Mental health at work: societal, economic and health imperatives align; it's time to act.

The enormous impact of mental illness on work and productivity is a global challenge, with immense costs to wider society. Now is the time for action, with new international guidelines and an emergent consensus on occupational mental healthcare. Alongside governments, organisations and employers, psychiatrists have a leading role to play.

Experiences of working from home: umbrella review.

INTRODUCTION: The concept of "working from home" is extremely topical following the COVID-19 pandemic; therefore, it is unsurprising that there has been an increased interest in collating research related to homeworking. This has been carried out by multiple reviews, all with slightly different research aims and methodologies. Collating the findings from the available reviews is therefore highly beneficial to establish the experience of homeworking to create recommendations for the future of home-based work. METHODS: An umbrella review was carried out. In June 2022, literature searches were conducted across 4 electronic databases. Published reviews of literature that used a systematic process, were focused on working from home populations, and detailed factors that could be related to the personal experience of homeworking (eg, barriers, facilitators, advantages, disadvantages) were included. RESULTS: A total of 1930 records were screened and 6 review articles were included. Results report on the following sections: working environment (eg, workplace design, space conditions), personal impact (eg, satisfaction, career impact), and health (eg, physical health, well-being) including a total of 19 themes. Mixed findings were apparent for nearly all included themes, highlighting the need to consider individual and contextual circumstances when researching working from home. CONCLUSIONS: This review establishes the importance of retaining flexibility while homeworking for employees, managers, and organizations. Essentially, a one-size-fits-all approach to working from home is impractical as individual circumstances limit application. Eight recommendations for the future of working from home are suggested.

Recurrence of post-traumatic stress disorder: systematic review of definitions, prevalence and predictors.

BACKGROUND: Many people will experience a potentially traumatic event in their lifetime and a minority will go on to develop post-traumatic stress disorder (PTSD). A wealth of literature explores different trajectories of PTSD, focusing mostly on resilient, chronic, recovered and delayed-onset trajectories. Less is known about other potential trajectories such as recurring episodes of PTSD after initial recovery, and to date there has been no estimate of what percentage of those who initially recover from PTSD later go on to experience a recurrence. This systematic review aimed to synthesise existing literature to identify (i) how 'recurrence' of PTSD is defined in the literature; (ii) the prevalence of recurrent episodes of PTSD; and (iii) factors associated with recurrence. METHODS: A literature search of five electronic databases identified primary, quantitative studies relevant to the research aims. Reference lists of studies meeting pre-defined inclusion criteria were also hand-searched. Relevant data were extracted systematically from the included studies and results are reported narratively. RESULTS: Searches identified 5,398 studies, and 35 were deemed relevant to the aims of the review. Results showed there is little consensus in the terminology or definitions used to refer to recurrence of PTSD. Because recurrence was defined and measured in different ways across the literature, and prevalence rates were reported in numerous different ways, it was not possible to perform meta-analysis to estimate the prevalence of recurrence. We also found no consistent evidence regarding predictors of PTSD recurrence. CONCLUSION: A clear and consistent evidence-based definition of recurrence is urgently needed before the prevalence and predictors of recurrence can be truly understood.

Is lifetime traumatic brain injury a risk factor for mild cognitive impairment in veterans compared to non-veterans?

Background: Traumatic brain injury (TBI) is prevalent in veterans and may occur at any stages of their life (before, during, or after military service). This is of particular concern, as previous evidence in the general population has identified TBI as a strong risk factor for mild cognitive impairment (MCI), a known precursor of dementia.Objectives: This study aimed to investigate whether exposure to at least one TBI across the lifetime was a risk factor for MCI in ageing UK veterans compared to non-veterans.Method: This cross-sectional study comprised of data from PROTECT, a cohort study comprising UK veterans and non-veterans aged ≥ 50 years at baseline. Veteran and TBI status were self-reported using the Military Service History Questionnaire (MSHQ) and the Brain Injury Screening Questionnaire (BISQ), respectively. MCI was the outcome of interest, and was defined as subjective cognitive impairment and objective cognitive impairment.Results: The sample population comprised of veterans (n = 701) and non-veterans (n = 12,389). TBI was a significant risk factor for MCI in the overall sample (OR = 1.21, 95% CI 1.11-1.31) compared to individuals without TBI. The prevalence of TBI was significantly higher in veterans compared to non-veterans (69.9% vs 59.5%, p < .001). There was no significant difference in the risk of MCI between veterans with TBI and non-veterans with TBI (OR = 1.19, 95% CI 0.98-1.45).Conclusion: TBI remains an important risk factor for MCI, irrespective of veteran status. The clinical implications indicate the need for early intervention for MCI prevention after TBI.

