Correlates of posttraumatic stress disorder symptoms in Marines back from war

An exploratory domain analysis of deployment risks and protective features and their association to mental health, cognitive functioning and job performance in military personnel

BACKGROUND

Meta-analyses of military deployment involve the exploration of focused associations between predictors and peri and post-deployment outcomes.

OBJECTIVE

We aimed to provide a large-scale and high-level perspective of deployment-related predictors across eight peri and post-deployment outcomes.

DESIGN

Articles reporting effect sizes for associations between deployment-related features and indices of peri and post-deployment outcomes were selected. Three-hundred and fourteen studies (N = 2,045,067) and 1,893 relevant effects were retained. Deployment features were categorized into themes, mapped across outcomes, and integrated into a big-data visualization.

METHODS

Studies of military personnel with deployment experience were included. Extracted studies investigated eight possible outcomes reflecting functioning (e.g., post-traumatic stress, burnout). To allow comparability, effects were transformed into a Fisher's Z. Moderation analyses investigating methodological features were performed.

RESULTS

The strongest correlates across outcomes were emotional (e.g., guilt/shame: Z = 0.59 to 1.21) and cognitive processes (e.g., negative appraisals: Z = -0.54 to 0.26), adequate sleep on deployment (Z = -0.28 to - 0.61), motivation (Z = -0.33 to - 0.71), and use of various coping strategies/recovery strategies (Z = -0.25 to - 0.59).

CONCLUSIONS

Findings pointed to interventions that target coping and recovery strategies, and the monitoring of emotional states and cognitive processes post-deployment that may indicate early risk.

Prison Adjustment Among Military Veterans: The Impact of Traumatic Events, Service History, and PTSD

Military veterans have been shown to differ demographically from non-veterans in the criminal justice system. However, relatively little is known about their psychological adjustment, institutional misbehavior, and the efficacy of programing received while incarcerated. Using data taken from a national sample of prison inmates, this study investigates how traumatic events experienced during military service can impact the intensity of negative affect among veterans. Additionally, we examine whether prison misconduct is influenced by military service history and the receipt of substance abuse treatment. Controlling for a host of relevant variables, our results indicate that traumatic events show a significant effect on psychological adjustment only indirectly through veterans who developed post-traumatic stress disorder and that misconduct is lower among those who received an honorable discharge. Overall, these findings suggest that the ability of veterans to resist adverse outcomes may depend on a variety of factors both within and outside the prison environment.

Experiential avoidance, uncompassionate self-responding, and peritraumatic depersonalization/derealization: A novel mediation model for war-related PTSD symptomatology

OBJECTIVE

To explore a novel model for war-related posttraumatic stress disorder (PTSD) symptomatology including emotion regulation processes, namely experiential avoidance (EA) and uncompassionate self-responding (USR), mediating the impact of childhood threat memories, combat exposure distress, combat and noncombat threats, and peritraumatic depersonalization/derealization (PDD) on PTSD symptomatology.

METHOD

A sample of 650 male Portuguese Overseas War veterans filled self-report instruments.

RESULTS

The model explained 59% of the variance of PTSD symptomatology. Both EA and USR mediated the effects of noncombat threats and PDD on PTSD. Additionally, EA mediated combat exposure distress and USR mediated childhood threat memories. Combat exposure distress, combat and noncombat threats, and PDD showed direct effects on PTSD symptomatology.

CONCLUSION

The findings help to better understand the relationship between predictive factors of war-related PTSD in clinical and research settings, providing novel insights on the effects of combat exposure distress, and the different effects of combat and noncombat-related threats on PTSD.

Genetic and Psychosocial Risk Factors Associated with Suicide Among Community Veterans: Implications for Screening, Treatment and Precision Medicine

Introduction

Since veteran suicide is a concern and our knowledge of predictive factors is still limited, our objective was to assess risk factors for suicide, including genetic factors, among deployed veterans.

Methods

For this study, we surveyed 1730 veterans who were outpatients in a multi-hospital system in Pennsylvania. Altogether, 1041 veterans (60%) provided a DNA sample. The genetic risk variants investigated were within loci previously associated with PTSD and substance misuse, including CRHR1, CHRNA5, RORA, and FKBP5 genetic variations, which were used to calculate a polygenic risk score (range=0–8, mean=3.6, SD=1.4).

Results

Most veterans (56.2%) were deployed to Vietnam while significant numbers were deployed to Iraq, Afghanistan, and other post-Vietnam conflicts. Overall, 95.1% of the veterans were male, their mean age was 56.2 (SD=12), and 95.6% were Caucasian. Among the veterans, 24% had high combat exposure. The prevalence of lifetime suicidal thoughts was 11.3%. Additionally, 5.7% ever developed a suicide plan or attempted suicide in their lifetimes. Among those with a history of a lifetime suicide attempt or suicide plan, the PTSD genetic risk score was significantly higher (OR=3.96 vs 3.55, p=0.033), but for suicidal thoughts, this association was not significant (p=0.717). In multivariable analysis (MVA) logistic regression, significant predictors of attempting suicide or having a suicide plan were history of depression (OR=5.04, p<0.001), PTSD genetic risk score (OR=1.25, p=0.036), history of childhood abuse/neglect (OR=2.24, p=0.009), and lifetime marijuana use (OR= 1.56, p=0.020). Conversely, rural residence was protective for suicide risk (OR=0.49; p=0.031). For suicidal thoughts, in the MVA genetic risk score was not significant (p=0.697), but history of child abuse/neglect (p<0.001), history of depression (p>0.001), low psychological resilience (p=0.004), and lifetime marijuana use (p=0.022) were significant.

Discussion

In this study, we identified genetic risk variants and other predictors for suicide among veterans that may have implications for future screening and clinical care. Further research is advised.

Gender as a moderator of the association of military sexual trauma and posttraumatic stress symptoms

OBJECTIVE

The current study examined the moderating role of gender on the association of military sexual trauma (MST) type (harassment-only vs. assault) and posttraumatic stress symptoms (PTSS) using the 6-factor Anhedonia Model.

METHODS

Participants were 1321 service members/veterans. Two-part hurdle models assessed the moderating role of gender on the association of MST type with the presence (at least "moderate" symptoms endorsed within each cluster) or severity of PTSS and symptom clusters.

RESULTS

Among those who experienced assault MST, women were at higher risk for the presence of intrusive, avoidance, negative affect, and anhedonia symptoms, and higher risk for more severe negative affect symptoms. Among those who experienced harassment-only MST, men were at higher risk of more severe PTSS symptoms overall and in the intrusive and dysphoric arousal symptom clusters. No other significant differences were observed.

CONCLUSIONS

Gathering information on MST type may be helpful in treatment planning.

Studying the Health and Performance of Shipboard Sailors: An Evidence Map

INTRODUCTION

It is estimated that sailors who are assigned to surface ships and submarines are deployed for more than 1 year across their careers and they spend 15% to 23% of their time away from home. Research suggests that shipboard sailors experience rates of behavioral health issues similar to those with ground combat experiences. Despite the rigorous operational tempo and the unique shipboard environment experienced by these service members, little military health research has examined the health outcomes of sailors serving aboard ships. The objectives of this study were to develop an evidence map of the peer-reviewed literature to (1) identify potential threats to the health and readiness of shipboard sailors, (2) identify health and performance issues experienced by this population, and (3) identify gaps in the current peer-reviewed published literature on shipboard health and performance.

