Injury Prevention and Control
Modena Hoover Wilson
Rebecca Levin-Goodman
In the United States and many other countries, injury is the leading cause of death for pediatric patients who survive the perils of the first few days and months of life. Injury also is a prominent cause of morbidity and disability. It precipitates numerous emergency department visits and hospitalizations and adds substantially to health care costs. To say that injury is now the most important health problem of childhood is not an exaggeration.
Injury is a disease that is neither inherited nor congenital. An agent outside of the child is always involved, and injury therefore can be prevented. After injury occurs, prompt and appropriate medical care is needed to minimize the consequences.
Injury control includes preventing events that may cause injury; preventing or modifying the transfer of energy, which eliminates or minimizes the injury if the event occurs; and ensuring timely and age-appropriate field care, transport, treatment, and rehabilitation for the injured child if injury occurs.
The subset of injuries that are often labeled “intentional” (e.g., homicide and suicide) accounts for a significant proportion of injury deaths, even in childhood (Table 16.1). These receive special attention in Chapter 105. This chapter is directed toward the prevention of unintentional injury.
EPIDEMIOLOGY OF INJURY IN CHILDHOOD AND ADOLESCENCE
Motor vehicle–related events claim more children’s lives than any other event (Table 16.1), but other numerically important causes of unintentional injury deaths during childhood and adolescence include drowning, pedestrian events, suffocation, fires and burns, poisonings, pedalcyclist events, unintentional firearm injuries, and falls (Table 16.1).
Although during early infancy the number of injury deaths is exceeded by other causes, the importance of injury should not be overlooked. Injury death rates during the first year of life are high when compared with injury death rates in other preadolescent age groups. Unintentional injury causes approximately 45% of all childhood deaths occurring after infancy (Table 16.2).
The events leading to injury death vary by age, because children differ in vulnerability, ability, and exposure to hazards by age. Compare the toddler who inadvertently hangs in the drapery cord with the intoxicated adolescent driver who crashes into a tree after the graduation party.
Death from injury is tragic and all too common, but it is only a portion of the injury problem. According to the Centers for Disease Control and Prevention, for every childhood death caused by injury, there are approximately 34 injury-related hospitalizations and 1,000 emergency department visits. Every year 20% to 25% of children are injured severely enough to need medical attention, miss school, and/or be confined to bed rest. Other data, inclusive of persons of all ages and injury events of all types, show that approximately 150,000 injury deaths occur in the United States each year. Confirming the scope of the problem are the estimates that for every one of those deaths there are approximately 18 injury-related hospitalizations, 250 emergency department visits for injury, and 400 episodes of injury.
PRINCIPLES OF INJURY CONTROL
The enormous number of unintentional injuries has prompted an increasingly organized effort to understand and control the problem. Several key principles have emerged.
TABLE 16.1. NUMBER OF INJURY DEATHS FOR CHILDREN AND ADOLESCENTS, BY AGE GROUP, UNITED STATES, 2000 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Injury control is more than accident prevention. An injury is not the same as an accident. The focus for the health professional should be on controlling the disease (i.e., the injury). Although unintended, most accidents and the injuries they produce are predictable. For example, it is easy to foresee that a child riding a walker may fall down an unguarded stairway or off a porch and be injured on the hard surface below. These injury-producing events can be predicted and avoided. Injuries can be prevented even though accidents occur. To illustrate, seat belts do not prevent car crashes, but they do decrease injuries sustained in a car crash. While the word “accident” is commonly used by the public to refer to events that result in injury, many injury control specialists propose avoiding the word entirely because it may connote that injuries are unavoidable.
Injury can be viewed in the same epidemiologic framework as infectious disease. Energy is the agent of injury. Although the full list includes chemical, radiation, and electrical energy, most pediatric injury is caused by mechanical or thermal energy. The injury occurs when energy impinges on the host at a level the host cannot resist. Like the microbial agents of infectious diseases, the agents of injury can be conveyed to the host by an inanimate object (e.g., vehicle) or an animal (e.g., vector). The agent and host interact in an environment that is subject to biologic, social, and economic influences, all of which may influence the result. Injury can be controlled by influencing one or more of these factors: agent, vehicle, vector, host, or environment.
