Factor analysis of the impact of event scale with children in war

To evaluate the psychometric properties of the Impact of Event Scale (IES scale) in children a study was conducted on 1787 children exposed to the warfare in Croatia, Bosnia and Herzegovina. The study group comprised 877 girls and 910 boys ranging in age from 6 to 15 years attending 28 arbitrary selected schools in Zagreb. High levels of posttraumatic reactions were found in the group of children. The pattern of endorsement and the factor structure of the IES scale were similar to that found in other samples. This supports the use of the IES in the assessment of posttraumatic stress reactions in children. Two factors emerged from a Principal Component Analysis, labeled intrusion (9 items), and avoidance (4 items). As in other studies, this study documented problems with several items (items 2, 12 and 15), items that should be considered omitted from the IES. Girls reported significantly more distress on 13 out of the 15 items. Both the overall IES score as well as the intrusion and avoidance score were significantly higher in girls than boys. The factor structure for boys and girls were very similar, and the reliability of the scale was adequate across different age groups and for subgroups of displaced and refugee children.     

Using the Impact of Event Scale to Evaluate Psychological Response to Being a Phenylketonuria Gene Carrier

The birth of a child with phenylketonuria (PKU) is almost always a shock to the parents, who are faced with the realities of caring for a child with special needs and the need to cope with the realization that they are obligate carriers of the responsible gene. The Impact of Event Scale (IES) was used to assess the psychological impact of being a PKU gene carrier on 83 parents of children with PKU. IES scores decreased significantly from the time of initial diagnosis of PKU to the current time. The magnitude of the psychological impact did not correlate with the age of the parent, the number of years since the diagnosis of PKU, or the health or development of the child. As more tests become available for detecting the presence of disease-related genes, instruments such as the IES may prove useful in the evaluation of psychological responses to genetic information.     

Obtaining separate measures for implicit and explicit memory

In this paper a new model, the Implicit/Explicit Separation (IES) model, is developed and applied. The model is designed to obtain separate probability measures for explicit memory storage, implicit memory storage, fractional storage, and non-storage. The model is needed because memory research has shown the importance of the distinction between a conscious memory of a target event and a memory residue that is unable to support conscious recall or confident recognition, but it is still able to support guessing at rates above chance. Maximum likelihood and population-parameter mapping estimates for the parameters of the IES model are provided. The accuracy of parameter estimates is studied as a function of sample size. Three experiments are reported to demonstrate how the IES model is used to achieve a more fine grained assessment of the quality of information storage. These experiments also provide strong validation support for the IES model itself. Across the three experiments, each of the four components for representing target information (explicit, implicit, fractional, and non-storage) demonstrates a different pattern. The IES model is discussed in terms of alternative models such as the dual-process model and the process-dissociation model.     

Psychiatric distress and symptoms of PTSD among victims of bullying at work

Distress and symptoms of Post-Traumatic Stress Disorder (PTSD) were investigated among targets of experienced bullying at work, that is, the exposure to persistent or recurrent oppressive, offensive, abusive behaviour where the aggressor may be a superior or a colleague. The participants in the present study were all recruited from two associations of bullied victims (n=102, response rate=57%). A high level of distress and symptoms of PTSD was revealed in the sample, both according to recommended cut point scores for HSCL-25, PTSS-10 and IES-R, and when comparing the sample with traumatised samples. Three out of four victims reported an HSCL-25 level higher than the recommended threshold for psychiatric disease. Sixty and 63% of the sample reported a high level of IES intrusion and IES avoidance, correspondingly. The level of bullying, operationalised as the frequency of negative acts the individual had been exposed to at work, showed a stronger interconnection with distress and PTSD than a more unspecified, subjective measure of bullying, as well as the time since the bullying took place and the duration of the bullying episode. Those still being pestered reported a higher level of distress and PTSD than victims in which the bullying episodes were terminated more than 1 year ago, but the findings were somewhat mixed. Positive affectivity (PA) and especially negative affectivity (NA) contributed significantly to the explained variance of distress and PTSD in various regression analysis models, but did not interact with measures of bullying. Nor were mediator effects found between bullying, PA/NA and traumatic stress reactions. Implications of the findings are discussed.     

