Outcome metrics utilized in evaluations of programs and interventions for combat and operational stress: A review of psychometric properties

The Department of Defense has mandated combat and operational stress control (COSC) efforts for the Services since 1999. Although several COSC-related programs have been implemented, few have undergone evaluation, and no standardized metrics have been established to assess their effectiveness and utility. The purpose of this review was to characterize the content and psychometrics of measures that have been utilized as outcome metrics in evaluations of COSC-related programs and interventions. Systematic literature searches were conducted for publications that: a) evaluated at least one measure from U.S. service members who participated in a program or intervention to prevent or reduce the adverse effects of combat and operational stress; and b) reported U.S. data on the internal consistency, test-retest reliability, convergent validity, and sensitivity/specificity of the identified measures. This process identified 15 measures for which psychometric properties were reviewed for acceptability based on recommended criteria. Identified measures varied from well-validated measures to newer instruments for which more data is needed on one or more of the target psychometric properties. Aside from internal consistency, psychometric data from U.S. military samples were sparse. Results further suggested that some measures might have reduced sensitivity in service members under certain conditions, such as large-scale screening. Additional studies are needed to validate COSC-relevant measures in service members. Future evaluations of programs and interventions for combat and operational stress should select measures that will increase the consistency of the literature, allow comparisons across studies, and ensure alignment with the objectives of identified programs.

Development and psychometric evaluation of the mental readiness for military transition scale (MT-Ready)

BACKGROUND

The transition to civilian life following separation from military service is associated with increased risk of mental health disorders, suicide, and poor adjustment. No measure currently enables pre-separation screening to assess mental readiness for transition and identify personnel most at risk of poor outcomes. The Mental Readiness for Military Transition Scale (MT-Ready) was developed to identify psychosocial factors predictive of post-separation psychological adjustment and mental health.

METHODS

Phase I was a qualitative study including transitioned veterans (n = 60), partners of transitioned veterans (n = 20) and mental health clinicians (n = 20) which enabled development of candidate items that were subsequently piloted with a current serving Australian Defence Force (ADF) sample (n = 19). Phase II included evaluation of the factor structure, psychometric properties, and scale refinement of the initial pool of 50 items with a convenience sample of transitioning ADF personnel (n = 345). Analyses included exploratory factor analysis, evaluation of test-retest reliability, internal consistency, convergent, divergent, discriminant and predictive validity. Receiver Operating Characteristic Curve Analysis was also conducted to determine an optimal cut-off score.

RESULTS

Exploratory factor analysis resulted in a 15-item, three-factor solution that explained 62.2% of the variance: Future focus and optimism; Anger and perceived failure; Civilian connections and social support. Reliability and convergent, divergent, and discriminant validity was established. Receiver Operating Characteristic Curve Analysis determined a cut-off score of 55. MT-Ready scores significantly differentiated those reporting adjusting versus not adjusting to civilian life 3.7 months post-separation, and predicted post-separation outcomes including symptoms of Posttraumatic Stress Disorder, depression, anxiety, psychological adjustment and quality of life.

CONCLUSIONS

This evaluation provides promising evidence the MT-Ready is a valid, reliable measure of mental readiness for transition, with predictive capability and considerable potential to assist prevention of poor post-separation outcomes among military personnel.

The Impact of Just and Unjust War Events on Mental Health Need and Utilization within U.S. Service Members

Background: Soldiers are resilient to just war events, such as killing enemy combatants and life-threatening experiences, but these same soldiers appear to struggle with unjust war events, such as killing a noncombatant or being unable to help civilian women and children in need. This study is the first to examine how just and unjust war experiences are associated with clinical health service outcomes. Methods: Two samples of soldiers in different stages of readjustment from deployment were drawn from a longitudinal, survey-based study of a US Army brigade. Measures included items related to combat events, mental health utilization, perceived mental health need, PTSD, depression, and functional impairment. Results: After controlling for other kinds of combat events, just war events (i.e., life-threatening events and killing enemy combatants) predicted outcomes in soldiers who are less than three months post-deployment, but only predicted 2 of 26 outcomes in soldiers one year post deployment. In contrast, unjust war events were found to be robust predictors of short-term and long-term outcomes related to mental health need and utilization, even after controlling for exposure to other combat events. Conclusions: The results extend previous longitudinal research that suggests that exposure to unjust war events carry a heavier long-term mental health burden than other types of events. Additionally, Soldiers exposed to unjust war events had an unmet need for care one year post deployment that was not directly tied to PTSD or depression. The results question the emphasis on life-threat within mental health pathogenesis models.