Data from the PROTECT study, a longitudinal study comprising over 25,000 middle-aged and ageing adults in the UK, were used in this first UK comparative study to explore the association between a lifetime history of traumatic brain injury (TBI) and mild cognitive impairment (MCI) in UK veterans and non-veterans.Lifetime TBI was more prevalent in veterans compared to non-veterans. TBI events in military veterans could be attributed to non-military events.Exposure to a history of TBI irrespective of veteran status increased the risk of MCI by 21% compared to adults with no history of TBI.The risk of MCI did not significantly differ between veterans and non-veterans with TBI.

Evaluation of Community Reinforcement and Family Therapy in the UK military community.

Background: Partners and family can play a key role in encouraging military service and ex-service personnel to seek help for their mental health. Community Reinforcement Approach and Family Training (CRAFT) was developed to equip concerned significant others (CSOs) of those experiencing substance use disorders with skills to encourage their loved one to enter treatment and improve their own well-being. It was adapted in the US for CSOs of ex-service personnel with post-traumatic stress disorder (PTSD) (VA-CRAFT).Objective: This study aimed to evaluate an adaptation of VA-CRAFT for use with CSOs of serving and ex-service personnel experiencing PTSD and Common Mental Disorders in the UK (UKV-CRAFT).Method: Acceptability of UKV-CRAFT was assessed with interviews with experts, namely key stakeholders (n = 15) working in support provision for serving and ex-service personnel. In addition, individuals who took part in a small-scale demonstrative trial of UKV-CRAFT (three CSOs and three facilitators who delivered UKV-CRAFT) provided feedback.Results: UKV-CRAFT was viewed positively, with interviewees highlighting that programmes like UKV-CRAFT filled a gap in provision for UK Armed Forces families as most services were only available to the serving or ex-service personnel. Interviewees praised how UKV-CRAFT enhanced CSO well-being and communication with their loved one. Concerns over the confidentiality of taking part in UKV-CRAFT were raised due to the perceived negative effects of highlighting a loved one's mental ill health, especially for CSOs of serving personnel. Ideas for improvement included broadening access to all CSOs regardless of whether their loved one was seeking treatment.Conclusion: Interviewees regarded UKV-CRAFT as a potentially useful intervention suggesting it could be proactively offered universally to support timely help-seeking if required. We recommend further evaluation of UKV-CRAFT on a wider scale, incorporating our recommendations, to assess its effectiveness accurately.

Community Reinforcement And Family Therapy (CRAFT), a programme for the concerned significant others (CSOs) of people experiencing Substance Abuse Disorders (SUDs), was adapted for the CSOs of UK Armed Forces serving and ex-service personnel (UKV-CRAFT).UKV-CRAFT aimed to equip CSOs with the skills to encourage their Armed Forces loved ones to seek mental health treatment; it was evaluated by post-trial interviews with UKV-CRAFT facilitators, recipients, and Armed Forces stakeholders.UKV-CRAFT was found to be a useful intervention for CSOs but would benefit from further evaluation on a wider scale.Evaluation of Community Reinforcement And Family Therapy in the UK military community.

"Exceptionally challenging time for all of us": Qualitative study of the COVID-19 experiences of partners of diplomatic personnel.

BACKGROUND: Although the romantic partners of diplomatic personnel frequently accompany their spouses to overseas postings and face the challenges of having to adjust to new cultures and separation from friends and family, they have rarely been the focus of academic research. This study explores the lived experiences of the partners/spouses of diplomatic personnel from the United Kingdom's Foreign, Commonwealth and Development Office (FCDO) during the COVID-19 pandemic. METHODS: Partners of FCDO staff took part in semi-structured interviews about how COVID-19 had affected their lives and their perceptions of the organisation's response to the pandemic. Thematic analysis was used to analyse the data. RESULTS: Eleven partners of FCDO staff took part, who between them had lived in 14 different countries during the pandemic. The analysis identified six key themes: deployment-specific challenges such as travel restrictions, quarantine and evacuation; children; impacts of the pandemic including financial and psychological; perceptions of the organisational response to COVID-19; support and help-seeking; and suggestions for the future. Overall participants reported experiencing a number of challenges, many of which left them feeling powerless and not in control of their own lives. Participants frequently described a lack of clarity around policies and support. Social support appeared to be valuable, but many participants wanted more support from the organisation and from informal networks. CONCLUSIONS: Diplomatic (and similar) organisations could enhance the wellbeing of the partners of their staff through improved communication and support. Keeping families informed about restrictions, requirements, policies and available help during a crisis, and reaching out to them to offer advice and support, would likely be beneficial. It is important that lessons are learned from the COVID-19 crisis in order for organisations to be able to support their employees and families if another prolonged crisis were to occur.