Injury-control strategies can be grouped by their temporal relation to the injury event. Some strategies are preevent phase; they reduce the likelihood that an event with injury-producing potential will occur. Some are event phase in that they reduce injury during the event. Postevent phase strategies reduce the resulting damage after the injury has occurred.
Reducing injury requires preventing or reducing the interaction between the agent and host, and a complete approach to injury control requires attention to all three phases of the injury event. Haddon has provided an organizing framework for understanding the relationship of variables and interventions to the potential for injury. Table 16.3 provides examples of how the Haddon Matrix can be applied to various types of unintentional injury.
To be effective, a strategy must decrease injury if it is used, and it must be used. These are separate considerations. Many strategies have never been adequately evaluated. The Harborview Injury Prevention and Research Center provides systematic reviews of the effectiveness of childhood injury prevention interventions on the World Wide Web. Strategies are sometimes recommended by advocates before evidence of effectiveness has accumulated because they make scientific sense or because they are similar to other successful strategies. If strategies are retained despite demonstrated lack of efficacy, resources are diverted from developing or promoting effective alternatives.
Efficacious strategies may fail because people fail to use them. Unfastened seat belts do not reduce injury. A prime role for health professionals is to educate and motivate families to use strategies known to prevent or reduce injury.
The most desirable injury control strategies are automatic. Automatic, or passive, strategies are those that protect persons without individual action, or they are built in. For example, if all passenger cars are factory equipped with driver-side airbags, male adolescent drivers, a group at extremely high risk for car-crash injuries and death, benefit without any change in their knowledge or behavior.
By contrast, strategies that require frequent individual action, such as buckling a seat belt, are called active. These strategies are likely to be omitted by some people all of the time and by many people at least some of the time. Achieving widespread use of new active strategies (e.g., car safety seats) appears to require the addition of incentives and removal of disincentives and may only occur after a gradual change in cultural attitudes. Some persons, often those at highest risk, are unprotected because they fail to comply.
TABLE 16.2. AGE-BASED INJURY PREVENTION COUNSELING TOPICS | |||||||||||||||||||||||||||||||||||||||||
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Many strategies fall between the two extremes of active or passive. For example, a parent may take action once to protect family members over time by turning down the water heater to prevent scald burns or by installing an automatic sprinkler system to reduce the possibility of fire. Purchasing, installing, and maintaining a smoke alarm powered by batteries requires periodic action.
Passive strategies are usually preferable to active strategies because they avoid the issue of compliance and are therefore more effective. Unfortunately, passive strategies are not available to prevent all types of injuries. Health care providers must continue to encourage the use of active strategies that are known to be efficacious.
Strategies that prevent unintentional injuries may also prevent some inflicted injuries: abuse, homicide, and suicide. For instance, if water heaters do not heat water to a temperature that will burn skin, tap water scalding is prevented no matter what the intent of the caregiver. Reduction in the availability of handguns can be expected to prevent unintentional childhood and adolescent firearm deaths and many homicides and suicides.
AVENUES OF INJURY CONTROL
Education and Health Promotion
Health professionals traditionally try to change behaviors that affect health by counseling patients and their families. Understanding of successful physician communication and counseling techniques continues to grow. Certainly, anticipatory guidance for injury prevention must go beyond the simple delivery of information. Increased knowledge about an injury problem and prevention strategies does not lead reliably to action. Counseling for behavior change requires soliciting information (finding out what the parent or patient knows, is doing, and intends to do); providing sensitive and sensible advice; focusing on parental or patient perceptions of risks, benefits, and barriers to change; and encouraging change through time.
An increasing number of injury issues are being added to the list of possible subjects for anticipatory guidance. They compete for the limited time available during a health supervision visit. The health provider must have a strategy for setting
priorities among injury-prevention topics. An implicit and an increasingly more explicitly stated approach is to base choices on the child’s developmental age, features of the preventable injury (severity, frequency), and features of the recommended prevention strategy (e.g., demonstrated effectiveness, availability, and cost).
priorities among injury-prevention topics. An implicit and an increasingly more explicitly stated approach is to base choices on the child’s developmental age, features of the preventable injury (severity, frequency), and features of the recommended prevention strategy (e.g., demonstrated effectiveness, availability, and cost).