MATERIALS AND METHODS

A systematic review of the existing peer-reviewed literature pertaining to the health, experiences, and performance of shipboard service members was conducted. Comprehensive search terms were used to identify articles published between January 2000 and April 2018. Identified articles were subject to a two-level review process. Study characteristics for all articles selected for final review were extracted, and articles were categorized into 13 content areas that were selected a priori. Findings are presented in an evidence map.

RESULTS

The initial literature search yielded 8,858 unique articles, 90 of which were eligible for full review. Most articles primarily examined active duty sailors from the U.S. or other foreign militaries (88.9%). A total of 60 articles (67.8%) included information about the type of ship studied; the most frequently examined were submarines (29.5%) and aircraft carriers (27.9%). Most of the included studies used cross-sectional (63.3%) or longitudinal (24.4%) designs. Only 7.8% (n = 7) of articles described interventions. The most commonly examined focal areas included physical health issues, such as viral infections and injuries (56.7%), and health behaviors, such as substance use/misuse (40.0%). Other frequently addressed content areas were occupational stress (38.9%), interpersonal issues (32.2%), ship conditions (30.0%), and mental health (28.9%). Most articles (73.3%) addressed more than one content area. There was a high degree of variation in the measurement tools used; self-report surveys were the most common (48.9%), followed by objective physical, biological, or cognitive measures (32.2%) and medical and personnel record reviews (31.1%).

CONCLUSIONS

The evidence map identified various gaps in the research pertaining to the health and performance of shipboard sailors. These gaps included a lack of research on the risk factors for common health and performance issues experienced by sailors and on the relationship between stressors of shipboard life and sailors' health, performance, and readiness. The results of this evidence map should be used to inform the development, implementation, and evaluation of interventions to improve the shipboard environment and/or the preventive health behaviors used by sailors while underway or deployed.

Factors That Affect Emergency Responder Wellbeing: Considerations for Public Health Responders

PURPOSE

The purpose of this study is to identify key risk factors that could negatively affect public health emergency responders' health and wellbeing. We seek to use this information to provide recommendations and strategies to mitigate such risks.

DESIGN/METHODOLOGY/APPROACH

A narrative review of the peer-reviewed literature on wellbeing of military personnel and other responders was conducted. Data was grouped and categorized according to overarching domains.

FINDINGS

Factors associated with wellbeing were categorized into 5 domains: (1) demographics; (2) mental health concerns; (3) social networks; (4) work environment; and (5) postdeployment life. The strategies identified to promote wellbeing included mental health assessments, preparedness trainings, debriefs in the field, postdeployment debriefs, resources in the field, and further postdeployment decompression strategies.

ORIGINALITY/VALUE

This study provides a unique understanding of the risk factors associated with poor health and wellbeing outcomes in public health emergency response work by extending the body of knowledge that focuses on other types of emergency and military response.

Incidence Rates of Posttraumatic Stress Disorder Over a 17-Year Period in Active Duty Military Service Members

Posttraumatic stress disorder (PTSD) affects approximately 8% of the general population. The prevalence of PTSD is twice as high in active duty service members and military veterans. Few studies have investigated the incidence rates of PTSD in active duty military personnel. The present study evaluated the incidence of PTSD diagnoses and the differences between demographic factors for service members between 2001 and 2017. Data on 182,400 active duty service members between 2001 and 2017 were drawn from the Defense Medical Epidemiological Database and examined by sex, age, service branch, military pay grade, marital status, and race. From 2001 to 2017, the incidence rates of PTSD in the active force (per 1,000 service members) steadily climbed, with a low of 1.24 in 2002 to a high of 12.94 in 2016. Service members most often diagnosed with PTSD were in the U.S. Army, with the enlisted pay grades of E-5-E-9, White, married, male, and between 20 and 24 years old. Statistically significant differences, ps < .001, were found between observed and expected counts across all examined demographic variables. The present study is the first to our knowledge to provide a comprehensive examination of PTSD incidence rates in an active duty military population.

The evolution of mental health outcomes across a combat deployment cycle: A longitudinal study of the Guam Army National Guard

In the United States, National Guard soldiers have been called upon at unprecedented rates since 2001 to supplement active duty military forces. Frequent military deployments generate many occupational and environmental stressors for these citizen-soldiers, from serving in a dangerous zone to being away from family and home for long periods of time. Whereas there is a substantial amount of research focused on deployment-related health outcomes in relation to active duty (i.e., full-time) military populations, reserve forces are less understood. This study focuses on a United States Army National Guard combat unit deployed to Afghanistan. This prospective longitudinal study was conducted over the course an operational deployment cycle (i.e., before, during, and after) to document the evolution of salient mental health outcomes (i.e., post-traumatic stress, depression, general anxiety, and aggression). The findings show that both combat (e.g., killing others) and non-combat (e.g., boredom) stressors negatively affect mental health outcomes, and the severity of these outcomes increases over the course of a deployment cycle. Of special note, the study reveals key gender differences in the evolution of post-traumatic stress (PTS), depression, and anxiety across a deployment cycle: females report increased PTS, depression, and anxiety 6 months post-deployment, whereas the levels reported by males stabilize at their mid-deployment levels. The findings offer insights for medical providers and policymakers in developing more targeted health promotion campaigns and interventions, especially at the post-deployment phase.

Posttraumatic Stress Disorder Symptoms and Criminal Behavior in U.S. Army Populations: The Mediating Role of Psychopathy and Suicidal Ideation

Whereas past research has demonstrated the relationship between posttraumatic stress disorder (PTSD) and criminal behavior, the present study examines the underlying mechanisms driving this association. The primary objective was to determine the role of psychopathy and suicidal ideation as mediating factors in the relationship between military PTSD symptoms and criminal behavior (defined as incarceration status). A correlational study using archival data from the U.S. Disciplinary Barracks (USDB) and a control population of U.S. Army soldiers was conducted. The USDB provided data from 310 incarcerated male U.S. Army soldiers. Data were also collected from 310 nonincarcerated, male U.S. Army soldiers in the greater Fort Rucker, Alabama area. Data validity checks eliminated some cases, thus yielding a final dataset of 246 USDB and 252 control participants. The results suggested partial mediation, in that PTSD symptoms had a direct effect on incarceration status, and significant indirect effects through suicidal ideation and psychopathy while controlling for intelligence and warmth. In furnishing evidence of how psychopathy and suicidal ideation mediate the relationship between PTSD and incarceration status in military personnel, this research highlights specific internalization and externalization mechanisms that may increase the tendencies of people with greater PTSD symptoms to engage in criminal behaviors. By adding to the small amount of prior research on why PTSD sometimes leads people to engage in criminal behaviors, our research provides specific, observable symptoms that clinicians may use to identify, treat, and possibly ameliorate facets of PTSD that can lead affected people to engage in criminal behaviors.

Post-deployment Mental Health in Reserve and National Guard Service Members: Deploying With or Without One's Unit and Deployment Preparedness

Background

Given the greater prevalence of post-deployment mental health concerns among reservists, the higher likelihood of deploying without their regular unit, and potentially lower rates of deployment preparedness, we examined associations between deploying with or without one's regular unit (individual augmentee status, IAS), deployment preparedness, and mental health problems including post-traumatic stress disorder (PTSD), depression (MDD), and binge drinking in a nationally representative sample of Reserve Component (RC) Army and Marine-enlisted males (n = 705).

Methods

A series of multivariate regressions examined the association of mental health with IAS and deployment preparedness, adjusting for demographics. To examine whether deployment preparedness varied by IAS, an IAS × deployment preparedness interaction was included.