Development of StressCheck: A telehealth motivational enhancement therapy to improve voluntary engagement for PTSD treatment among active-duty service members

BACKGROUND

Rates of PTSD in active-duty military are high relative to the general population. Although efficacious treatments exist, they are underutilized. Many service members with PTSD do not present for treatment and, of those who do, many do not receive sufficient doses of the interventions to receive full benefits. Motivational Enhancement Therapy (MET) "check-ups", are brief interventions designed to elicit treatment engagement for those who are not treatment-seeking.

METHODS

StressCheck is an MET for nontreatment seeking Army and Air Force personnel. StressCheck aims to improve PTSD and increase treatment engagement, especially around evidence-based interventions, as well as to decrease stigma about seeking mental health services and improve knowledge about treatment options. This paper describes the intervention components and process of treatment development. The paper also describes next steps in testing the effectiveness of the intervention.

CONCLUSION

PTSD is associated with deleterious health, occupational, and psychological effects. If effective, this innovative intervention will bridge the gap between those who are not treatment seeking and existing services, thereby enhancing reach and impact of existing services.

CLINICALTRIALS

GOV IDENTIFIER

NCT03423394.

US Army Drill Sergeants: Stressors, Behavioral Health, and Mitigating Factors

INTRODUCTION

The role of the drill sergeant is one of the most challenging within the US Army, involving unusually long hours and little time off, for a minimum of 2 years. The current study sought to examine the behavioral health of this population and identify risk factors that might be addressed by policy changes.

MATERIALS AND METHODS

In total, 856 drill sergeants across all Army basic training sites completed surveys from September to November of 2018. Drill sergeants identified factors that had caused stress or worry during their assignment. Rates were measured for behavioral health outcomes including depression, insomnia, anxiety, burnout, functional impairment, alcohol misuse, aggression, and low morale. Potential risk and resilience factors included time as a drill sergeant, sleep, route of assignment, general leadership, health-promoting leadership, and drill sergeant camaraderie. The study was approved by the Walter Reed Army Institute of Research Institutional Review Board.

RESULTS

The most commonly experienced stressors were finding time to exercise, lack of sleep, and long work hours. Percentages of drill sergeants meeting behavioral health screening criteria were 19% for depression, 27% for moderate-to-severe insomnia, 14% for generalized anxiety disorder, 48% for high burnout, 32% for functional impairment, 35% for moderate alcohol misuse, 32% for off-duty aggression, and 25% for low morale. Rates for most outcomes were associated with time spent as a drill sergeant, with behavioral health issues peaking during 13-18 months. Poorer outcomes were also associated with fewer hours of sleep and initial unhappiness regarding involuntary assignment to the role of drill sergeant, while better outcomes were associated with higher ratings of general leadership, health-promoting leadership, and drill sergeant camaraderie.

CONCLUSIONS

This study is the first to examine behavioral health and morale of drill sergeants and to identify risk and resilience factors. Suggestions for policy changes include increasing the number of drill sergeants to decrease workload and allow sufficient time for recovery and sleep.

Methodology of the U.S. Army's Suicide Prevention Leadership Tool Study: The Behavioral Health Readiness and Suicide Risk Reduction Review (R4)

INTRODUCTION

The Secretary of the U.S. Army issued two directives in late 2017 to directly combat the problem of suicide in the U.S. Army. The first was to develop an Army tool to assist commanders and first-line leaders in preventing suicide and improving behavioral health (BH) outcomes, which has been previously published as the BH Readiness and Risk Reduction Review (R4). The second was to conduct an evaluation study of the tool with Army units in the field. This study is the first to empirically examine the Army's tool-based methods for identifying and caring for the health and welfare of soldiers at risk for suicide, and this article outlines the methodology employed to study the effectiveness of the R4 tools and accomplish the Secretary's second directive.

