A challenge for the Diagnostic and Statistical Manual (DSM) taxonomy has always been to consider developmental differences in the expressions of disorders in different age groups. Research has suggested that individuals of different ages may express features of the same criteria somewhat differently. Furthermore, there may be sufficient differences in the expressions of some disorders to justify an age-related subtype of the disorder. This is important to consider particularly in Posttraumatic Stress Disorder (PTSD) because, although PTSD has been widely reported in children and adolescents, the DSM-IV criteria were developed before substantial numbers of studies had been conducted on young children (1).
The Fifth Edition of the DSM (DSM-5) includes a new developmental subtype of PTSD called Posttraumatic Stress Disorder in preschool children. As the first developmental subtype of an existing disorder, this represents a significant step for the DSM taxonomy. Since an alternative diagnostic set of criteria was initially proposed by Michael Scheeringa and Charles Zeanah (2), the criteria have been refined empirically (3,4), and endorsed by a task force of experts on early childhood mental health (5). While the bulk of the empirical research that supports this disorder was conducted on three- to six-year-old preschool children, the studies often included one- to two-year-old toddlers. These studies showed that when a developmentally-sensitive set of criteria were used approximately three to eight times more children qualified for the diagnosis compared to the DSM-IV (3,6).
Young children are exposed to many types of traumatic experiences, placing them at risk for PTSD. These include:
Because young children have emerging abstract cognitive and verbal expression capacities, research has shown that the criteria need to be more behaviorally anchored and developmentally sensitive to detect PTSD in preschool children (2,13).
The criterion that the children's reactions at the time of the traumatic events showed extreme distress has been deleted. If children were too young to verbalize their acute reactions to traumatic experiences, and there were no adults present to witness their reactions, there was no feasible way to know about these reactions. This criterion, which has been shown to lack predictive validity for both adult (14) and preschool populations (6), has also been deleted for the regular PTSD criteria in DSM-5.
The change to the re-experiencing symptoms is a relatively minor change in wording to increase face validity and, thereby, lower the symptom detection threshold. The old symptom of "recurrent and intrusive distressing recollections of the event ..." required three conditions: (1) recurrent, (2) intrusive, and (3) distressing. Research showed empirically that preschool children do not always manifest overt distress with their intrusive, unwanted thoughts. Some children were neutral or "over bright" (2,13). While distressed reactions are common, parents also commonly reported no affect or what appeared to be excitement (6). Furthermore, there were no differences in PTSD severity for those with overtly distressing recollections compared to those who showed other emotions with their recollections.
Because many of the avoidance and negative cognition symptoms are highly internalized phenomena, the most significant changes in the criteria for preschool children are in this section.
The major change was to require only one symptom in either the avoidance symptoms or negative alterations in cognitions and mood, instead of the DSM-IV threshold of three symptoms. The number of these symptoms that are possible to detect is simply fewer compared to adults. The symptoms of "loss of interests," "restricted range of affect," "detachment from loved ones," and "avoidance of thoughts or feelings related to the trauma" manifest in young children but are consistently ranked as some of the least frequent among the PTSD symptoms (15). The symptoms of "sense of a foreshortened future" and "inability to recall an important aspect of the event" were deleted because of the developmental challenges in manifesting and/or detecting them.
The wording of two symptoms was modified to enhance face validity and symptom detection. Diminished interest in significant activities may manifest as constricted play. Feelings of detachment or estrangement may be manifest more behaviorally as social withdrawal.
Being the most behavioral and observable types of symptoms, few changes seem to be needed for these problems. The symptoms "irritability or outbursts of anger" was modified to include "extreme temper tantrums" to enhance face validity.
Evidence supports the criterion, convergent, discriminant, and predictive validities of the preschool PTSD criteria (reviewed in Scheeringa et al., 2011;6). Perhaps most convincingly, even when the threshold for the avoidance and numbing criterion was lowered from three symptoms to one symptom, the diagnosed cases were still highly symptomatic, with means of 6 to 10 symptoms across studies. Marked functional impairment across a range of domains has also been documented. Prospective longitudinal studies have also documented the longer-term stability of diagnoses and impairment over time (9,16,17).
Standardized screening and assessment instruments have been developed for caregivers of this age group, with both self-administered checklists and diagnostic interviews (reviewed in 18).
Evidence-based treatments for PTSD, such as cognitive behavioral therapy, are effective (7,19,20). A long-term, relationally-based treatment has shown effectiveness following interpersonal violence (8). Play therapy, eye movement desensitization and reprocessing (EMDR), and other modalities may be effective if the traumatic memories can be engaged in developmentally-appropriate methods.
Author Note: Dr. Michael Scheeringa is the Remigio Gonzalez, MD Professor of Child Psychiatry, Tulane University School of Medicine, New Orleans, LA.