Interviewer effects on epidemiologic diagnoses of posttraumatic stress disorder

Military Combat, Posttraumatic Stress Disorder, and the Course of Alcohol Use Disorders in a Cohort of Australian Vietnam War Veterans

The present study examined the course of diagnosed alcohol use disorders (AUDs) in a cohort of Australian veterans of the Vietnam War (N = 388) who were assessed 22 and 36 years after returning home. Standardized interviews provided data on AUDs, posttraumatic stress disorder (PTSD), other psychiatric diagnoses, and combat exposure. Overall, 148 veterans (38.1%) had no history of alcohol-related diagnoses, 151 veterans (38.9%) had a past AUD diagnosis that was not current at the second assessment point, and 89 veterans (22.9%) had a current AUD diagnosis at the second assessment. Less education, lower intelligence test scores, and misconduct were individual risk factors for AUDs, as were first-interview diagnoses of PTSD, antisocial personality disorder, generalized anxiety, and dysthymia, but not depression; these variables were all nonsignificant after controlling for combat exposure and PTSD. Multinomial regression was used to assess the relative contributions of combat exposure and PTSD to the course of AUDs. Combat exposure and PTSD had different patterns of association with AUDs whereby combat exposure, but not PTSD, was associated with a history of AUDs, odds ratio (OR) = 1.02, but not with current AUDs, whereas PTSD, but not combat exposure, was associated with current AUDs, OR = 3.37. Current numbing and avoidance symptoms were associated with current AUDs, OR = 4.48. The results do not support a mutual maintenance model of PTSD and AUDs but are consistent with a self-medication model, which suggests treatment for PTSD may have beneficial effects on AUDs.

Impact of childhood exposure to a natural disaster on adult mental health: 20-year longitudinal follow-up study

BACKGROUND

Studies examining the impact of childhood disaster exposure on the development of adult psychopathology report increased rates of post-traumatic stress disorder (PTSD) and other psychopathology.

AIMS

To examine the rates of PTSD and other lifetime DSM-IV disorders in adults exposed to an Australian bushfire disaster as children in 1983 using a matched control sample recruited at the time of the original study.

METHOD

A total of 1011 adults recruited from an original sample of 1531 were assessed 20 years following the fires using the Composite International Diagnostic Interview (CIDI-2.1).

RESULTS

Results showed only a small direct impact of the fires on adult psychiatric morbidity. A higher proportion of bushfire survivors met criteria for 'any DSM-IV disorder' and ;any anxiety'.

CONCLUSIONS

Findings suggest that the long-term impact of a prominent trauma in childhood should be assessed in the context of other lifetime trauma in order to provide a more accurate account of PTSD prevalence rates.

Reconciling disparate prevalence rates of PTSD in large samples of US male Vietnam veterans and their controls

BACKGROUND

Two large independent studies funded by the US government have assessed the impact of the Vietnam War on the prevalence of PTSD in US veterans. The National Vietnam Veterans Readjustment Study (NVVRS) estimated the current PTSD prevalence to be 15.2% while the Vietnam Experience Study (VES) estimated the prevalence to be 2.2%. We compared alternative criteria for estimating the prevalence of PTSD using the NVVRS and VES public use data sets collected more than 10 years after the United States withdrew troops from Vietnam.

METHODS

We applied uniform diagnostic procedures to the male veterans from the NVVRS and VES to estimate PTSD prevalences based on varying criteria including one-month and lifetime prevalence estimates, combat and non-combat prevalence estimates, and prevalence estimates using both single and multiple indicator models.

RESULTS

Using a narrow and specific set of criteria, we derived current prevalence estimates for combat-related PTSD of 2.5% and 2.9% for the VES and the NVVRS, respectively. Using a more broad and sensitive set of criteria, we derived current prevalence estimates for combat-related PTSD of 12.2% and 15.8% for the VES and NVVRS, respectively.

CONCLUSION

When comparable methods were applied to available data we reconciled disparate results and estimated similar current prevalences for both narrow and broad definitions of combat-related diagnoses of PTSD.

Social attitudes toward traumatized men and women: a vignette study

This study investigated social beliefs about gender-appropriate reactions to trauma. Ninety-three men and 179 women completed vignette measures of attitudes toward victims, the Bem Sex Role Inventory, and the Trauma History Questionnaire. Participants evaluated male victims less favorably than female victims. Women responded more positively toward all victims than men. Participants regarded female crime victims more positively than their male counterparts, but did not distinguish between male and female natural disaster victims. Feminine-sex-typed women rated victims more favorably than masculine-sex-typed individuals. There was a positive relation between personal trauma exposure and attitudes toward male victims among male participants. These findings contribute to an understanding of factors influencing the social reactions experienced by traumatized men and women, and have implications for clinical practice and psychoeducation.