METHODS

The Walter Reed Army Institute of Research Institutional Review Board approved the R4 study. The study employed a repeated measurements in pre/post quasi-experimental design, including a nonequivalent but comparable business-as-usual control group. The R4 intervention consisted of the R4 tools, accompanying instructions, and an orientation. Samples were drawn from two geographically separated U.S. Army divisions in the continental United States, each composed of four comparable brigades. Study implementation consisted of three phases and three data collections over the course of 12 months. Soldiers completed anonymous survey instruments to assess a range of health factors, behaviors, characteristics, tool-related decision-making processes, and the frequency, type, and quality of interactions between soldiers and leaders.

RESULTS

The R4 study commenced on May 6, 2019, and concluded on June 4, 2020. Sample size goals were achieved for both the divisions at all three data collection time points.

CONCLUSIONS

The methodology of the R4 study is critical for the U.S. Army from both a precedential and an outcome-based standpoint. Despite the use of many previous tools and programs for suicide prevention, this is the first time the Army has been able to empirically test the effectiveness of tool-supported decision-making among Army units in a rigorous fashion. The methodology of such a test is a critical marker for future interventional inquiries on the subject of suicide in the Army, and the results will allow for more informed decision-making by leaders when approaching these ongoing challenges.

Distinguishing the Effects of Life Threat, Killing Enemy Combatants, and Unjust War Events in U.S. Service Members

Although previous studies have identified behavioral health risks associated with combat exposure, it is unclear which types of combat events are associated with these risks, particularly regarding contrasts among the risks associated with life-threatening experiences, killing combatants, and exposure to unjust war events, such as killing a noncombatant or being unable to help civilian women and children. In the present study, we examined surveys from 402 soldiers following deployment (i.e., baseline) and again 13 months later (i.e., Year 1). Regression analyses were conducted across a range of behavioral health (e.g., posttraumatic stress disorder, depression, suicide ideation, anxiety, somatic, insomnia, aggression) and benefit-finding measures, each controlling for two combat event categories while assessing the predictive utility of a third. The results suggested that life-threatening events were associated with poor behavioral health at baseline, relative risk (RR) = 10.00, but not at Year 1, RR = 2.67. At both baseline and Year 1, killing enemy combatants was not associated with behavioral health, RRs = 1.67-3.33, but was positively associated with benefit-finding, RRs = 26.67-40.00. Exposure to unjust war events was associated with a transdiagnostic pattern of behavioral health symptoms at baseline, RR = 40.00, and Year 1, RR = 23.33. Overall, the results suggest unjust war event exposure is particularly injurious, above and beyond exposure to other combat-related events. Future research can build on these findings to develop clearer descriptions of the combat events that might place service members at risk for moral injury and inform the development of assessment and treatment options.

Sleep and occupational well-being in active duty special operations soldiers: A replication and expansion

OBJECTIVE

To assess the relationship between sleep quality and occupational well-being in active duty military Service Members.

DESIGN

Longitudinal prospective analysis.

SETTING

An annual military training event.

PARTICIPANTS

US Army special operations Soldiers (n = 60; 100% male; age 25.41 ± 3.74).

INTERVENTION

None.

MEASUREMENTS

The Pittsburgh Sleep Quality Index (PSQI) was administered prior to the training event, and the Emotional Exhaustion Scale, the Role Overload Scale, the Walter Reed Army Institute of Research Soldier-Specific Functional Impairment Scale, and the Perceived Stress Scale were administered after the event. Linear regression models were used to assess the relationship between sleep and occupational wellness measures, and the outcome measures of "good" and "poor" sleepers (per the PSQI scoring criteria) were compared with Student's t tests.

RESULTS

Higher (poorer) PSQI Global Scores predicted poorer occupational wellness of all measures (emotional exhaustion: B = 1.60, P < .001, R² = 0.25; functional impairment: B = 0.29, P = .03, R² = 0.14; role overload: B = 0.28, P = .008, R² = 0.12; and perceived stress: B = 0.34, P = .004, R² = 0.20). There were additional relationships between specific PSQI component scores and occupational wellness measures, which is a replication of This team's previous work. Furthermore, emotional exhaustion (t(58) = -4.18, P < .001), functional impairment (t(59)= -3.68, P = .001), role overload (t(58) = -3.20, P = .002), and perceived stress (t(58) = -2.43, P = .02) were all higher in poor sleepers.

