush hour
Weekday rush hour was defined as 7:00 AM to 9:30 AM or 3:30 PM to 5:59 PM.
Expressways were defined as roadways with limited access, while “surface streets” comprised all other roadways.
The trafficway on which the crash occurred was classified as urban, rural or unknown.
The Chi-square (χ2) test was used in analyses of associations between child restraint status and injury severity and potential covariates. Significance was defined as a P-value < 0.05. Unadjusted and adjusted odds ratios (OR) with 95% confidence intervals (CI) for child restraint use, car seat direction, missing child restraint documentation, and injury/mortality were analyzed using univariable and multivariable logistic regression. Except for age and gender, variables that were not significant predictors of the outcome were not included in the final models of the adjusted association between each predictor and the outcome. Subpopulation analyses were performed on 4466 children who were restrained (in any type of restraint) and on 1557 rear-seated child passengers whose child restraint direction was recorded. All analyses were conducted using SAS version 9.4 (SAS Institute Inc, 2014, Cary, North Carolina).
Of the 5661 children aged 0 to less than 2 years old involved in a fatal motor vehicle collision during the study timeframe, 4966 were rear-seated and comprised the population for this study (Fig. 1).
Restraint status in rear-seated children
Among 4966 rear-seated passengers, 4242 (85.4%) were restrained in a child restraint system, 224 (4.5%) were restrained in a non-child restraint system, 330 (6.7%) were unrestrained and 170 (3.4%) had unknown restraint status (Table 1). Drivers of unrestrained children were nearly 2.4 times more frequently unrestrained compared to drivers of children restrained in a child restraint (P < 0.0001)(Table 1).
Injury/mortality in unrestrained rear-seated infants and toddlers
Among children aged 0 to less than 2 years old involved in a fatal crash, mortality was nearly triple in unrestrained passengers compared to restrained passengers (40.0% vs 13.7%, p < 0.0001) (Table 1).
Factors associated with being unrestrained
Factors associated with the transport of an unrestrained infant passenger are shown in Table 2. In multivariable models, independent predictors of an infant being unrestrained included driver age (drivers aged < 20 years compared with drivers aged 20 to 29), driver restraint status (unrestrained), driver alcohol status (yes-alcohol positive), passenger seating position (center-seated compared to seated outboard), crash time (weekday compared to weekend) (Table 2). There was a tendency for infants traveling at night to be unrestrained in the unadjusted model. In both unadjusted and adjusted multivariable models, driver’s age < 20 years and driver’s unrestrained were predictive of having an unrestrained infant passenger (Table 2). Drivers who tested positive or were police reported as alcohol-involved crash were more likely to have an unrestrained infant compared to those who were alcohol negative (adjusted OR: 2.21, 95% CI: 1.42–3.44). In unadjusted models, the odds of male drivers transporting an infant unrestrained were 33% higher compared to female drivers but this effect was not significant in the adjusted models. Center-seated infants compared to those seated outboard and weekday compared to weekend crashes were associated with infant passengers being unrestrained in both unadjusted and adjusted models (Table 2).
Trends in rear-facing Restraint use
While child restraint use in crashes involving a fatality was stable at approximately 85% across the study period, the transport of all infants and toddlers aged 0 to less than 2 years old for whom restraint status was reported and who were being transported in a rear-facing restraint system increased from 5.0% to 23.2% from 2008 to 2015 (P < 0.0001) (Fig. 2a). During the pre-AAP policy era, the odds of being transported in a rear-facing restraint increased for infants aged 0 to < 1 year old (OR: 3.62, 95% CI: 1.61–8.10). However, this increase was not significant for toddlers aged 1 to < 2 years old (OR: 1.96, 95% CI: 0.62–6.21). During the post-AAP policy era, the odds of an infant aged 0 to < 2 years old being transported in a rear-facing restraint increased (OR: 1.81, 95% CI: 1.33–2.47). Similar to pre-AAP policy era, the increase was higher among children aged 0 to < 1 year old (OR: 2.12, 95% CI: 1.46–3.10) compared to children aged 1 to < 2 years old (OR: 1.97, 95% CI: 1.03–3.79).
Among 4242 children who were restrained in a child restraint system, the majority were missing data on whether the child was in a forward or rear facing restraint direction. The proportion of children with missing data on forward or rear-facing restraint direction decreased significantly from 88.6% in 2008 to 56.3% in 2015 (χ2 = 178.8, p < 0.0001). Among the 1557 children aged 0 to < 2 years with restraint direction recorded, the proportion who were rear-facing increased during post-AAP policy era from 48.6% to 53.1%. Children aged 0 to < 1 years old increased from 73.7% to 85.4% and children age 1 to < 2 years improved from a base of 19.7% to 23.9%) (Fig. 2b).