Do gains in working memory capacity explain the written self-disclosure effect?

Klein and Boals (2001) concluded that expressive writing about negative life events improves health by reducing intrusive thoughts, as measured by the Impact of Events Scale (IES), and thus freeing working memory (WM) capacity. We replicated their WM gain and rejected the possibility that it reflected task practice alone. We extended their work by showing that such WM effects and reductions in self-reported health symptoms can be observed within a short time frame of a week in a normal population of college students and can occur without reductions in IES scores. Two alternative explanations are discussed of how WM gains can be observed in the written self-disclosure effect without reductions in the frequency of intrusive thoughts and avoidance attempts.     

The Göteborg discothèque fire, 1998

Findings from a study of 563 adolescents’ reactions following a discotheque fire that killed 63 young people in Göteborg in October 1998 are presented. The group answered a questionnaire seven months following the disaster. The questionnaire included the Impact of Event Scale (IES) and the Birleson Depression Self‐Rating Scale (DSRS). The level of trauma was found to be very high, while depression scores were less elevated. A little under a third of the students scored above a clinical cut‐off point (> 35) on the IES, indicating high posttraumatic stress levels. Girls evidenced more depression and traumatic stress reactions than boys. Levels of reactions increased with more closeness (knowing victims personally) and if the adolescents were of non‐Swedish origin.     

Construct validation of the Dutch version of the impact of event scale

The Impact of Event Scale (ES; M. J. Horowitz, N. Wilner, & W. Alvarez, 1979) is a worldwide-used self-report measure to assess the frequency of intrusive and avoidant phenomena after a variety of traumatic experiences. The purpose of this article is to assess the psychometric value of the Dutch version of the IES (D. Brom & R. J. Kleber, 1985) in several samples of individuals who had experienced various traumatic stressors. The reliability and structure of the IES were evaluated in 3 different samples (total N = 1.588). The reliability of the Dutch version of the IES was adequate across the various stressors. The construct validity was assessed by using confirmatory factor analyses. Outcomes revealed a robust structure over the various samples, generally supporting the composition of the original IES.     

Trauma-related sequelae in individuals with a high level of dental anxiety. Does this interfere with treatment outcome?

This study assessed trauma-related sequelae of 56 highly anxious patients attending a dental fear clinic. It was also examined whether such symptomatology interferes with anxiety reduction in response to a cognitive-behavioral treatment approach. About 34 patients (59%) indicated that they had experienced one or more aversive dental events that could explain the onset of their dental anxiety. There was no difference between the dental anxiety scores of patients who reported such a background and those who did not. Severity of trauma-related symptomatology was indexed by the Impact of Event Scale (IES). The mean IES score of patients with a traumatically induced dental fear was remarkably high (33.0; SD=19.7). Furthermore, there was a strong direct relationship between severity of trauma-related symptomatology and severity of dental anxiety (shared variance was 38%). Two patients (10%) met all DSM-IV diagnostic criteria for Posttraumatic Stress Disorder (PTSD) on the basis of the Self-Rating Scale for PTSD. However, no evidence was found to suggest that either a traumatic background, or level of trauma-related symptomatology, has a negative effect on treatment outcome.     

Screening for Posttraumatic Stress Disorder: an evaluation of two self-report scales among crime victims

The validity of the Impact of Events Scale (IES) and the Posttraumatic Stress Disorder (PTSD) Symptom Scale, Self-Report version (PSS-SR) was examined among crime victims. Both instruments performed well as screeners for PTSD. For the IES, sensitivity ranged between .93 and 1.00; for the PSS-SR, sensitivity ranged between .80 and .90. Specificity for the IES ranged between .78 and .84 and for the PSS-SR ranged between .84 and .88. Some individual items from the 2 scales performed just as well as the total scales. The authors conclude that either of these short self-report instruments or their individual items are suitable as screeners for PTSD, specifically in settings where mental health professionals are unavailable. Cross-validation of these results is necessary because of the small sample size in this study.     