Gender differences in structural and attitudinal barriers to mental healthcare in UK Armed Forces personnel and veterans with self-reported mental health problems.

PURPOSE: Structural and attitudinal barriers often hinder treatment-seeking for mental health problems among members of the Armed Forces. However, little is known about potential gender differences in structural and attitudinal barriers among members of the UK Armed Forces. The current study aimed to explore how men and women differ in terms of these barriers to care among a sample of UK Armed Forces personnel and veterans with self-reported mental health problems. METHODS: Currently serving and ex-serving members of the UK Armed Forces who self-reported a mental health problem were invited to participate in a semi-structured phone interview on mental health and treatment-seeking. The final sample included 1448 participants (1229 men and 219 women). All participants reported on their current mental health, public stigma, self-stigma, and barriers to mental healthcare. RESULTS: Overall, men and women reported similar levels of both structural and attitudinal barriers, with no significant differences detected. The highest scores for both men and women were observed in attitudinal barriers relating to self-stigma domains, which encapsulate internalised attitudes and beliefs about mental illness and treatment. CONCLUSIONS: Findings suggest that anti-stigma campaigns can be targeted simultaneously at both men and women within the Armed Forces. In particular, targeting self-stigma may be beneficial for health promotion campaigns.

The Well-Being of Companion Animal Caregivers and Their Companion Animals during the COVID-19 Pandemic: Scoping Review.

It is important to understand the effects of the COVID-19 pandemic on animal caregivers and their companion animals in order to inform responses to future crises. Prior research is inconsistent, with the benefits of animal companionship believed to be overstated. In this scoping review, we searched four electronic databases and hand-searched reference lists of included studies. Over 4000 citations were found, and 122 were included in the review. Reflecting on the pre-COVID literature, quantitative evidence of the association between psychological well-being and animal companionship during the pandemic was mixed, with numerous positive, negative, and null findings reported. Studies highlighted the benefits of animal companionship during the pandemic, with animals reported to provide their caregivers with a routine, a sense of greater purpose, a positive distraction from COVID-19, companionship, and emotional support. However, participants also reported concerns about meeting animals' needs, fears of animals catching or spreading the virus, and financial worries. Concerns about what would happen to animals if caregivers were hospitalized led some to delay COVID-19 testing or treatment. Animals also experienced benefits (such as increased companionship and calmer mood) and negative impacts (such as increased clinginess and separation anxiety). Companion animals should be a key consideration in emergency preparedness plans.

The DrinksRation Smartphone App for Modifying Alcohol Use Behaviors in UK Military Service Personnel at Risk of Alcohol-Related Harm: Protocol for a Randomized Controlled Trial.

BACKGROUND: Consumption of alcohol is synonymous with military populations, and studies have shown that serving personnel drink more than age- and sex-matched civilian populations. While ingrained in the military culture, excessive alcohol use is associated with increased rates of disciplinary issues, sickness absence, and loss of productivity, as well as contributing to a burden of acute and chronic health problems. Alcohol brief interventions can reduce alcohol use in civilian populations, but there is a paucity of evidence relating to the effectiveness of similar interventions in military populations. The DrinksRation smartphone app was designed to have a basis in behavior change technique theory and focuses on providing interactive behavioral prompts tailored to a military population. It has previously been shown to be effective in a help-seeking veteran population. OBJECTIVE: The primary aim of the Military DrinksRation randomized controlled trial study is to determine whether it is similarly effective in a serving military population. METHODS: We compare the effectiveness of the DrinksRation smartphone app with treatment as usual for personnel identified at risk of alcohol-related harm using the Military DrinksRation study that is a 2-arm, single-blind, 1:1 randomized controlled trial of the UK Armed Forces population. It is hypothesized that the DrinksRation app will be more efficacious at reducing alcohol consumption compared to treatment as usual. Recruitment will be predominantly from routine, periodic dental inspections all service personnel regularly undertake, supplemented by recruitment from military-targeted media messaging. The primary outcome is the change in alcohol units consumed per week between baseline and day 84, measured using the timeline follow-back method. Secondary outcome measures are a change in the Alcohol Use Disorders Identification Test score, a change in the quality of life assessment, and a change in drinking motivations and app usability (intervention arm only) between baseline and day 84. A final data collection at 168 days will assess the persistence of any changes over a longer duration. RESULTS: The study is expected to open in August 2023 and aims to enroll 728 participants to allow for a study sample size requirement of 218 per arm and a 40% attrition rate. It is expected to take up to 12 months to complete. The results will be published in 2024. CONCLUSIONS: The Military DrinksRation study will assess the efficacy of the smartphone app on changing alcohol use behaviors in service personnel. If a positive effect is shown, the UK Defence Medical Services would have an effective, evidence-based tool to use as part of an alcohol management clinical pathway, thereby providing better support for military personnel at risk of harm from alcohol drinking. TRIAL REGISTRATION: ISRCTN Registry 42646;. https://doi.org/10.1186/ISRCTN14977034. INTERNATIONAL REGISTERED REPORT IDENTIFIER (IRRID): PRR1-10.2196/49918.