Findings

In an adjusted model, being an individual augmentee and low deployment preparedness were associated with any mental health problem (screening positive for PTSD, MDD, binge drinking, or any combination of the three). There was a significant IAS × deployment preparedness interaction. Mental health problems did not vary by preparedness among individual augmentees. Participants deploying with regular units with low-medium preparedness had greater risk for mental health problems (odds ratio [OR] = 3.69, 95% confidence interval [CI] = 1.78-7.62 and OR = 2.29, 95% CI = 1.12-4.71), than those with high preparedness. RC-enlisted male personnel who deployed without their regular unit were five times more likely to have a mental health problem, and were 61% more likely to report binge drinking. Additionally, those with lower levels of deployment preparedness were up to three times more likely to have a mental health problem and up to six times more likely to report PTSD.

Discussion

The current investigation found that both IAS and deployment preparedness were associated with negative mental health outcomes in a large representative sample of previously deployed RC-enlisted male personnel. In particular, low deployment preparedness was associated with an increased likelihood of PTSD, and deploying without one's regular unit was associated with increased rates of binge drinking. There were also significant main and interaction effects of IAS and deployment preparedness on having a mental health problem. It is possible that limiting the number of RC personnel deploying without their regular unit may help to decrease alcohol misuse among U.S. Armed Services reservists during and after future conflicts. Also, to the extent that deployment preparedness is a modifiable risk factor, future studies should examine whether increasing deployment preparedness could mitigate some of the correlates of deployment-related trauma exposure. Finally, future investigation is needed to explain why those who deploy without their regular unit, but who report high deployment preparedness, remain at elevated risk for mental health problems. It is possible that individual augmentees can benefit from a specific preparation for deployment. Those deploying without their regular unit had higher rates of mental health problems regardless of preparedness. These findings have implications for deployment preparedness training for those deploying without their regular unit.

Contribution of traumatic deployment experiences to the burden of mental health problems in Canadian Armed Forces personnel: exploration of population attributable fractions

PURPOSE

Mental health problems are prevalent after combat; they are also common in its absence. Estimates of deployment-attributability vary. This paper quantifies the contribution of different subtypes of occupational trauma to post-deployment mental health problems.

METHODS

Participants were a cohort of 16,193 Canadian personnel undergoing post-deployment mental health screening after return from the mission in Afghanistan. The screening questionnaire assessed post-traumatic stress disorder, depression, panic disorder, generalized anxiety disorder, and exposure to 30 potentially traumatic deployment experiences. Logistic regression estimated adjusted population attributable fractions (PAFs) for deployment-related trauma, which was treated as count variables divided into several subtypes of experiences based on earlier factor analytic work.

RESULTS

The overall PAF for overall deployment-related trauma exposure was 57.5% (95% confidence interval 44.1, 67.7) for the aggregate outcome of any of the four assessed problems. Substantial PAFs were seen even at lower levels of exposure. Among subtypes of trauma, exposure to a dangerous environment (e.g., receiving small arms fire) and to the dead and injured (e.g., handling or uncovering human remains) had the largest PAFs. Active combat (e.g., calling in fire on the enemy) did not have a significant PAF.

CONCLUSIONS

Military deployments involving exposure to a dangerous environment or to the dead or injured will have substantial impacts on mental health in military personnel and others exposed to similar occupational trauma. Potential explanations for divergent findings in the literature on the extent to which deployment-related trauma contributes to the burden of mental disorders are discussed.

Does perceived ostracism contribute to mental health concerns among veterans who have been deployed?

Posttraumatic stress-negative psychological experiences as a result of traumatic stressors-can hinder military veterans' reintegration into society and cause various mental health problems. Veterans need quality social relationships to facilitate reintegration and to cope with posttraumatic stress and related mental health problems; discrimination or other forms of interpersonal rejection can exacerbate these veterans' problems. Ostracism (i.e., being ignored and excluded) is a painful and psychologically distressing experience that may be one factor that contributes to the problems of veterans who are dealing with posttraumatic stress. To our knowledge, this connection has yet to be tested empirically. Thus, we investigated the correlation between posttraumatic stress, perceived ostracism, and other theoretically relevant variables (i.e., mental health problems, perceived social support, psychological need satisfaction) in a sample of veterans who have had at least one deployment. Our results provide preliminary empirical evidence suggesting that perceived ostracism may contribute to veteran' deployment-related psychological problems. Veterans' perceived ostracism correlated with psychological problems (i.e., posttraumatic stress symptoms, anxiety and psychological distress), and it explained additional variance in posttraumatic stress symptoms above and beyond common predictors of these symptoms (i.e., deployment stress, perceived military and civilian-based social support). Finally, perceived ostracism emerged as the most important predictor of posttraumatic stress symptoms in a relative weights analysis.

Mental Health Impact of Homecoming Experience Among 1730 Formerly Deployed Veterans From the Vietnam War to Current Conflicts: Results From the Veterans' Health Study

We examined the effects of homecoming support on current mental health among 1730 deployed veterans from Vietnam, Iraq/Afghanistan, Persian Gulf, and other conflicts. The prevalence of current posttraumatic stress disorder (PTSD) was 5.4%, current depression was 8.3%, and 5.4% had suicidal thoughts in the past month. Overall, 26% of veterans had low homecoming support, which was more prevalent among Vietnam veterans (44.3%, p < 0.001). In multivariable logistic regressions, controlling for demographics, combat exposure, number of deployments, trauma history, and operational theater, low postdeployment support was associated with PTSD (odds ratio, 2.13; p = 0.032) and suicidality (odds ratio, 1.91; p < 0.030), but not depression. For suicidality, an interaction was detected for homecoming by theater status, whereby Iraq/Afghanistan veterans with lower homecoming support had a higher probability of suicidal thoughts (p = 0.002). Thus, years after deployment, lower homecoming support was associated with current PTSD and suicidality, regardless of theater and warzone exposures. For suicidality, lower support had a greater impact on Iraq/Afghanistan veterans.

Predictors of Posttraumatic Stress Disorder, Anxiety Disorders, Depressive Disorders, and Any Mental Health Condition Among U.S. Soldiers and Marines, 2001-2011

Understanding mental health disorder diagnosis and treatment seeking among active-duty military personnel is a topic with both clinical and policy implications. It has been well documented in military populations that individual-level military experience, including deployment history and combat exposure, influences mental health outcomes, but the impact of unit-level factors is less well understood. In the current study, we used administrative longitudinal data to examine a comprehensive set of unit- and individual-level predictors of posttraumatic stress disorder (PTSD), non-PTSD anxiety disorders, depressive disorders, and overall mental health diagnoses among Army and Marines Corps personnel. Using Cox survival models for time-dependent variables, we analyzed time from military accession (between January 1, 2001 and December 31, 2011) until first mental health diagnosis for 773,359 soldiers and 332,093 Marines. Prior diagnosis of a substance abuse disorder during one's military career, hazard ratios (HRs) = 1.68-3.10, and cumulative time spent deployed, HRs = 1.11-2.04, were the most predictive risk factors for all outcomes. Male sex, HRs = 0.35-0.57, and officer rank, HRs = 0.13-0.23, were the most protective factors. Unit-level rate of high deployment stress was a small but significant predictor of all outcomes after controlling for individual-level deployment history and other predictors, HRs = 1.01-1.05. Findings suggest both unit- and individual-level risk and protective factors of mental health diagnoses associated with treatment seeking. Clinical, including mental health assessment and management, and policy implications related to the military environment and the individual as it relates to mental health disorders are discussed.