The weaker sex? Gender and post-traumatic stress disorder

We discuss the gender-specific differences for traumatic events and Post-Traumatic Stress Disorder (PTSD) as found in the epidemiological literature. Recent research literature consistently reports three interesting findings: 1) men experience traumatic events more often, 2) women and men differ in the type of traumatic experiences they experience, and 3) women more often develop PTSD after the experience of a traumatic event. In the second part of the present article we provide some explanations for these differences. The reported higher vulnerability of women for PTSD could be due to the methodology used, the higher prevalence of childhood sexual abuse and rape in women, the different coping styles of women and men, or the more limited socio-economic resources of women.

The prevalence of posttraumatic stress disorder among American Indian Vietnam veterans: disparities and context

This study employed data from two Congressionally mandated efforts (the American Indian Vietnam Veterans Project and the National Vietnam Veterans Readjustment Study) to examine differential prevalence of posttraumatic stress disorder (PTSD) among 5 ethnically defined samples of male Vietnam theater veterans. Lay interviews assessed individual experiences before, during, and after the war from 1,798 male Vietnam theater veterans. Clinical reinterviews using the SCID were conducted with subsamples (N = 487). The prevalence of both 1-month and lifetime PTSD was higher for the 2 American Indian samples than for Whites. Once logistic regressions controlled for differential exposure to war-zone stress, ethnicity was no longer a significant predictor of PTSD.

Distress experienced by participants during an epidemiological survey of posttraumatic stress disorder

We examined the potential for epidemiological studies of mental disorders, specifically of posttraumatic stress disorder (PTSD), to cause further harm to participants involved. Of 1,000 randomly selected Australian Vietnam veterans, 641 agreed to participate in an epidemiological survey. Participants were asked about distress experienced during the interview when traumatic events were raised. Significant distress attributed to the interview was reported by 75.3% of those with current PTSD, 56.5% of those with past PTSD, and 20.6% of those with no PTSD diagnosis. Distress did not affect participants' use of medical services following the interview nor did it affect their willingness to continue participating in the study. We concluded that research interviews about PTSD may cause short-term distress, but found no evidence of long-term harm.

Gender differences in susceptibility to posttraumatic stress disorder

We examined data from a community survey of trauma exposure and DSM-IV PTSD in Winnipeg, Canada to explore factors associated with the higher rate of PTSD in women than men. Women were found to be at significantly increased risk for PTSD following exposure to serious trauma (odds ratio approximately 5), even when sexual trauma--which predominates in women--was excluded (odds ratio approximately 3). Adjusting for gender differences in the number of lifetime traumata, or in the likelihood of the trauma being associated with particular reactions to or consequences of the event (i.e. thinking that one would be killed or seriously injured; sustaining a serious physical injury; seeing someone else seriously injured or killed) did not result in a lessening of the PTSD risk in women. Women were found to be at increased risk for PTSD following nonsexual assaultive violence (e.g. mugging or other physical attack) but not following non-assaultive trauma (e.g. fire, witnessing injury to others). Understanding the basis of (and parameters for) this increased susceptibility to PTSD in women compared to men following trauma exposure should be a priority for future traumatic stress research.

Combat, dissociation, and posttraumatic stress disorder in Australian Vietnam veterans

The specificity of various wartime stressors for different posttraumatic stress disorder (PTSD) symptoms is inconsistently reported in the literature. Combat, wounding, and peritraumatic dissociation have not been assessed together in their effects on each of the various PTSD symptom clusters. This cohort study of a random sample of male Australian Army Vietnam veterans yielded psychiatric assessments of 641 subjects. PTSD measures comprised symptom criteria for reexperiencing, numbing and avoidance, hyperarousal, and PTSD diagnosis both lifetime and current within the past month. Logistic regression is used to examine the effects of combat, wounding, and peritraumatic dissociation together on PTSD. Combat experiences comprised four components derived from a principal components analysis of combat experiences: direct combat exposure, exposure to death and injury, exposure to civilian death and injury, and exposure to mutilation. Each was differentially related to reexperiencing, avoidance, hyperarousal, and PTSD diagnosis. Being wounded was not related to lifetime or current PTSD and peritraumatic dissociation was related to all diagnostic components of PTSD in the presence of other variables.