CONCLUSIONS

The findings of this study suggest that US Army special operations Soldiers who have poorer sleep quality may be at increased risk for having poorer occupational well-being.

Military sexual trauma among women Veterans: The buffering effect of coworker support

Prior research has demonstrated the impact of military sexual trauma (MST) on health and well-being. However, little empirical work has been published identifying protective factors for women who have experienced MST. We examined the impact of two different forms of MST, harassment-only and assault MST, on PTSD symptoms and social functional impairment in a sample of women Veterans employed in the civilian workforce. The effects of MST were examined at three different times over a period of 9 months. We found that MST that included both harassment and assault was associated with significantly higher levels of PTSD symptoms and social functional impairment across three different time points among women Veterans employed in civilian jobs. Further, the pattern of results suggested that coworker support can buffer against these negative outcomes experienced by women who reported assault MST. Overall, findings suggest that coworker support is one critical resource for women Veterans who experienced assault MST.

Assessing psychological adjustment and cultural reintegration after military service: development and psychometric evaluation of the post-separation Military-Civilian Adjustment and Reintegration Measure (M-CARM)

BACKGROUND

The transition out of military service and subsequent reintegration to civilian life has been established as a period associated with an increased risk of psychological adjustment difficulties, psychiatric disorders and suicide risk, yet no tool exists to measure cultural and psychological adjustment following permanent separation from the military. This study describes the two-phase mixed-methods development and validation of the self-report Military-Civilian Adjustment and Reintegration Measure (M-CARM).

METHODS

In Phase I, four focus groups (n = 20) and semi-structured one-on-one interviews (n = 80) enabled thematic analysis and generation of 53 initial items that were reviewed by an expert multidisciplinary panel (n = 12) and piloted for clarity and relevance in an Australian service-veteran sample (n = 11). In Phase II, psychometric properties of the 47 items resulting from Phase I were evaluated with online assessment of a convenience sample of transitioned Australian Defence Force veterans (n = 725). Analyses included exploratory and confirmatory factor analyses, as well as evaluation of test-retest reliability, internal consistency, and convergent, divergent and discriminant validity.

RESULTS

Exploratory factor analysis on a randomized split-half sample (n = 357), resulted in a 21-item, five-factor solution of Purpose and Connection, Help seeking, Beliefs about civilians, Resentment and regret, and Regimentation, explaining 53.22% of the variance. Confirmatory factor analysis (n = 368) verified this factor structure without modification (χ2 = 304.96, df = 160; CFI = .96, TLI = .94, NFI = .91, RMSEA = .05). Strong convergent, divergent and discriminant validity was demonstrated as M-CARM scores significantly correlated with related constructs assessed by standardised clinical measures as well as differentiated groups based on three binary reintegration items, with large effect sizes (d = > 1). Strong test-retest reliability for the total score (n = 186, r = .93) and excellent internal consistency (n = 725, a = .90) were also found.

CONCLUSIONS

Results provide promising evidence the M-CARM is a valid, reliable measure of psychological and cultural reintegration to civilian life, with potential for considerable clinical and research application.

Effect of the Wingman-Connect Upstream Suicide Prevention Program for Air Force Personnel in Training: A Cluster Randomized Clinical Trial

IMPORTANCE

Suicide has been a leading manner of death for US Air Force personnel in recent years. Universal prevention programs that reduce suicidal thoughts and behaviors in military populations have not been identified.

OBJECTIVES

To determine whether the Wingman-Connect program for Airmen-in-training reduces suicidal ideation, depression, and occupational problems compared with a stress management program and to test the underlying network health model positing that cohesive, healthy units are protective against suicidal ideation.

DESIGN, SETTING, AND PARTICIPANTS

This cluster randomized clinical trial was conducted from October 2017 to October 2019 and compared classes of personnel followed up for 6 months. The setting was a US Air Force technical training school, with participants studied to their first base assignment, whether US or international. Participants in 216 classes were randomized, with an 84% retention rate. Data analysis was performed from November 2019 to May 2020.