Deployment of personnel to military operations: impact on mental health and social functioning

This Campbell systematic review examines the effects of deployment on mental health. The review summarizes evidence from 185 studies. All studies used observational data to quantify the effect of deployment. This review includes studies that evaluate the effects of deployment on mental health. A total of 185 studies were identified. However, only 40 of these were assessed to be of sufficient methodological quality to be included in the final analysis. The studies spanned the period from 1993 to 2017 and were mostly carried out in the USA, UK and Australia. The studies all had some important methodological weaknesses. None of the included studies used experimental designs (random assignment). Deployment to military operations negatively affects the mental health functioning of deployed military personnel. For assessments taken more than 24 months since exposure, we consistently found adverse effects of deployment on all mental health domains (PTSD, depression, substance abuse/dependence, and common mental disorders), particularly on PTSD. For assessments taken less than 24 months (or a variable number of months since exposure) the evidence was less consistent and in many instances inconclusive.

Plain language summary

Deployment to military operations negatively affects the mental health functioning of deployed military personnel: While additional research is needed, the current evidence strongly supports the notion that deployment negatively affects mental health functioning of deployed military personnel.What is this review about?: When military personnel are deployed to military operations abroad they face an increased risk of physical harm, and an increased risk of adverse shocks to their mental health.The primary condition under consideration is deployment to an international military operation. Deployment to a military operation is not a uniform condition; rather, it covers a range of scenarios. Military deployment is defined as performing military service in an operation at a location outside the home country for a limited time period, pursuant to orders.The review included studies that reported outcomes for individuals who had been deployed. This review looked at the effect of deployment on mental health outcomes. The mental health outcomes are: post-traumatic stress disorder (PTSD), major depressive disorder (MDD), common mental disorders (depression, anxiety and somatisation disorders) and substance-related disorders.By identifying the major effects of deployment on mental health and quantifying these effects, the review can inform policy development on deployment and military activity as well as post-deployment support for veterans. In this way the review enables decision-makers to prioritise key areas.What are the main findings of this review?: What studies are included?: This review includes studies that evaluate the effects of deployment on mental health. A total of 185 studies were identified. However, only 40 of these were assessed to be of sufficient methodological quality to be included in the final analysis. The studies spanned the period from 1993 to 2017 and were mostly carried out in the USA, UK and Australia. The studies all had some important methodological weaknesses. None of the included studies used experimental designs (random assignment).Does deployment have an effect on mental health?: Deployment to military operations negatively affects the mental health functioning of deployed military personnel. For assessments taken more than 24 months since exposure, we consistently found adverse effects of deployment on all mental health domains (PTSD, depression, substance abuse/dependence, and common mental disorders), particularly on PTSD. For assessments taken less than 24 months (or a variable number of months since exposure) the evidence was less consistent and in many instances inconclusive.What do the findings of this review mean?: The odds of screening positive for PTSD and depression were consistently high in the longer term. This suggests that efforts should be increased to detect and treat mental disorders, as effects may be long-lasting.Overall the risk of bias in the majority of included studies was high. While it is difficult to imagine a randomised study design to understand how deployment affects mental health, other matters such as changes to personnel policy, or unanticipated shocks to the demand for military personnel, could potentially be a rich source of quasi-experimental variation.How up-to-date is this review?: The review authors searched for studies up to 2017. This Campbell systematic review was published in March 2018.

Executive summary

BACKGROUND: When military personnel are deployed to military operations abroad they face an increased risk of physical harm, and an increased risk of adverse shocks to their mental health. Research suggests that the increased risk to mental health is mainly due to the hazards of war, combat exposure: firing weapons, road side bombs, seeing fellow soldiers, friends, civilians, and enemies being injured, maimed or killed. These experiences may lead to severe mental stress. The adverse impact on mental health is the psychological cost of war, and it is of interest to policymakers to learn the magnitude of these effects. This review sets out to synthesise available evidence about the consequences of deployment for deployed military personnel in the mental health and social functioning domains.OBJECTIVES: The objective of this review isto synthesise the consequences of deployment to military operation on the mental health and social functioning of deployed military personnel.SEARCH METHODS: We searched electronic databases, grey literature, and references from primary studies and related reviews. No language or date restrictions were applied to the searches. We searched the following electronic databases: Academic Search Elite, Cochrane Library, EMBASE, ERIC, MEDLINE, PsycINFO, Science Citation Index, Social Science Citation Index, SocINDEX, as well as the Nordic platforms: bibliotek.dk, BIBSYS, and LIBRIS. The conclusions of this review are based on the most recent searches performed. The last search was performed in April 2017.SELECTION CRITERIA: Primary studies had to meet the following inclusion criteria: Participants: The participants should be military personnel.Intervention: The condition should be deployment to a military operation.Comparison: The relevant comparisons were either comparing a) deployed military personnel to non-deployed military personnel, b) deployed military personnel to military personnel deployed elsewhere, for example personnel deployed to non-combat operations, c) military personnel deployed to the same operation but stratified by combat exposure.Outcomes: The study should report on one or more mental health outcomes, and/or social functioning for the deployed participants. In particular studies should report on one or more of the following mental health outcomes: PTSD, major depression, substance abuse or dependence (including alcohol), and common mental disorders (depression and anxiety disorders). The following social functioning outcomes were relevant: employment, and homelessness.Study Designs: Both experimental and quasi-experimental designs with a comparison group were eligible for inclusion in the review. Studies were excluded if they: Reported on deployments taking place before 1989.Used a within group pre-post study design.Did not report on at least one of the mental health or social functioning outcomes. DATA COLLECTION AND ANALYSIS: The total number of potentially relevant studies constituted31,049records. A total of 185 studies met the inclusion criteria and were critically appraised by the review authors. The final selection of 185 studies was from 13 different countries.Forty eight of the 185 studies did not report effect estimates or provide data that would allow the calculation of an effect size and standard error. Fifty four studies were excluded because of overlapping samples. The majority of those studies were from USA but the main reason for not using studies from USA in the synthesis was lack of information to calculate an effect size. Nearly half the studies from the UK could not be used in the synthesis due to overlap of data samples. Forty three studies were judged to have a very high risk of bias (5 on the scale) and, in accordance with the protocol, we excluded these from the data synthesis on the basis that they would be more likely to mislead than inform., Thus a total of 40 studies, from five different countries, were included in the data synthesis.Random effects models were used to pool data across the studies. We used the odds ratio. Pooled estimates were weighted with inverse variance methods, and 95% confidence intervals were calculated. The meta-analyses were carried out by time since exposure (short, medium, long, and other time since exposure) and by type of comparison (deployed versus non-deployed, all deployed but stratified by either combat operations versus non-combat operations, or stratified by combat exposure). We performed single factor subgroup analysis. The assessment of any difference between subgroups was based on 95% confidence intervals. Funnel plots were used to assess the possibility of publication bias. Sensitivity analysis was used to evaluate whether the pooled effect sizes were robust across components of methodological quality.MAIN RESULTS: The findings were mixed, depending on the outcome, the time since exposure and the approach (deployed versus non-deployed termed absolute or stratified by extent of combat termed relative) used to investigate the effect. It was not possible to analyse the outcomes homelessness and employment. All studies that could be used in the data synthesis reported on the impact of deployment on mental health; PTSD, depression, substance use or common mental disorder.For assessments taken less than 24 months since exposure the evidence was inconclusive either because too few studies reported results in the short and medium term and/or the degree of heterogeneity between studies was large.For assessments taken at other time points (a variable number of months since exposure) the evidence was inconclusive for the relative comparisons due to either too few studies or a substantial degree of heterogeneity between studies. For the absolute comparison the analysis of common mental disorder was inconclusive, whereas the average effects of PTSD and depression were positive and statistically significant (PTSD odds ratio (OR) was 1.91 (95% confidence interval (CI): 1.28 to 2.85) and OR=1.98 (95% CI: 1.05 to 3.70) for depression). The analysis concerning substance use indicated that deployed participants did not have higher odds of screening positive for substance use compared to non-deployed participants (OR=1.15 (95% CI: 0.98 to 1.36)).For assessments taken more than 24 months post exposure, meta-analyses indicated that the odds of screening positive for PTSD, depression, substance use and common mental disorder were higher for participants in the deployed group compared to participants in the group that were not deployed (PTSD OR=3.31 (95% CI: 2.69 to 4.07), OR=2.19 (95% CI: 1.58 to 3.03) for depression, OR=1.27 (95% CI: 1.15 to 1.39) for substance use, and OR=1.64 (95% CI: 1.38 to 1.96) for common mental disorder). Likewise, participants reporting high combat exposure had higher odds of screening positive for PTSD and depression than participants reporting lower exposure for long term assessments (PTSD OR=3.05 (95% CI: 1.94 to 4.80) and OR=1.81 (95% CI: 1.28 to 2.56) for depression). The analyses of substance use and common mental disorder were inconclusive due to too few studies.On the basis of the prevalence of mental health problems in pre-deployed or non-deployed population based comparison sampleswe would therefore expect the long term prevalence of PTSD in post-deployed samples to be in the range 6.1 - 14.9%, the long term prevalence of depression to be in the range from 7.6% to 18%, the long term prevalence of substance use to be in the range from 2.4% to 17.5% and the prevalence of common mental disorder to be in the range from 10% to 23%.Sensitivity analyses resulted in no appreciable change in effect size, suggesting that the results are robust.It was only possible to assess the impact of two types of personnel characteristics (branch of service and duty/enlistment status) on the mental health outcomes. We found no evidence to suggest that the effect of deployment on any outcomes differ between these two types of personnel characteristics.AUTHORS' CONCLUSIONS: Deployment to military operations negatively affects the mental health functioning of deployed military personnel. We focused on the effect of deployment on PTSD (post-traumatic stress disorder), depression, substance abuse/dependence, and common mental disorders (depression and anxiety disorders). For assessments taken less than 24 months (or a variable number of months since exposure) the evidence was less consistent and in many instances inconclusive. For assessments taken more than 24 months since exposure, we consistently found adverse effects of deployment on all domains, particularly on PTSD. There is increased political awareness of the need to address post deployment mental health problems. The odds of screening positive for PTSD and depression were consistently high in the longer term. This suggests that efforts should be increased to detect and treat mental disorders, as effects may be long lasting. Mental illness is of particular concern in the military for operational reasons, but they may be hard to detect in the military setting because a military career is intimately linked with mental and physical strength.It was not possible to examine a number of factors which we had reason to expect would impact on the magnitude of the effect. This would have been particularly relevant from a policy perspective because these are direct parameters that one could use to optimally "organize" deployment in order to minimize impacts on mental health functioning.While additional research is needed, the current evidence strongly supports the notion that deployment negatively affects mental health functioning of deployed military personnel. The next step is to begin to examine preventive measures and policies for organizing deployment, in order to minimize the effects on mental health.