Assessing the impact of stressful incidents in organizations: the development of an extended impact of events scale

Employers are becoming increasingly aware of the risks to employee wellbeing associated with the traumatic incidents that occur in the workplace. Despite this increased organizational awareness of the need to protect employees from the damaging effects of traumatic events, there has been little provision to help organizations to evaluate their management systems and post trauma interventions. This problem of a lack of evaluation has become more important as a growing body of evidence has provided evidence that suggests that trauma debriefing, the widely used approach to traumatic stress may be ineffective or damaging. The problem for an organization is to have a means of assessing the impact of a traumatic incident on exposed employees soon after the event and at regular intervals as a way of tracking the effectiveness of the treatment and rehabilitation programme. This paper examines the development and validation of a traumatic stress questionnaire designed to be used by trained practitioners working with traumatized employees. The extended impact of events scale (IES-E), took the 15 items from the impact of events scale (IES) and added eight new items which had been chosen on the basis of existing theory and clinical experience to represent the traumatic stress symptom of hyperarousal. Two studies are reported which examine the structure and reliability, and then the discriminant validity of the extended scale when used with a working population. The first study involved a factor analysis of the IES-E items using data collected from 105 subjects who had formally reported exposure to stressful work events to their employing organization. The second study then used the IES-E to compare employees self-reporting of the impact of either a major positive or a major negative life event. The results of the first study confirmed the presence of the re-experience and avoidance symptoms as a response to a traumatic event (as in the IES) but, in addition, identified a new factor, arousal and a new measurement model based on a single general factor. The reliability coefficients for all three scales and the general factor were found to be good. The second study showed that IES-E scores on re-experience, avoidance, arousal and the general factor could be used to discriminate between the subjects reporting major positive and negative life events. Two measurement models can therefore describe the impact of stressful events, the first based on three orthogonal factors, and the second based on a single general factor. The theoretical implications of these findings are explored.     

Measuring post-traumatic stress: A psychometric evaluation of symptom- and coping questionnaires based on a Norwegian sample

The purpose of this study was to evaluate the psychometric characteristics of the Norweigian versions of the Impact of Event Scale, the Post Traumatic Stress Scale-10 item version and General Coping Questionnaire-30 item version. A group of 40 male and 56 female medical students was tested one week and four months after having started dissection of cadavers for the first time. The results showed that all scales had good internal consistency and test-retest reliability. The student sample scored lower on the IES and PTSS-10 than comparable groups of traumatized subjects. A gender difference emerged, with female subjects scoring higher than male subjects. The factor analysis of the instruments indicated good construct validity for the symptom scales. The analysis of content validity related to DSM IV criteria indicated that the IES and PTSS-10 may have some limitations in their predictive validity of PTSD. Taken together, the three scales have shown good psychometric properties and could be used in future research and clinical work.     

Reaction to trauma: a cognitive processing model.

We integrated existing cognitive processing models of posttrauma reactions into a longitudinal model. Data were obtained after a multiple shooting in a city office block. The subject group comprised 158 office workers who were in the building at the time of the shootings. The methodology of this research was a repeated measures survey, with data collection at 4, 8, and 14 months posttrauma. Measures included the Impact of Events Scale (IES) and the Symptom Checklist-90-Revised. A path analysis was performed with the IES as an indication of cognitive processing. Intrusion and avoidance were shown to mediate between exposure to trauma and symptom development. Intrusion was also found to be negatively related to subsequent symptom levels. The findings provide provisional support for a cognitive processing model.     