TABLE 16.3. HADDON MATRIX | ||||||||||||||||||||||||||||||||||||||||
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Gains have been made with a health promotion approach that delivers the message from many respected sources and provides rewards for demonstrating the desirable behavior. Schools, community groups, agencies, and the popular media all can have roles in modifying beliefs and behaviors that affect injury and injury prevention. Informed health care providers can stimulate and advise on these efforts by providing leadership or consultation.
Educating persons in power, whose decisions determine the risk of injury for many, may produce the best results. These people include leaders in schools and child-care centers, health care providers, leaders of public agencies, legislators and regulators, law enforcement professionals, leaders of voluntary organizations, designers, architects, builders, engineers, leaders of business and industry, and those controlling the mass media.
Legislation, Regulation, and Enforcement
Legislative and regulatory efforts to bring about injury control can occur at the local, state, or federal level. Little uniformity exists among local jurisdictions or states with regard to measures affecting injury. Illustrating this is motor vehicle occupant safety. Although an increasing number of states require seat belt use by front-seat car occupants and all require car safety seat use for particular categories of young passengers, the specific legislation varies widely. Some states allow primary enforcement, which means that noncompliance is sufficient reason to stop the driver. Others allow only secondary enforcement, meaning that the citation can be made only if another offense has prompted action. Passenger ages and positions, vehicle types, and penalties under the law also vary, leaving many persons unprotected even by full compliance with the law. The level of enforcement is not uniform and often is so spotty that it negates the intention of the measure. Nevertheless, the impact of such legislation on injury can be documented. States with long-standing car safety seat laws have experienced decreased infant motor vehicle occupant death rates. Specifically designed legislation has been shown to be an effective strategy for injury control. Health professionals should be advocates for children in the legislative arena.
Legislative authority or specific legislation must precede agency action in many cases. Agencies that control personal practices and the environment (e.g., boards of parks and recreation, health departments, schools, athletic associations, traffic authorities, regulators of consumer products) can promulgate within their authority regulations that decrease the likelihood of childhood and adolescent injury. Smoke alarm and sprinkler system requirements can be set for building construction, specific pool fencing requirements can be mandated, children transported in private cars on school trips can be required to wear seat belts, and fireworks can be prohibited within city limits. The success of well-designed regulations depends on enforcement or the perception of enforcement. Unenforced regulations, like knowledge without behavior change, cannot prevent injury.
Legislation enacted for other reasons may also have injury-reduction potential. The Emergency Highway Energy Conservation Act (1974) reduced the speed limit to 55 miles per hour to conserve gasoline. The highway death rate fell. When many states revoked this conservative limit, deaths increased with speeds. A bill requiring a deposit on glass bottles, promulgated for environmental reasons, resulted in fewer pediatric emergency department treatments of lacerations. The activity of the Consumer Product Safety Commission (CPSC), created by the Consumer Product Safety Act of 1972, is the centerpiece of federal efforts to eliminate unreasonable hazards associated with consumer products. In this role and as administrator of several earlier acts (the Flammable Fabrics Act, 1953; the Refrigerator Safety Act, 1956; the Federal Hazardous Substances Act, 1960; and the Poison Prevention Packaging Act, 1970), the CPSC has had a special role in injury control for children. It reacts to petitions, complaints, or clues from its surveillance
systems, including the National Electronic Injury Surveillance System, which collects injury data from approximately 100 hospital emergency departments nationally. The CPSC can negotiate voluntary product changes, and it can regulate sales and force product recalls. There has been significant public concern over the safety of children’s products and furniture, which often are not subject to stringent testing standards, and the effectiveness of the product recall system. Health professionals can advocate for voluntary product testing by manufacturers and encourage parents and child care providers to be aware of product recalls announced by the CPSC. Health professionals should bring product-related injuries to the attention of the CPSC and CPSC findings to the attention of their patients and communities.
systems, including the National Electronic Injury Surveillance System, which collects injury data from approximately 100 hospital emergency departments nationally. The CPSC can negotiate voluntary product changes, and it can regulate sales and force product recalls. There has been significant public concern over the safety of children’s products and furniture, which often are not subject to stringent testing standards, and the effectiveness of the product recall system. Health professionals can advocate for voluntary product testing by manufacturers and encourage parents and child care providers to be aware of product recalls announced by the CPSC. Health professionals should bring product-related injuries to the attention of the CPSC and CPSC findings to the attention of their patients and communities.