Resilience Mediates Impact of Some Childhood Maltreatment on Post-Traumatic Stress Symptoms in Conscripted Marines in the Republic of Korea

Although it is known that post-traumatic stress symptoms (PTSS) can result from military service, the variance in PTSS unexplained by military service warrants further investigation, and no researchers have investigated South Korean Marines' vulnerability during their 2-year conscripted service as the first line of national defense against threats from North Korea. This study was designed to examine whether resilience mediated the relationship between childhood maltreatment and PTSS in 169 Korean conscripts into the Marine Corps. In a cross-sectional study design, the Childhood Trauma Questionnaire-Short Form was used to measure childhood maltreatment, including abuse and neglect. The Impact of Event Scale-Revised and the Connor-Davidson Resilience Scale were used to measure PTSS and resilience. Structural equation modeling was used for data analysis. Half the conscripts reported at least one type of childhood maltreatment, and 22.3% had high PTSS, even in a short period of service. Childhood abuse was significantly associated with PTSS during military service, a relationship that was not mediated by resilience. However, resilience mediated the relationship between childhood neglect and PTSS during military service. Assessment of childhood maltreatment and resilience prior to military service is crucial for identifying conscripts at increased risk for PTSS during even brief military service. In addition to direct interventions for abuse effects among all Marines, interventions enhancing resilience may benefit conscripts who experienced childhood neglect. © 2016 Wiley Periodicals, Inc.

Beyond symptom self-report: use of a computer "avatar" to assess post-traumatic stress disorder (PTSD) symptoms

Post-traumatic stress disorder (PTSD) can occur in the wake of exposure to a traumatic event. Currently, PTSD symptoms are assessed mainly through self-report in the form of questionnaire or clinical interview. Self-report has inherent limitations, particularly in psychiatric populations who may have limited awareness of deficit, reduced attention span, or poor vocabulary and/or literacy skills. Diagnosis and evaluation of treatment efficacy would be aided by behavioral measures. A viable alternative may be virtual environments, in which the participant guides an on-screen "avatar" through a series of onscreen events meant to simulate real-world situations. Here, a sample of 82 veterans, self-assessed for PTSD symptoms was administered such a task, in which the avatar was confronted with situations that might evoke avoidant behavior, a core feature of PTSD. Results showed a strong correlation between PTSD symptom burden and task performance; in fact, the ability to predict PTSD symptom burden based on simple demographic variables (age, sex, combat exposure) was significantly improved by adding task score as a predictor variable. The results therefore suggest that virtual environments may provide a new way to assess PTSD symptoms, while avoiding at least some of the limitations associated with symptom self-report, and thus might be a useful complement to questionnaire or clinical interview, potentially facilitating both diagnosis and evaluation of treatment efficacy.

Time-course of PTSD symptoms in the Australian Defence Force: a retrospective cohort study

AIMS

Understanding the time-course of post-traumatic stress disorder (PTSD), and the underlying events, may help to identify those most at risk, and anticipate the number of individuals likely to be diagnosed after exposure to traumatic events.

METHOD

Data from two health surveys were combined to create a cohort of 1119 Australian military personnel who deployed to the Middle East between 2000 and 2009. Changes in PTSD Checklist Civilian Version (PCL-C) scores and the reporting of stressful events between the two self-reported surveys were assessed. Logistic regression was used to examine the association between the number of stressful events reported and PTSD symptoms, and assess whether those who reported new stressful events between the two surveys, were also more likely to report older events. We also assessed, using linear regression, whether higher scores on the Kessler Psychological Distress Scale or the Alcohol Use Disorder Identification Test were associated with subsequent increases in the PCL-C in those who had experienced a stressful event, but who initially had few PTSD symptoms.

RESULTS

Overall, the mean PCL-C scores in the two surveys were similar, and 78% of responders stayed in the same PCL-C category. Only a small percentage moved from having few symptoms of PTSD (PCL-C < 30) in Survey 1 to meeting the criteria for PTSD (PCL-C ≥ 50) at Survey 2 (1% of all responders, 16% of those with PCL-C ≥ 50 at Survey 2). Personnel who reported more stressful lifetime events were more likely to score higher on the PCL-C. Only 51% reported the same stressful event on both surveys. People who reported events occurring between the two surveys were more likely to record events from before the first survey which they had not previously mentioned (OR 1.48, 95% CI (1.17, 1.88), p < 0.001), than those who did not. In people who initially had few PTSD symptoms, a higher level of psychological distress, was significantly associated with higher PCL-C scores a few years later.