Psychological Distress and Symptoms of Posttraumatic Stress Disorder in Jewish Adolescents Following a Brief Exposure to Concentration Camps

We investigated the psychological impact of an organized visit to Polish concentration camps on Jewish-American adolescents. Eighty-seven adolescents who participated in a B'nai B'rith memorial visit to concentration camps in Poland completed measures of general psychological adjustment and posttraumatic stress disorder (PTSD) at four time-points: pretest, posttest, 6-month follow-up and 12-month follow-up. Measures included the SCL-90-R, the Mississippi Scale for PTSD, and the Impact of Events Scale (IES) for PTSD. On the SCL-90-R, changes in somatization, interpersonal sensitivity, obsessive-compulsive tendencies, depression, anxiety, and phobic anxiety were observed over time, with peak symptom scores at posttest and 6-month follow-up. Scores on the Mississippi Scale for PTSD and the IES Intrusion subscale also increased at 6-months. Predictors of PTSD symptoms on the Mississippi Scale included previous psychiatric treatment and SCL-90-R symptoms of paranoia, depression, and psychosis. Elevated psychotic symptoms on the SCL-90-R predicted PTSD symptoms on the IES. Jewish adolescents with preexisting symptoms of generalized distress or psychoticism appeared at increased risk for PTSD symptoms following exposure to Holocaust stimuli. This study contributes a prospective, multi-measure assessment of trauma reactions in adolescents.     

Reducing depressive intrusions via a computerized cognitive bias modification of appraisals task: Developing a cognitive vaccine

A feature of depression is the distressing experience of intrusive, negative memories. The maladaptive appraisals of such intrusions have been associated with symptom persistence. This study aimed to experimentally manipulate appraisals about depressive intrusions via a novel computerized cognitive bias modification (CBM) of appraisals paradigm, and to test the impact on depressive intrusion frequency for a standardized event (a depressive film). Forty-eight participants were randomly assigned to either a session of positive or negative CBM. Participants then watched a depressing film (including scenes of bereavement and bullying) and subsequently monitored the occurrence of depressive intrusions related to the film in a diary for one week. At one-week follow-up, participants completed additional measures of intrusions – the Impact of Event Scale (IES) and an intrusion provocation task. As predicted, compared to the negative condition, participants who underwent positive CBM showed a more positive appraisal bias. Further, one week later, positive CBM participants reported fewer intrusions of the film and had lower IES scores. Our findings demonstrate that it is possible to manipulate maladaptive appraisals about depressive intrusions via a computerized CBM task. Further, this effect transfers to reducing intrusive symptomatology related to a standardized event (a depressive film) over one week, suggesting novel clinical implications.     

The effects of task duration and work-session location on performance degradation induced by sleep loss and sustained cognitive work

Studies attempting to estimate the degree of performance degradation resulting from sleep loss typically use relatively long-duration tasks that are distinctly separate from ongoing activities. Since long-duration tasks are not practical for assessing the performance degradation induced by sleep loss in field settings, this study was designed to examine whether the results of short-duration (1-min) tasks were markedly different from those of long-duration (10-min) tasks with respect to detecting performance changes during a 54-h period of sleep loss and sustained cognitive work. Performance changes also were examined as a function of the location of tasks within work sessions by comparing performance on 1-min tasks that were placed within work sessions with those tasks that immediately followed short rest periods. The results showed that short-and long-duration tasks were equally sensitive to sleep loss. In addition, once sleep-deprivation effects began to emerge, it was found that performance on short-duration tasks within work sessions showed significantly more impairment than performance on tasks that followed rest breaks. These results suggest that task duration is not a critical factor for detecting performance degradation induced during continuous work experiments but that the location of tasks within work sessions is critical for accurately assessing expected performance.     

A confirmatory factor analysis of the Impact of Event Scale using a sample of World War II and Korean War veterans

This study assessed the factor structure of the Impact of Event Scale (IES), a measure of intrusion and avoidance, using a sample of World War II and Korean War veterans who had experienced combat 40-50 years earlier. A series of 3 confirmatory factor analytic models were specified and estimated using LISREL 8.3. Model 1 specified a 1-factor model. Model 2 specified a correlated 2-factor model. Model 3 specified a 2-factor model with additional cross-factor loadings for Items 2 and 12. Model 3 was found to fit the data. In addition, this model was found to be a better explanation of the data than the other models. Also in addition, the correlations between the Intrusion and Avoidance factors and the 4 subscales of the 28-item General Health Questionnaire were examined to determine the distinctiveness of the two IES factors.     

