Introduction

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Accidents in children are common and in 1996 in the United Kingdom accounted for about two million presentations at accident and emergency departments.¹ Parental reports indicate that most children display emotional distress immediately after an accident, although for most this distress is short lived and comparatively mild. Questionnaires completed by children indicate that some experience higher levels of emotional distress, particularly those involved in road traffic accidents or who have fallen from heights. This distress can persist for several months, although the emotional needs of these children are rarely recognised and seldom receive any ongoing planned intervention.¹

In 1997 the number of road traffic accidents involving young people under the age of 19 years totalled 72 154.² Fatalities and serious injuries accounted for almost 16%, with most suffering physical injuries of mild to moderate severity. Research focusing on adult survivors of road traffic accidents has consistently shown high rates of psychological morbidity, particularly mood disorders, travel anxiety, depression, and post-traumatic stress disorder.^3-5 Although there has been little systematic research into the psychological effects of road traffic accidents on children, there is increasing recognition that they too will be affected. ^{6 7}

Individual case studies detailing the effects of road traffic accidents on children have been described. ^{7 8} Similarly, reports from major traffic accidents indicate that children display considerable psychological reactions and in many cases present with a range of symptoms characteristic of post-traumatic stress disorder. ^{9 10} The diagnostic criteria of this disorder involve the experiencing of a traumatic event that is outside the range of usual human experience. This event results in persistent re-experiencing of the trauma, avoidance of stimuli associated with it, and increased rates of arousal. These symptoms have to persist for longer than 1 month and cause clinically measurable distress or impairment in social, occupational, or other areas of functioning (Diagnostic and Statistical Manual of Mental Disorders, 4th edition (DSM-IV)).¹¹ For young people symptoms may include sleep disturbance and nightmares, separation anxiety, difficulties in concentration, intrusive thoughts, difficulties in talking with parents and friends, mood disturbance, deterioration in academic performance, specific fears, and accident related play.¹²

Much of the research into the effects of traffic accidents on children has been retrospective. It has either described specific individual cases or focused on major accidents involving groups of children. ^{8 13} Individual clinical assessment of the children has not always been undertaken, with studies relying extensively on scores from self administered questionnaires to detect the possibility of post-traumatic stress disorder. ^{9 10 14} The time at which the assessment was undertaken has varied, and the effects of everyday individual traffic accidents have rarely been systematically assessed. ^{14 15} We determined the prevalence of post-traumatic stress disorder by individual clinical assessment of children involved in everyday traffic accidents.

	Methods

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Study cohort
The study was prospective and ran for 12 months from March 1996 to February 1997. The experimental group consisted of children and young people aged 5-18 years who attended the accident and emergency department at the Royal United Hospital, Bath, after a road traffic accident. To control for the possible effects of hospital attendance on psychological distress¹⁶ we recruited a control group of children who experienced unexpected trauma after a sports injury.

Identification of children
The subjects were identified each week from the records in the department. Standard information was collected, including basic demographic details, whether the child was admitted, a proxy measure of severity of injury determined by the Manchester triage priority scale,¹⁷ number of x rays pictures taken, and whether any fractures or blows to the head were identified. The Manchester triage scale is a standardised 5 point priority system designed to ensure that patients are seen in order of clinical need rather than attendance. A rating of 1 indicates that immediate attention is required, a rating of 2 that attention should be given within 10 minutes, while 5 suggests a non-urgent case requiring attention within 4 hours.

Project recruitment
Two weeks after the accident the child and his or her parents were sent an information sheet about the project accompanied by an introductory letter explaining that a researcher would shortly contact them. One week later the family was telephoned, invited to participate in the study, and, if they agreed, a date arranged for the interview.

Assessment
To ensure that children had an opportunity to express openly their own account of the accident they were interviewed when possible without their parents present. Most interviews were conducted alone with the child (68.9%) in his or her own home (86.6%). For younger children this was not appropriate and if a parent was present care was taken to direct all questions towards the child and to minimise parental involvement and question answering.

Semistructured interview
A semistructured interview was developed which incorporated the clinician administered post-traumatic stress disorder scale for children (CAPS-C).¹⁸ This scale systematically assesses each of the diagnostic criteria for post-traumatic stress disorder as detailed by DSM-IV.¹¹ Fulfilment of the criteria requires the presentation of specific symptoms indicating that the traumatic event is regularly re-experienced, that trauma related stimuli are avoided, and that the individual has experienced a measurable increase in arousal. The resulting disturbance has to cause clinically measurable distress or impairment in social or other areas of functioning and persist for longer than 1 month.