CONCLUSIONS

The reporting of stressful events varied over time indicating that while the impact of some stressors endure, others may increase or decline in importance. When screening for PTSD, it is important to consider both traumatic experiences on deployment and other stressful life events, as well as other mental health problems among military personnel, even if individuals do not exhibit symptoms of PTSD on an initial assessment.

The Impact of Infidelity on Combat-Exposed Service Members

This study examined relationships between combat-exposed Operation Enduring Freedom/Operation Iraqi Freedom veterans' experiences related to infidelity during deployment (i.e., indicating that a partner was unfaithful or reporting concern about potential infidelity) and postdeployment mental health, as well as the role of subsequent stress exposure and social support in these associations. The sample consisted of 571 individuals (338 men). There were 128 participants (22.2%) who indicated that their partners were unfaithful during their most recent deployment. Of the remaining 443 participants, 168 (37.8%) indicated that they were concerned that their partners might have been unfaithful. Individuals who indicated that their partners were unfaithful exhibited higher levels of posttraumatic stress symptomatology (β = .08; f(2) = .18) and depression symptom severity (β = .09; f(2) = .14), compared to individuals who did not indicate that their partners were unfaithful. For both men and women, reported infidelity was associated with mental health indirectly via postdeployment life stressors, whereas infidelity concerns were indirectly associated with mental health via postdeployment life stressors for men only. Findings suggested that infidelity can have a significant impact on combat-exposed veterans' mental health and highlight the need for additional research on this understudied topic within the military population.

Mental Health Disorders and Treatment Seeking Among Veterans in Non-VA Facilities: Results and Implications from the Veterans' Health Study

We surveyed 700 veterans who were outpatients in a non-Veterans Affairs (VA) multihospital system. Our objective was to assess the prevalence of mental disorders and service use among these veterans. The majority were Vietnam veterans (72.0%), and male (95.9%), and 40.4% reported recently using the VA for care. The prevalence of lifetime post-traumatic stress disorder (PTSD) was 9.6%, lifetime depression 18.4%, and lifetime mental health service use 50.1%. In multivariate analyses, significant factors associated with PTSD, depression, and mental health service use were low self-esteem, use of alcohol/drugs to cope, history of childhood adversity, high combat exposure, and low psychological resilience. VA service use was associated with greater mental health service use and combat exposure. With the exception of alcohol misuse, the mental health status of veterans seen in non-VA facilities appeared to be better than reported in past studies. Because most veterans have access to both VA and non-VA services, these findings have implications for veterans and outcomes research.

Prevalence of, risk factors for, and consequences of posttraumatic stress disorder and other mental health problems in military populations deployed to Iraq and Afghanistan

This review summarizes the epidemiology of posttraumatic stress disorder (PTSD) and related mental health problems among persons who served in the armed forces during the Iraq and Afghanistan conflicts, as reflected in the literature published between 2009 and 2014. One-hundred and sixteen research studies are reviewed, most of which are among non-treatment-seeking US service members or treatment-seeking US veterans. Evidence is provided for demographic, military, and deployment-related risk factors for PTSD, though most derive from cross-sectional studies and few control for combat exposure, which is a primary risk factor for mental health problems in this cohort. Evidence is also provided linking PTSD with outcomes in the following domains: physical health, suicide, housing and homelessness, employment and economic well-being, social well-being, and aggression, violence, and criminality. Also included is evidence about the prevalence of mental health service use in this cohort. In many instances, the current suite of studies replicates findings observed in civilian samples, but new findings emerge of relevance to both military and civilian populations, such as the link between PTSD and suicide. Future research should make effort to control for combat exposure and use longitudinal study designs; promising areas for investigation are in non-treatment-seeking samples of US veterans and the role of social support in preventing or mitigating mental health problems in this group.

A meta-analysis of risk factors for combat-related PTSD among military personnel and veterans

Post-traumatic stress disorder (PTSD), a complex and chronic disorder caused by exposure to a traumatic event, is a common psychological result of current military operations. It causes substantial distress and interferes with personal and social functioning. Consequently, identifying the risk factors that make military personnel and veterans more likely to experience PTSD is of academic, clinical, and social importance. Four electronic databases (PubMed, Embase, Web of Science, and PsycINFO) were used to search for observational studies (cross-sectional, retrospective, and cohort studies) about PTSD after deployment to combat areas. The literature search, study selection, and data extraction were conducted by two of the authors independently. Thirty-two articles were included in this study. Summary estimates were obtained using random-effects models. Subgroup analyses, sensitivity analyses, and publication bias tests were performed. The prevalence of combat-related PTSD ranged from 1.09% to 34.84%. A total of 18 significant predictors of PTSD among military personnel and veterans were found. Risk factors stemming from before the trauma include female gender, ethnic minority status, low education, non-officer ranks, army service, combat specialization, high numbers of deployments, longer cumulative length of deployments, more adverse life events, prior trauma exposure, and prior psychological problems. Various aspects of the trauma period also constituted risk factors. These include increased combat exposure, discharging a weapon, witnessing someone being wounded or killed, severe trauma, and deployment-related stressors. Lastly, lack of post-deployment support during the post-trauma period also increased the risk of PTSD. The current analysis provides evidence of risk factors for combat-related PTSD in military personnel and veterans. More research is needed to determine how these variables interact and how to best protect against susceptibility to PTSD.

The critical warzone experiences (CWE) scale: initial psychometric properties and association with PTSD, anxiety, and depression

The objective of the present research was to develop and evaluate a critical warzone experiences (CWE) scale for use with Iraq/Afghanistan veterans. The psychometric properties of the CWE were evaluated across three independent samples of Iraq/Afghanistan veterans. Despite its brevity (7 items), the CWE exhibited good internal consistency (average α =0.83), good temporal stability (1-year test-retest reliability=0.73), good concurrent validity with lengthier measures of warzone experiences (average r=0.74), and a clear unidimensional factor structure (average factor loading=0.69). Study 2 confirmed the CWE׳s factor structure through confirmatory factor analysis, and structural equation modeling demonstrated a strong association between CWE and post-deployment mental health, β =0.49, p<0.001. Study 3 provided further support for the predictive validity of the CWE by demonstrating that it was associated with PTSD diagnosis, clinician-rated PTSD symptom severity, and global functional impairment in an independent sample of Iraq/Afghanistan veterans (average r=0.59). While replication of these findings in more diverse samples is needed, the preliminary evidence from these studies indicates that the CWE is a brief, reliable, and valid measure of critical warzone experiences among Iraq/Afghanistan war veterans.