INTERVENTIONS

The Wingman-Connect program used group skill building for cohesion, shared purpose, and managing career and personal stressors (3 blocks of 2 hours each). Stress management training covered cognitive and behavioral strategies (2 hours). Both conditions had a 1-hour booster session, plus text messages.

MAIN OUTCOMES AND MEASURES

The primary outcomes were scores on the suicidal ideation and depression scales of the Computerized Adaptive Test for Mental Health and self-reports of military occupational impairment. Class network protective factors hypothesized to mediate the effect of Wingman-Connect were assessed with 4 measures: cohesion assessed perceptions that classmates cooperate, work well together, and support each other; morale was measured with a single item used in other studies with military samples; healthy class norms assessed perceptions of behaviors supported by classmates; and bonds to classmates were assessed by asking each participant to name classmates whom they respect and would choose to spend time with.

RESULTS

A total of 215 classes including 1485 individuals (1222 men [82.3%]; mean [SD] age, 20.9 [3.1] years) participated; 748 individuals were enrolled in the Wingman-Connect program and 737 individuals were enrolled in the stress management program. At 1 month, the Wingman-Connect group reported lower suicidal ideation severity (effect size [ES], -0.23; 95% CI, -0.39 to -0.09; P = .001) and depression symptoms (ES, -0.24; 95% CI, -0.41 to -0.08; P = .002) and fewer occupational problems (ES, -0.14; 95% CI, -0.31 to -0.02; P = .02). At 6 months, the Wingman-Connect group reported lower depression symptoms (ES, -0.16; 95% CI, -0.34 to -0.02; P = .03), whereas the difference in suicidal ideation severity was not significant (ES, -0.13; 95% CI, -0.29 to 0.01; P = .06). The number needed to treat to produce 1 fewer participant with elevated depression at either follow-up point was 21. The benefits of the training on occupational problems did not extend past 1 month. The Wingman-Connect program strengthened cohesive, healthy class units, which helped reduce suicidal ideation severity (estimate, -0.035; 95% CI, -0.07 to -0.01; P = .02) and depression symptom scores (estimate, -0.039; 95% CI, -0.07 to -0.01; P = .02) at 1 month.

CONCLUSIONS AND RELEVANCE

Wingman-Connect is the first universal prevention program to reduce suicidal ideation and depression symptoms in a general Air Force population. Group training that builds cohesive, healthy military units is promising for upstream suicide prevention and may be essential for ecological validity. Extension of the program to the operational Air Force is recommended for maintaining continuity and testing the prevention impact on suicidal behavior.

TRIAL REGISTRATION

ClinicalTrials.gov Identifier: NCT04067401.

Psychological predictors of functional outcomes in service members with traumatic brain injury

PRIMARY OBJECTIVE

Research is increasingly demonstrating the significant impact that non-medical factors can have on outcomes of service members (SMs) with mild traumatic brain injury (mTBI). Thus, the current study examined which demographic, TBI-related factors, and psychological variables are most predictive of functional outcomes.

RESEARCH DESIGN

Retrospective database analysis from medical chart review.

METHODS AND PROCEDURES

One hundred forty-one patients who received rehabilitation services at an outpatient TBI military treatment facility between 2013 and 2018. Data collected included demographic variables, time since injury, neuropsychological measures, psychological diagnoses, Personality Assessment Inventory (PAI) scores, and Walter Reed Functional Impairment Scale (FIS). Hierarchical linear regression models were used to predict functional outcomes (measured by FIS total, work, social functioning scales).

MAIN OUTCOMES AND RESULTS

Results indicated that comorbid PTSD diagnosis and PAI Negative Impression Management (NIM) score were predictive of total functional, work, and social outcomes, over and above demographic and TBI-related factors.

CONCLUSIONS

Current findings confirmed the importance of evaluating and treating psychological factors, as well as exploring one's responding style (NIM), when managing chronic mTBI in SMs. Given ongoing findings of psychological underpinnings to mTBI outcome, there is further need to focus on early interventions to optimize psychological and functional outcomes for SMs.