Psychometric assessment
The children completed a battery of psychometric assessments that assessed the effect of the trauma (impact of events scale¹⁹), the presence of depression (Birleson depression inventory²⁰), and anxiety (revised manifest anxiety scale²¹). The Birleson depression scale has not been validated on younger children and because of uncertainty regarding the appropriateness of some items it was decided to administer the psychometric assessments only to children over the age of 7.

Researchers
Interviews were conducted by one of four researchers. To standardise the assessment process the researchers worked with each other and conducted a number of joint interviews.

Statistical methods
Categorical data were analysed with non-parametric ² statistics and continuous data by two tailed t tests.

	Results

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Road traffic accident group
A total of 278 children attended the department after involvement in road traffic accidents. One child died, one was in a coma, and one was untraceable at the time of follow up, leaving a study group of 275 children. Of these, 147 refused to be interviewed, although 29 agreed to complete and returned the battery of psychometric assessments. Of the 128 who agreed to participate, 119 were successful interviewed with the nine remaining being out at the agreed appointment time, and further attempts to interview them proved unsuccessful. Therefore 43% of all children involved in road traffic accidents were interviewed between 22 and 79 days after their accident (mean (SD) 40.3 (9.82) days). The diagnosis of post-traumatic stress disorder requires symptoms to persist for longer than 1 month, and three children were interviewed before this time. Data from these children were included in the analysis, although none fulfilled the other diagnostic criteria for the diagnosis for post-traumatic stress disorder. A comparison of children who were interviewed with those who were not is provided in table 1. There were few significant differences between the groups. Interviewees were more likely to require treatment within 10 minutes and to be admitted.

Control group with sports injuries
A control group of children who attended the accident and emergency department after sporting accidents was recruited during the latter part of the 12 month study period. The process of identification, recruitment, and assessment was the same as that used with the road traffic group, with interviews being conducted between 21 and 82 days after the accident (mean (SD) 43.5 (9.57) days). Data from two children who were interviewed within 1 month of their accident were included, although neither fulfilled the other diagnostic criteria for post-traumatic stress disorder.

	Discussion

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Representativeness of interviewed sample
Although only 42.8% of the children involved in road traffic accidents were successfully interviewed, there were few significant differences between those who were or were not interviewed. Their demographic details, type of accident, and nature and severity of physical injuries were similar. Although those interviewed had more urgent triage priority ratings and were more likely to be admitted, our subsequent analysis found that these factors were not associated with the development of post-traumatic stress disorder.

Prevalence of post-traumatic stress disorder
In terms of overall prevalence about one third (35%) of the children interviewed who were involved in road traffic accidents fulfilled the diagnostic criteria for post-traumatic stress disorder. Our data do not indicate any reason to suggest that the prevalence of the disorder in those not interviewed would be different. If it was conservatively assumed that none of the children who refused to be interviewed were suffering from the disorder, however, then at a minimum the prevalence of post-traumatic stress disorder would be 15% (41/278).

Factors associated with development of post-traumatic stress disorder
There were significant sex differences, with girls being more at risk of developing the disorder than boys. These findings are consistent with the literature on childhood trauma.²² Neither the type of incident nor nature and severity of physical injuries were related to the degree of psychological distress. A number of children with the disorder were involved in comparatively minor accidents, suggesting that this condition is not confined to major incidents or disasters. The personal meaning of the event for the child was, however, important, and previous experience of trauma and appraisal of threat to life were significantly related to the development of post-traumatic stress disorder. This is consistent with other research which highlights the central role of psychological factors in the development of post-traumatic stress disorder.²²

Psychological problems in children suffering sports injuries
Road traffic accidents resulted in greater psychological distress than unexpected traumas such as sports injuries. Of children involved in traffic accidents, 35% suffered severe psychological effects compared with 3% of those who suffered sports injury. This would confirm the results of previous studies that road traffic accidents generate more severe and prolonged emotional distress than other types of accidents.¹

Conclusions
Post-traumatic stress disorder is a controversial diagnosis, and some researchers have argued that the reactions of children to traumatic events are temporary and comparatively minor.²³ The basis for this argument has been contested, and there is now increasing evidence that children are considerably affected in a similar way to adults.²⁴ Post-traumatic stress disorder refers only to a defined set of symptoms, however, and does not encompass other important although less severe trauma reactions or other disorders associated with traumatic events, particularly anxiety and depressive disorders. The results reported here are therefore limited but nevertheless show that significant psychological distress about 6 weeks after everyday road traffic accidents is comparatively common.