Factors associated with rear-facing Restraint use
In the subpopulation of 1557, infant passengers aged 0 to < 2 years whose restraint direction was reported, 74.6% were compliant with the NHTSA recommendation that all infants 0 to < 1 year of age travel in rear-facing car seats; 47.8% were compliant with the AAP guideline that all infants 0 to < 2 year of age travel in rear-facing car seats. Infants aged 0 to < 1 year old were more likely to be rear-facing when compared to 1 to < 2 years old (OR: 10.04, 95% CI: 7.95–12.67).
Among infants with restraint direction reported, center-seated infants were more likely to be rear-facing compared to infants seated in an outboard position in multivariable analysis (adjusted OR: 1.41, 95% CI: 1.13–1.75). In multivariable analysis infant passengers who traveled in SUVs were more likely to be rear-facing than infants traveling in cars (adjusted OR: 1.31, 95% CI: 1.05–1.65).
Factors associated with missing/unknown Restraint facing direction
The restraint facing direction was more likely to be reported for infants than for toddlers (44.6% vs 40.3%, p = 0.004) as were injured children compared to uninjured ones (44.4% vs 38.8%, p = 0.0002). Restraint type was more likely to be reported when crashes occurred on expressway than on surface street (42.1% vs 37.8, p = 0.007) (Not shown).
Mortality in front-seated infants and toddlers
There were 284 front-seated child passengers who were excluded from the analysis of rear-seated infants and toddlers aged 0 to < 2 years. Among 912 fatally-injured infants aged 0 to < 2 years, 812 were rear-seated and previously reported. Of the 100 (10.9%) who were front-seated and excluded from previous analysis, 64.0% were unrestrained. Mortality was higher in front-seated compared to rear-seated children (19.6% vs. 13.7%, p = 0.038). The proportion of infants in pickup trucks who were front-seated was approximately five times that of other passenger vehicles (19.6% vs 3.5%; P < 0.0001).
This analysis of all fatal crashes occurring on a U.S. roadway from 2008 to 2015 was conducted to evaluate trends in the use of rear-facing child restraints pre- and post-release of an AAP guideline recommending this policy. Following release of the AAP guideline for rear facing seat restraint for infants and toddlers younger than 2 years of age, the proportion of infants being transported in a rear-facing restraint system increased among children involved in a fatal motor vehicle crash. Although this increase was much larger for infants aged 0 to < 1 year of age, with an increase that was approximately five-fold higher in 2015 compared to the baseline year of 2008, rear-facing restraint use remained unacceptably low. The analysis was first attempted for all rear-seated children aged less than two years of age to assess restraint use and restraint direction. However, due to the large quantity of unreported and missing restraint direction data, a subpopulation analysis was conducted in children with restraint direction recorded.
While the majority of children were restrained in a child restraint system, about one-fifth of children were unrestrained or restrained in a non-child restraint system. The finding that unrestrained children involved in a fatal crash were more likely to be transported by drivers who were unrestrained, younger (aged < 20 years) and positive for alcohol is consistent with previous studies (Hertz, 1996; Huang et al., 2016; Oh et al., 2017). These findings of lack of restraint use by drivers suggests an area where enforcement of seat belt laws in adults transporting children might improve the safety of child passengers as well.
An early study which used the National Automotive Sampling System Crashworthiness Data System (NASS-CDS) database found that infants in rear-facing restraints had lower mortality and 75% fewer serious injuries (including death) compared to those in forward-facing seats (Henary et al., 2007). In 2017, reanalysis of this data with a slightly extended timeframe and survey-weighted Chi-Square tests was conducted on the sampled data. This updated study found that both infants and toddlers 0–11 months old and 12–23 months old tended to experience fewer injuries in rear-facing than front-facing restraints, but the findings failed to reach statistical significance (McMurry et al., 2018). Subsequent biomechanical work on forward- and rear-facing seats has been conducted. Recently, the AAP strengthened their recommendation that infants and very young children ride rear-facing for as long as feasible, which may be beyond their second birthday (Durbin et al., 2018).
Several car seat manufacturers have developed rear-facing car seats for children older than 1 year that accommodate larger height and weight measurements than the originally introduced seats. Despite AAP and NHTSA recommendations and the availability of seats to accommodate rear-facing infants and toddlers, some studies report that up to three-quarters are transported forward-facing earlier than recommended (Macy et al., 2015; NHTSA, 2009; NHTSA, 2016; O'Neil et al., 2011; Winston et al., 2004; Arbogast et al., 2002). Our finding that children in larger SUVs were more likely to be restrained in a rear-facing restraint than those in smaller cars suggests the need for further investigation as to the role that vehicle size and child restraint design might play in early forward-facing restraint direction.