Farm women/farm work

The lack of documentation of women's farm work makes it difficult to assess women's contributions to farm businesses. A survey of farm women in western Canada showed that while younger women were more likely to have a farm work role, they also saw more barriers to farm work than older women. Variations in women's farm work may be a result of cohort differences in socialization for farm work, of farm cycle, or of family cycle. Incorporation of off-farm and household work into the analysis of women's contributions to the farm business is suggested as a more comprehensive method of assessing their work involvement.This research was funded by The Research Council of Alberta Farming for the Future.     

Characteristic individual reactions to preferred and unpreferred environments1

Intercorrelations among measures of various reactions to a large number of situations were factor analyzed and yielded five factors and corresponding measures. Three of the factors are positively intercorrelated and constitute various aspects of approach-avoidance to a situation: approach to the setting itself; approach to tasks in the setting, or desire to work; and approach to persons in the setting, or desire to affiliate. The positive correlation of a fourth, desire to drink alcohol factor with the approach factors suggests that, at least for our sample of average (nonalcoholic) subjects, drinking is more likely to occur in more preferred places. In the context of earlier findings on alcohol use, these results show the decision to drink and the specific choice of a place to drink to be similarly motivated: the consumption of moderate doses of alcohol yields a more preferred emotional state, as does the choice of a preferred setting in which to drink. Additional results relating to characteristic individual reactions showed that Stimulus Screening is useful for assessing differences in individual reactions to unpreferred situations (nonscreeners approach, work, and affiliate less than screeners in such settings). Further, a new questionnaire measure of Arousal Seeking Tendency reported in this study is useful for assessing differences in individual reactions to preferred situations (high-arousal seekers approach, work, and affiliate more than low-arousal seekers in preferred settings).     

Effects of excessive Internet use on undergraduate students in Pakistan.

This study was undertaken to investigate the positive and negative effects of excessive Internet use on undergraduate students. The Internet Effect Scale (IES), especially constructed by the authors to determine these effects, consisted of seven dimensions namely: behavioral problems, interpersonal problems, educational problems, psychological problems, physical problems, Internet abuse, and positive effects. The sample consisted of 200 undergraduate students studying at the GC University Lahore, Pakistan. A set of Pearson Product Moment correlations showed positive associations between time spent on the Internet and various dimensions of the IES indicating that excessive Internet use can lead to a host of problems of educational, physical, psychological and interpersonal nature. However, a greater number of students reported positive than negative effects of Internet use. Without negating the advantages of Internet, the current findings suggest that Internet use should be within reasonable limits focusing more on activities enhancing one's productivity.     

Assessing knowledge-intensive work environment: General versus situation-specific instruments

The aim of the present study is to examine to what extent general and situation-specific work environment instruments capture the salient work characteristics in a knowledge-intensive context. We conducted qualitative open-ended interviews with 30 employees (24 men and six women) from a Norwegian university department. The information from the interviews was content-analysed and coded on the scales of five work environment instruments; two general instruments (the General Nordic Questionnaire for Psychological and Social Factors at Work [QPSNordic] and the Job Diagnostic Survey [JDS]) and three situation-specific instruments (Assessing the climate for creativity [KEYS], Situational Outlook Questionnaire [SOQ], and the Organizational Climate Measure [OCM]). The results showed that situation-specific work environment instruments covered significantly more statements about the work environment than the general instruments. More statements could be categorized on the organization and individual levels, compared to group and leadership levels. The situation-specific instruments covered more statements than general instruments at the organization level. These statements were mainly related to the organizational context, social and relational characteristics, and encouragement of creativity and organizational impediments to creativity. The findings support the value of situation-specific instruments for assessing the work environment in knowledge-intensive organizations.