Posttraumatic stress disorder post Iraq and Afghanistan: prevalence among military subgroups

A large body of research has been produced in recent years investigating posttraumatic stress disorder (PTSD) among military personnel following deployment to Iraq and Afghanistan, resulting in apparent differences in PTSD prevalence. We compare prevalence estimates for current PTSD between military subgroups, providing insight into how groups may be differentially affected by deployment. Systematic literature searches using the terms PTSD, stress disorder, and acute stress, combined with terms relating to military personnel, identified 49 relevant papers. Studies with a sample size of less than 100 and studies based on data for treatment seeking or injured populations were excluded. Studies were categorized according to theatre of deployment (Iraq or Afghanistan), combat and noncombat deployed samples, sex, enlistment type (regular or reserve and [or] National Guard), and service branch (for example, army, navy, and air force). Meta-analysis was used to assess PTSD prevalence across subgroups. There was large variability in PTSD prevalence between studies, but, regardless of heterogeneity, prevalence rates of PTSD were higher among studies of Iraq-deployed personnel (12.9%; 95% CI 11.3% to 14.4%), compared with personnel deployed to Afghanistan (7.1%; 95% CI 4.6% to 9.6%), combat deployed personnel, and personnel serving in the Canadian, US, or UK army or the navy or marines (12.4%; 95% CI 10.9% to 13.4%), compared with the other services (4.9%; 95% CI 1.4% to 8.4%). Contrary to findings from within-study comparisons, we did not find a difference in PTSD prevalence for regular active-duty and reserve or National Guard personnel. Categorizing studies according to deployment location and branch of service identified differences among subgroups that provide further support for factors underlying the development of PTSD.

Risk factors for post-deployment posttraumatic stress disorder in national guard/reserve service members

Identification of factors that increase risk for PTSD in military personnel following deployments is critical to early intervention and prevention. The study tested hypothesized main and moderating risk factors for PTSD in National Guard/Reserve members deployed to Iraq or Afghanistan. Members of the National Guard/Reserves (n=238) completed diagnostic interviews and measures of risk factors at a post-deployment assessment conducted an average of four and a half months following return from deployment. Hierarchical multivariate logistic regression analyses were used to test hypotheses. Higher levels of combat exposure, life and family concerns during deployment, and post-deployment social support independently predicted PTSD. Life/family concerns during deployment and perceived adequacy of training and preparation were significant moderators of the association between combat exposure and PTSD. Among those with higher levels of both combat exposure and life and family stress, 27% had PTSD in contrast to 3% of those with high exposure but lower levels of such stress during deployment. In addition to combat exposure, life and family stress during deployment is a particularly important predictor of PTSD. The findings highlight the importance of identifying and addressing such stress.

Learning to obtain reward, but not avoid punishment, is affected by presence of PTSD symptoms in male veterans: empirical data and computational model

Post-traumatic stress disorder (PTSD) symptoms include behavioral avoidance which is acquired and tends to increase with time. This avoidance may represent a general learning bias; indeed, individuals with PTSD are often faster than controls on acquiring conditioned responses based on physiologically-aversive feedback. However, it is not clear whether this learning bias extends to cognitive feedback, or to learning from both reward and punishment. Here, male veterans with self-reported current, severe PTSD symptoms (PTSS group) or with few or no PTSD symptoms (control group) completed a probabilistic classification task that included both reward-based and punishment-based trials, where feedback could take the form of reward, punishment, or an ambiguous “no-feedback” outcome that could signal either successful avoidance of punishment or failure to obtain reward. The PTSS group outperformed the control group in total points obtained; the PTSS group specifically performed better than the control group on reward-based trials, with no difference on punishment-based trials. To better understand possible mechanisms underlying observed performance, we used a reinforcement learning model of the task, and applied maximum likelihood estimation techniques to derive estimated parameters describing individual participants’ behavior. Estimations of the reinforcement value of the no-feedback outcome were significantly greater in the control group than the PTSS group, suggesting that the control group was more likely to value this outcome as positively reinforcing (i.e., signaling successful avoidance of punishment). This is consistent with the control group’s generally poorer performance on reward trials, where reward feedback was to be obtained in preference to the no-feedback outcome. Differences in the interpretation of ambiguous feedback may contribute to the facilitated reinforcement learning often observed in PTSD patients, and may in turn provide new insight into how pathological behaviors are acquired and maintained in PTSD.

Deployment and PTSD in the female combat veteran: a systematic review

BACKGROUND

The number of females serving in the Gulf War has risen and continues to be a rapidly growing group. Females occupy a wide range of roles and face a myriad of challenges as they serve alongside their male counterparts in almost every role. Females are also facing redeployment, multiple deployments, and/or extended deployments. The stressors of war and deployments may be putting them at risk for posttraumatic stress disorder (PTSD). If left untreated, PTSD can have devastating and debilitating consequences for veteran's functioning and relationships, their families, and society.

OBJECTIVE

To examine the literature over the past 10 years to determine if there is a relationship between deployments and the incidence of PTSD in female combat veterans as compared with male veterans.

METHOD

Systematic review.

RESULTS

The numbers of veterans screening for PTSD are increasing. Those who have experienced extended or multiple tours have higher screening rates. Females report slightly less combat exposure than males but higher exposures to other stressors of war such as military sexual trauma. Females were at higher risk for depression while males were at higher risk of substance abuse. Females and lower rank were associated with greater utilization of Veterans Administration services.

Trends in binge and heavy drinking, alcohol-related problems, and combat exposure in the U.S. military

Population-based Department of Defense health behavior surveys were examined for binge and heavy drinking among U.S. active duty personnel. From 1998-2008, personnel showed significant increases in heavy drinking (15% to 20%) and binge drinking (35% to 47%). The rate of alcohol-related serious consequences was 4% for nonbinge drinkers, 9% for binge drinkers, and 19% for heavy drinkers. Personnel with high combat exposure had significantly higher rates of heavy (26.8%) and binge (54.8%) drinking than their counterparts (17% and 45%, respectively). Heavy and binge drinking put service members at high risk for problems that diminish force readiness and psychological fitness.

Predictors of psychiatric disorders in combat veterans

BACKGROUND

Most previous research that has examined mental health among Operation Enduring Freedom and Operation Iraqi Freedom (OEF/OIF) combatants has relied on self-report measures to assess mental health outcomes; few studies have examined predictors of actual mental health diagnoses. The objective of this longitudinal investigation was to identify predictors of psychiatric disorders among Marines who deployed to combat in Iraq and Afghanistan.

METHODS

The study sample consisted of 1113 Marines who had deployed to Iraq or Afghanistan. Demographic and psychosocial predictor variables from a survey that all Marines in the sample had completed were studied in relation to subsequent psychiatric diagnoses. Univariate and multivariate logistic regression were used to determine the influence of the predictors on the occurrence of psychiatric disorders.

RESULTS

In a sample of Marines with no previous psychiatric disorder diagnoses, 18% were diagnosed with a new-onset psychiatric disorder. Adjusting for other variables, the strongest predictors of overall psychiatric disorders were female gender, mild traumatic brain injury symptoms, and satisfaction with leadership. Service members who expressed greater satisfaction with leadership were about half as likely to develop a mental disorder as those who were not satisfied. Unique predictors of specific types of mental disorders were also identified.

CONCLUSIONS

Overall, the study's most relevant result was that two potentially modifiable factors, low satisfaction with leadership and low organizational commitment, predicted mental disorder diagnoses in a military sample. Additional research should aim to clarify the nature and impact of these factors on combatant mental health.

Anxiety and depression in Marines sent to war in Iraq and Afghanistan

Although the effects of combat deployment on posttraumatic stress disorder have been extensively studied, little is known about the effects of combat deployment on depression and anxiety. This study examined the factors associated with anxiety and depression in a sample of 1560 US Marines who were deployed to Iraq and Afghanistan. Eleven demographic and psychosocial factors were studied in relation to depression and anxiety. Five factors emerged as significant in relation to depression: deployment-related stressors, combat exposure, attitudes toward leadership, mild traumatic brain injury symptoms, and marital status. The same factors, with the exception of marital status, emerged as significant in relation to anxiety. Deployment-related stressors had a stronger association with both depression and anxiety than any other variable, including combat exposure. This finding is important because deployment-related stressors are potentially modifiable by the military.