Poor Subjective Sleep Quality Is Associated with Poor Occupational Outcomes in Elite Soldiers

We aimed to assess the relationship between subjective sleep quality and occupationally-relevant outcomes in military personnel. Participants were from an elite unit of US Army soldiers who worked extended (~30 h) shifts (with minimal recovery time between shifts) during 3-week work sessions. Questionnaires assessing subjective sleep quality during the month prior (Pittsburgh Sleep Quality Index [PSQI]) were administered at the beginning of the session. Occupational outcomes (emotional exhaustion, functional impairment, role overload, daytime sleepiness) were assessed on the final day of the session. Regression analyses were conducted to link sleep quality and occupational outcomes. The study sample participants had relatively poor sleep prior to the exercise (PSQI Global score average = 6.3 ± 3.1). Higher PSQI Global Scores prior to the work session longitudinally predicted daytime sleepiness (f2: 0.56) after the work session. PSQI component 7, which queries daytime dysfunction attributed to poor sleep quality, longitudinally predicted emotional exhaustion, functional impairment, and role overload (f2 range: 0.19-0.70). In conclusion, poor sleep quality-in aggregation with occupationally-mandated sleep loss-is predictive of poorer subsequent occupational outcomes. Future work should aim to increase sleep opportunities prior to occupationally-mandated sleep loss in order to build resilience when sleep loss is unavoidable.

Sleep disturbance mediates the association of adverse childhood experiences with mental health symptoms and functional impairment in US soldiers

Adverse childhood experiences (ACEs) can have long-term impacts on a person's mental health, which extend into adulthood. There is a high prevalence of ACEs among service members. Further, service members also report frequently experiencing disrupted sleep. We hypothesized that disrupted sleep may serve a mechanistic function connecting ACEs to functional impairment and poorer mental health. In a cross-sectional sample (n = 759), we found evidence for an indirect effect of ACEs on mental health outcomes through disrupted sleep. In a different sample using two time-points (n = 410), we found evidence for an indirect effect of ACEs on changes in mental health outcomes and functional impairment during a reset period, through changes in disrupted sleep during the same period. Implications, limitations and future research directions are discussed.

Can Anger Be Helpful?: Soldier Perceptions of the Utility of Anger

Studies have found that soldiers returning from combat deployment report elevated levels of anger and aggression. The present study examined the perception that anger was helpful in performing occupationally related duties and whether this perception was associated with mental health problems, somatic symptoms, and functioning. Soldiers (N = 627) completed a survey 4 months after their deployment to Afghanistan and again 3 months later. When examining anger over time, findings revealed four groups of different latent classes: low stable (resilient), high stable (chronic), decreasing over time (improved), and increasing over time (delayed problems). For two of the groups (chronic and delayed problems), perceiving anger as helpful was closely related to anger reactions. Perceiving anger as helpful was also associated with worse mental health symptoms. Further work in understanding how to mitigate this positive perception of anger in prevention initiatives may be useful in addressing anger reactions.

World Health Organization disability assessment schedule 2.0: An international systematic review

PURPOSE

This systematic review examines research and practical applications of the World Health Organization Disability Assessment Schedule (WHODAS 2.0) as a basis for establishing specific criteria for evaluating relevant international scientific literature. The aims were to establish the extent of international dissemination and use of WHODAS 2.0 and analyze psychometric research on its various translations and adaptations. In particular, we wanted to highlight which psychometric features have been investigated, focusing on the factor structure, reliability, and validity of this instrument.

METHOD

Following Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) methodology, we conducted a search for publications focused on "whodas" using the ProQuest, PubMed, and Google Scholar electronic databases.

RESULTS

We identified 810 studies from 94 countries published between 1999 and 2015. WHODAS 2.0 has been translated into 47 languages and dialects and used in 27 areas of research (40% in psychiatry).

CONCLUSIONS

The growing number of studies indicates increasing interest in the WHODAS 2.0 for assessing individual functioning and disability in different settings and individual health conditions. The WHODAS 2.0 shows strong correlations with several other measures of activity limitations; probably due to the fact that it shares the same disability latent variable with them. Implications for Rehabilitation WHODAS 2.0 seems to be a valid, reliable self-report instrument for the assessment of disability. The increasing interest in use of the WHODAS 2.0 extends to rehabilitation and life sciences rather than being limited to psychiatry. WHODAS 2.0 is suitable for assessing health status and disability in a variety of settings and populations. A critical issue for rehabilitation is that a single "minimal clinically important .difference" score for the WHODAS 2.0 has not yet been established.