Posttraumatic stress disorder and comorbidity in Australian Vietnam veterans: risk factors, chronicity and combat

OBJECTIVE

The objective of this study was to examine the relationship between combat-related posttraumatic stress disorder (PTSD) and comorbid DSM-III-R psychiatric diagnoses to determine commonalities in risk factors, relative onsets and the role of combat exposure.

METHOD

An epidemiological cohort study using standardised psychiatric, social and health interviews was undertaken with a national random sample of male Australian Army Vietnam veterans. Interviews and searches of military records yielded risk factors for PTSD, which were examined for association with each psychiatric diagnosis. Relative onsets of PTSD and each Diagnostic Interview Schedule diagnosis were compared. Comorbidity odds ratios were adjusted for combat exposure effects using logistic regression, and the relation between each diagnosis and combat was assessed after controlling for PTSD.

RESULTS

Commonality of risk factor profile was evident for several diagnoses, and for many their onset preceded PTSD onset. Combat was independently related to only a few diagnoses after controlling for PTSD, and PTSD remained strongly associated with several conditions after controlling for combat exposure.

CONCLUSIONS

The analysis suggests that the disorders that may constitute risk factors or vulnerabilities for PTSD comprise depression and dysthymia, antisocial personality disorder, agoraphobia and simple phobia, while those that may be consequent on PTSD are panic and generalised anxiety disorder, drug use disorders and somatoform pain disorder. Alcohol and drug use disorders and social phobia may have a mixed aetiology, while obsessive-compulsive disorder may be serendipitously related to PTSD through an association with risk of combat. Gambling disorder is unrelated.

Help-seeking in Vietnam veterans: post-traumatic stress disorder and other predictors

This study investigated factors predicting help-seeking from the Department of Veterans' Affairs (DVA) by Vietnam veterans. Data used were from a national Australian survey of Vietnam veterans' health (n = 641) conducted between July 1990 and April 1993. The survey involved current clinical assessments and retrospective questionnaires, supplemented with health and service records retrieved from the DVA and Army personnel files. Measures included the 1989-90 Australian Bureau of Statistics Health Survey questionnaire, and mental health, sociodemographic and operational deployment history questionnaires. For both current and lifetime diagnoses of post-traumatic stress disorder, a third of the veterans with the disorder had never obtained any health care entitlement from the DVA. Other than physical and mental problems, which accounted for the greatest proportion of the help-seeking odds, significant factors predicting help-seeking included factors such as: predeployment personality, combat exposure, the veterans' own attitudes towards their deployment, experiences during deployment, experiences during repatriation and membership of ex-service organisations. These findings on how post-traumatic stress disorder and other health problems relate to help-seeking patterns could help in developing prevention and care programs for stress disorder.

Australian Vietnam veterans: factors contributing to psychosocial problems

OBJECTIVE

The objective of the present paper is to present comprehensive models of the current psychosocial morbidity of Australian Vietnam veterans. Seldom has research in this area attempted to 'untangle' direct and indirect influences on current functioning via possible pre-army, Vietnam and homecoming pathways.

METHOD

The Australian Vietnam Veterans' Health Study gathered data on a sample of 641 veterans throughout Australia drawn randomly from army Vietnam tour lists of the era. The data arose from interview and army records of the era, and fall into four temporal categories: pre-army, Vietnam service, homecoming after Vietnam, and current state. Path analysis models of the veterans' current psychological morbidities and social wellbeing are used to identify direct aetiological influences of earlier era constructs on current state, free of confounding by indirect (often selection) effects.

RESULTS

Our results indicate that psychological morbidity (particularly posttraumatic stress disorder) is largely influenced by combat and poor homecoming experiences, although pre-military characteristics do play some direct roles in symptomatology. Social dysfunction measures show smaller effects of the Vietnam War, which may be accounted for by an indirect association with Vietnam-related psychological morbidity. Some social measures show evidence of compensatory influences of combat, high combat leading to social dysfunction because of morbidity, but simultaneously being associated with healthier social disposition (possibly because of increased exservice activity).

CONCLUSIONS

For Australian Vietnam veterans, combat-related and homecoming effects persist on a range of psychosocial endpoints 20-30 years after exposure. These effects are not explicable in terms of veterans pre-Vietnam characteristics.