Traumatic events, other operational stressors and physical and mental health reported by Australian Defence Force personnel following peacekeeping and war-like deployments

BACKGROUND

The association between stressful events on warlike deployments and subsequent mental health problems has been established. Less is known about the effects of stressful events on peacekeeping deployments.

METHODS

Two cross sectional studies of the Australian Defence Force were used to contrast the prevalence of exposures reported by a group deployed on a peacekeeping operation (Bougainville, n = 1704) and those reported by a group deployed on operations which included warlike and non-warlike exposures (East Timor, n = 1333). A principal components analysis was used to identify groupings of non-traumatic exposures on deployment. Multiple regression models were used to assess the association between self-reported objective and subjective exposures, stressors on deployment and subsequent physical and mental health outcomes.

RESULTS

The principal components analysis produced four groups of non-traumatic stressors which were consistent between the peacekeeping and more warlike deployments. These were labelled 'separation', 'different culture', 'other people' and 'work frustration'. Higher levels of traumatic and non-traumatic exposures were reported by veterans of East Timor compared to Bougainville. Higher levels of subjective traumatic exposures were associated with increased rates of PTSD in East Timor veterans and more physical and psychological health symptoms in both deployed groups. In Bougainville and East Timor veterans some non-traumatic deployment stressors were also associated with worse health outcomes.

CONCLUSION

Strategies to best prepare, identify and treat those exposed to traumatic events and other stressors on deployment should be considered for Defence personnel deployed on both warlike and peacekeeping operations.

Behavioral inhibition and PTSD symptoms in veterans

Behavioral inhibition (BI), a temperamental bias to respond to novel stimuli with avoidance behaviors, is a risk factor for posttraumatic stress disorder (PTSD). It is unclear whether BI accounts for additional variance in PTSD symptom severity beyond that accounted for by general anxiety. Here, 109 veterans (mean age 50.4 years, 9.2% female) provided self-assessment of PTSD symptoms, state and trait anxiety, combat exposure, and current (adult) and retrospective (childhood) BI. Adult BI was correlated with anxiety and PTSD symptom severity, especially cluster C (avoidance) symptoms, but not with combat exposure. A regression model including adult BI, state and trait anxiety, and combat exposure was able to correctly classify over 80% of participants according to presence or absence of severe PTSD symptoms. Because avoidance behaviors are a core component of PTSD, self-assessments of BI may be an important tool in understanding PTSD and potentially assessing vulnerability to the disorder.

Synthesis of the psychometric properties of the PTSD checklist (PCL) military, civilian, and specific versions

The posttraumatic stress disorder checklist is a commonly used measure, with military (PCL-M), civilian (PCL-C), and specific trauma (PCL-S) versions. This synthesis of the psychometric properties of all three versions found the PCL to be a well-validated measure. The PCL shows good temporal stability, internal consistency, test-retest reliability, and convergent validity. The majority of structural validity studies support four factor models. Little is available on discriminant validity and sensitivity to change. Strengths, limitations, and future research directions are discussed. Understanding the PCL's psychometric properties, strengths (e.g., items map on to DSM-IV diagnostic criteria), and limitations (e.g., may overestimate PTSD prevalence) will help clinicians and researchers make educated decisions regarding the appropriate use of this measure in their particular setting.

Prolonged exposure therapy for combat-related posttraumatic stress disorder: an examination of treatment effectiveness for veterans of the wars in Afghanistan and Iraq

The Veteran's Health Administration (VHA) has launched a large-scale initiative to promote prolonged exposure (PE) therapy, an evidence-based treatment for PTSD. While existing randomized controlled trials (RCTs) unambiguously support the efficacy of PE in civilian and some military populations, there is a need to better understand the course of treatment for combat Veterans of the current wars receiving PE in normative mental healthcare settings. The current study investigates 65 Veterans receiving care at an urban VA medical center. All Veterans were diagnosed with PTSD via a structured interview and treated with PE. Measures of PTSD and depression were collected pre- and post-treatment and every two sessions during treatment. Dependent means t-tests were used to estimate pre- and post-treatment d-type effect sizes. Additionally, hierarchical linear models (HLM) were used to investigate treatment effects over time, relationships between patient characteristics and outcomes, and to provide estimates of R(2)-type effect sizes. Results indicate that PE in regular VA mental healthcare contexts can be as effective as when implemented in carefully conducted RCTs.

Consensus recommendations for common data elements for operational stress research and surveillance: report of a federal interagency working group

Empirical studies and surveillance projects increasingly assess and address potentially adverse psychological health outcomes from the stress of military operations, but no standards yet exist for common concept definitions, variable categories, and measures. This article reports the consensus recommendations of the federal interagency Operational Stress Working Group for common data elements to be used in future operational stress research and surveillance with the goal of improving comparability across studies. Operational stress encompasses more than just combat; it occurs everywhere service members and their families live and work. Posttraumatic stress is not the only adverse mental or behavioral health outcome of importance. The Operational Stress Working Group contends that a primary goal of operational stress research and surveillance is to promote prevention of adverse mental and behavioral outcomes, especially by recognizing the preclinical and subclinical states of distress and dysfunction that portend a risk for failure of role performance or future mental disorders. Recommendations for data elements are divided into 3 tiers: core, supplemental, and emerging, including variable domains and specific measures for assessing operational stressor exposures, stress outcomes, moderating factors, and mediating processes. Attention is drawn to the emerging construct of stress injury as a generic term for subclinical operational stress, and to emerging data elements addressing biological, psychological, and spiritual mediators of risk. Methodologies are needed for identifying preclinical and subclinical states of distress or dysfunction that are markers of risk for failure of role performance and future clinical mental disorders, so that targeted prevention interventions can be developed and evaluated.

Mental health among commando, airborne and other UK infantry personnel

BACKGROUND

Despite having high levels of combat exposure, commando and airborne forces may be at less risk of mental ill-health than other troops.

AIMS

To examine differences in mental health outcomes and occupational risk factors between Royal Marines Commandos (RMCs), paratroopers (PARAs) and other army infantry (INF).

METHODS

Three groups of personnel (275 RMCs, 202 PARAs and 572 INF) were generated from a UK military cohort study of personnel serving at the time of the 2003 Iraq war. Participants completed a questionnaire about their mental health and experiences on deployment. Differences in mental health outcomes between the groups were examined with logistic regression and negative binomial regression analyses.

RESULTS

Both RMCs and PARAs were less likely to have multiple physical symptoms or to be fatigued, and RMCs also had lower levels of general mental health problems and lower scores on the Post-traumatic Checklist than INF personnel. Differences were not explained by the level of unit cohesion.

CONCLUSIONS

The effect of warfare on troops' well-being is not universal across occupational groups. A possible explanation for this difference is that the high level of preparedness in RMCs and PARAs may lessen the psychological impact of war-zone deployment experiences.

Factors associated with antisocial behavior in combat veterans

The objective of this study was to identify factors associated with antisocial behavior in 1,543 Marines who deployed to combat zones in support of conflicts in Iraq and Afghanistan during 2002-2007. Five factors were associated with antisocial behavior in multivariate analyses: post-traumatic stress disorder (PTSD) symptoms, deployment-related stressors, combat exposure, younger age, and being divorced. PTSD symptoms had a stronger association with antisocial behavior than any other variable. A unique and important finding of this study was the association between deployment-related stressors and a higher incidence of antisocial behavior. Because deployment-related stressors are potentially modifiable, the military may be able to address them in concrete ways such as by shortening deployments and improving communication with home.