Parental sources of information regarding when to transition to forward-facing car seats are most frequently obtained from car seat packaging and clinicians (doctor/nurse) (Macy et al., 2015). Parents who received information from car seat sellers were more likely to turn their child’s car seat to face forward at 1 year old, while parents who had knowledge of AAP guidelines were less likely to turn car seat forward-facing before age 1. Although 69% of the parents had heard of AAP guidelines, there is still improvement for clinicians to educate parents on current recommendations for infant and toddler car seat safety (Macy et al., 2015). Education that emphasized the benefits of rear-facing restraints was reported to promote the intent and attitude for following rear-facing recommendations.
Improvements in legislation has been promoted as having potential to increase the use of rear-facing restraints. This is thought to establish community safety norms (Macy et al., 2015). However, there has been a time lag in knowledge diffusion and policy adoption. Even though the AAP published rear-facing guidelines in 2011, the first state law adoption did not occur until 2015. As of 2018, only eight states explicitly required the use of a rear-facing car seat until age 2. The uneven legislation among states suggests an opportunity for improved communication among public health researchers, advocates, concerned citizen groups and legislators to promote more effective policymaking (Bruce et al., 2011; Bae et al., 2014).
This study has limitations. Due to the large amount of unreported and missing restraint direction data, it is unknown how children with missing reported seat-facing position may differ from children whose rear-facing position is known. Furthermore, FARS includes only infants and toddlers involved in fatal crashes. Because having a child unrestrained or improperly restrained may have contributed to an increased likelihood to be fatally injured, the results of this study may not be generalizable to the total population of all passengers in this age range. During and since this study data were collected, several states have passed laws to require rear-facing restraints. Further study is needed to examine ways to improve the impact of changing laws on restraint direction.
More than two-thirds of infants and toddlers did not have data on restraint direction recorded. This suggests the need to conduct educational programs to encourage and train law enforcement personnel on the importance of recording restraint use and restraint direction. Improved data collection could facilitate improved examination of factors associated with a rear-facing seating position compared to forward-facing restraints in children involved in fatal crashes and with more in-depth examination of crash and vehicle factors associated with injury outcomes.
In summary, trends in rear-facing restraint use improved over the timeframe of this study. The majority of toddlers aged 1 to < 2 years who are involved in a fatal motor vehicle collision with documented restraint direction are not rear-facing. Despite AAP guidelines and the strengthening of state child restraint laws, an unacceptably low proportion of infants and toddlers are being transported in accordance with current best practices.
American Academy of Pediatrics
Blood Alcohol Concentration
Fatality Analysis Reporting System
National Highway Traffic Safety Administration
Sport utility vehicles
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The authors are grateful for the final manuscript editorial assistance provided by Arusha Arora and Aaron Cheng. The FARS data used for this analysis was provided by the National Highway Traffic Safety Administration (NHTSA). The contents and interpretation of the findings are solely the responsibility of the authors and do not necessarily represent the official views of the Centers for Disease Control and Prevention or the National Highway and Traffic Administration. The contents of the manuscript are the sole responsibility of the authors and do not necessarily reflect the official views of the funding or data collection agencies.
Dr. Joyce Pressley receives partial salary support from the National Center for Injury Prevention and Control of the Centers for Disease Control and Prevention (Grant 1R49 CE002). Publication costs are funded by the Injury Free Coalition for Kids™.
Availability of data and materials
The FARS data set is publicly available and can be downloaded from NHTSA website at https://www.nhtsa.gov/research-data/fatality-analysis-reporting-system-fars.
About this supplement
This article has been published as part of Injury Epidemiology Volume 6 Supplement 1, 2019: Proceedings from the 23rd Annual Injury Free Coalition for Kids® Conference: Forging New Frontiers: Pediatric Injury Prevention - Process, Programs and Progress. The full contents of the supplement are available online at https://0-injepijournal-biomedcentral-com.brum.beds.ac.uk/articles/supplements/volume-6-supplement-1.
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Huang, YY., Liu, C. & Pressley, J.C. Restraint use and injury in forward and rear-facing infants and toddlers involved in a fatal motor vehicle crash on a U. S. Roadway. Inj. Epidemiol. 6, 28 (2019). https://0-doi-org.brum.beds.ac.uk/10.1186/s40621-019-0200-4
- Motor vehicle injury
- Child safety seats
- AAP guidelines