Litigation
Where educational, legislative, and regulatory options have failed to bring about injury control, litigation may succeed. Pertinent to the protection of adolescent drivers, for instance, is the facilitating role that litigation against automobile makers has played in expediting the provision of airbags in automobiles. More recently, various municipalities have pursued lawsuits against gun manufacturers, modeled on successful litigation against the tobacco industry, in hopes of encouraging manufacturers to take steps to limit children’s access to firearms.
INJURY CONTROL AND PERSONAL FREEDOM
Objections to the implementation of injury control strategies are often framed as defenses of personal freedom. For younger children, the argument is sometimes made that injuries are a necessary part of the trial and error learning process of growing up. However, automatic strategies—those that protect the child without constant action—can be viewed as freeing the child to explore with less restriction in an inherently safer environment. Protection of the young child is generally accepted with less tension than measures addressing any other segment of the population. Many precedents exist for societal intrusion to ensure the health and welfare of children.
The argument against restricting adolescents to protect them from injury is made also on behalf of adults: The informed person has a right to take risks. Unfortunately, the injuries and psychological and financial burden are not always confined to the person taking the risk.
INJURY RISK
Injury is a common problem. No child or adolescent can be considered free from risk. However, some patterns may be helpful in designing programs or counseling individual patients.
Demographic Issues
Throughout the lifespan, male subjects have higher injury death rates than female subjects. This increased risk is apparent even before the age of 1 year; the total injury death rate for infant boys is approximately 1.3 times the rate for girls. In adolescence, the differential is even more striking, with a male-to-female ratio of approximately 2.8:1.0. The differences appear to reflect differences in likelihood of involvement in hazardous activities. Whether these differences in male behavior are entirely because of socialization (i.e., role expectations) or reflect innate behavioral characteristics specific to boys and men is not clear. Gender differences are greatest for fatal and other severe injuries.
If the full spectrum of injury is considered, rates are highest for both genders during adolescence. The adolescent injury death rate is exceeded only by that for the most elderly segments of the population.
Injury death rates vary with ethnicity and economic status. Native Americans have the highest injury rates of population groups in the United States. Blacks are a second group at particularly high risk. Asian Americans have the lowest rates. Some of the differences by race can be explained by differences in socioeconomic status. Considerable evidence suggests that unintentional injury rates are highest in the lowest-income areas. Unintentional injury death rates fall markedly as the per capita income increases. Whites and blacks of the same income level have approximately the same death rates from unintentional injury.
There are unique injury concerns in children with special health care needs. For example, children with behavior disorders such as attention deficit hyperactivity disorder (ADHD) have been found to have 1.5 times the odds of sustaining injuries than children without behavior disorders. Targeted injury prevention measures can address the increased risk of children with special needs. For instance, children with seizure disorders are at greater risk for drowning and should be supervised closely while taking a bath or swimming; showers should be used instead of baths if privacy concerns prevent direct supervision.
Although homicide rates are highest where the population is most dense, unintentional injury rates are highest in the most remote rural areas. Unlike differences in injury rates by race, disparities by population density do not narrow when adjustments are made for differences in per capita income.
Demographic associations, although they provide interesting clues to the complexity of injury causation and are helpful in program development, do not significantly narrow the task for health care providers. Persons who belong to the higher-risk demographic categories may require extended counseling time and effort, but patients who do not fall into the demographic categories of highest risk cannot be excluded from counseling, because no group is free from all injury risk. Although the concept of the accident-prone person has been popular, evidence has provided no easy rubric for limiting injury control counseling to a small subset of patients. Injury appears to be far too evenly spread across the population to allow any narrow definition of the subpopulation at risk.