Disability and Mental Disorders in the Canadian Armed Forces

OBJECTIVES

The initial goal was to validate the use of a self-report measure of disability in the Canadian Armed Forces (CAF). The main goal was to document the extent of disability in personnel with and without mental disorders.

METHODS

Data were obtained from the 2013 Canadian Forces Mental Health Survey; the sample included 6700 Regular Forces personnel. Disability was measured with the 12-item version of the World Health Organization Disability Assessment Schedule (WHODAS-2); established cut points were used to demarcate severe, moderate, minimal, and no disability. The following recent (past-year) and remote (lifetime but not past-year) disorders were assessed with diagnostic interviews: posttraumatic stress disorder, major depressive episode, generalized anxiety disorder, panic disorder, and alcohol use disorder.

RESULTS

The WHODAS-2 showed good internal consistency (α = 0.89) and a 1-factor structure. Most personnel had no disability (59.2%) or minimal disability (30.8%). However, an important minority had moderate or severe disability (8.4% and 1.6%, respectively). Individuals with recent disorders reported greater disability than those without lifetime disorders, although many had minimal or no disability (41.2% and 24.7%, respectively). Disability increased with the number of recent disorders. Relative to those without lifetime disorders, individuals with remote disorders showed slightly greater disability, but most had no disabilty (57.1%) or minimal disability (35.0%).

CONCLUSIONS

The 12-item WHODAS-2 is a valid measure of disability in the CAF. Mental disorders may be important drivers of disability in this population, although limited residual disability is seen in individuals with remote disorders.

The prevalence of post-traumatic stress disorder (PTSD) in US combat soldiers: a head-to-head comparison of DSM-5 versus DSM-IV-TR symptom criteria with the PTSD checklist

BACKGROUND

The definition of post-traumatic stress disorder (PTSD) underwent substantial changes in the 2013 edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). How this will affect estimates of prevalence, whether clinical utility has been improved, and how many individuals who meet symptom criteria according to the previous definition will not meet new criteria is unknown. Updated screening instruments, including the PTSD checklist (PCL), have not been compared with previously validated methods through head-to-head comparisons.

METHODS

We compared the new 20-item PCL, mapped to DSM-5 (PCL-5), with the original validated 17-item specific stressor version (PCL-S) in 1822 US infantry soldiers, including 946 soldiers who had been deployed to Iraq or Afghanistan. Surveys were administered in November, 2013. Soldiers alternately received either of two surveys that were identical except for the order of the two PCL versions (911 per group). Standardised scales measured major depression, generalised anxiety, alcohol misuse, and functional impairment.

RESULTS

In analysis of all soldiers, 224 (13%) screened positive for PTSD by DSM-IV-TR criteria and 216 (12%) screened positive by DSM-5 criteria (κ 0·67). In soldiers exposed to combat, 177 (19%) screened positive by DSM-IV-TR and 165 (18%) screened positive by DSM-5 criteria (0·66). However, of 221 soldiers with complete data who met DSM-IV-TR criteria, 67 (30%) did not meet DSM-5 criteria, and 59 additional soldiers met only DSM-5 criteria. PCL-5 scores from 15-38 performed similarly to PCL-S scores of 30-50; a PCL-5 score of 38 gave optimum agreement with a PCL-S of 50. The two definitions showed nearly identical association with other psychiatric disorders and functional impairment.

CONCLUSIONS

Our findings showed the PCL-5 to be equivalent to the validated PCL-S. However, the new PTSD symptom criteria do not seem to have greater clinical utility, and a high percentage of soldiers who met criteria by one definition did not meet the other criteria. Clinicians need to consider how to manage discordant outcomes, particularly for service members and veterans with PTSD who no longer meet criteria under DSM-5.

FUNDING

US Army Military Operational Medicine Research Program (MOMRP), Fort Detrick, MD.