Health and well-being of serving and ex-serving UK Armed Forces personnel: protocol for the fourth phase of a longitudinal cohort study.

INTRODUCTION: This is the fourth phase of a longitudinal cohort study (2022-2023) to investigate the health and well-being of UK serving (Regulars and Reservists) and ex-serving personnel (veterans) who served during the era of the Iraq and Afghanistan conflicts. The cohort was established in 2003 and has collected data over three previous phases including Phase 1 (2004-2006), Phase 2 (2007-2009) and Phase 3 (2014-2016). METHODS AND ANALYSIS: Participants are eligible to take part if they completed the King's Centre for Military Health Research Health and Wellbeing Cohort Study at Phase 3 (2014-2016) and consented to be recontacted (N=7608). Participants will be recruited through email, post and text message to complete an online or paper questionnaire. Data are being collected between January 2022 and September 2023. Health and well-being measures include measures used in previous phases that assess common mental disorders, post-traumatic stress disorder (PTSD) and alcohol misuse. Other areas of interest assess employment, help-seeking and family relationships. New topics include the impact of the British withdrawal from Afghanistan in 2021, complex PTSD (C-PTSD), illicit drug use, gambling and loneliness. Analyses will describe the effect size between groups deployed to Iraq and/or Afghanistan or not deployed, and those who are currently in service versus ex-service personnel, respectively, reporting prevalences with 95% CIs, and ORs with 95% CI. Multivariable logistic and multiple linear regression analyses will be conducted to assess various health and well-being outcomes and associations with risk and protective factors. ETHICS AND DISSEMINATION: Ethical approval has been granted by the Ministry of Defence Research Ethics Committee (Ref: 2061/MODREC/21). Participants are provided with information and agree to a series of consent statements before taking part. Findings will be disseminated to UK Armed Forces stakeholders and international research institutions through stakeholder meetings, project reports and scientific publications.

Restore and Rebuild (R&R) - a feasibility pilot study of a co-designed intervention for moral injury-related mental health difficulties.

BACKGROUND: Moral injury can significantly negatively impact mental health, but currently no validated treatment for moral injury-related mental health difficulties exists in a UK context. This study aimed to examine whether the Restore and Rebuild (R&R) treatment was feasible to deliver, acceptable and well tolerated by UK military veterans with moral injury related mental health difficulties. METHOD: The R&R treatment was delivered to 20 patients who reported distress related to exposure to a morally injurious event(s) during military service. R&R is a 20-session psychotherapy with key themes of processing the event, self compassion, connecting with others and core values. Treatment was delivered online, weekly, one-to-one by a single therapist. Qualitative interviews with patients and the therapist who delivered R&R were conducted to explore acceptability and analysed using thematic analysis. RESULTS: Following treatment, patients experienced a significant reduction in symptoms of post-traumatic stress disorder, depression, alcohol misuse and moral injury related distress. R&R was found to be well tolerated by patients and improved their perceived wellbeing. CONCLUSIONS: These results provide preliminary evidence that veterans struggling with moral injury related mental ill health can benefit from R&R treatment.

Evidence before this study: Moral injury can negatively impact the mental health of military veterans. Currently no validated treatment for moral injury related mental health difficulties exists for UK military personnel/veterans.Added value of this study: Restore and Rebuild (R&R) is a co-designed psychotherapy for moral injury-related mental health difficulties. This study provides the first evidence that R&R treatment is associated with a significant improvement in patient symptoms of PTSD, depression, alcohol misuse and moral injury related distress. R&R was feasible to deliver, acceptable to patients and well tolerated.Implications of all the available evidence: These results provide preliminary evidence that veterans struggling with moral injury related mental ill health can benefit from R&R treatment. With further evaluation, R&R may be beneficial to other occupational groups affected by moral injury.

Recommendations for Setting a Criterion and Assessing Commutability of Sample Materials Used in External Quality Assessment/Proficiency Testing Schemes.

It is important for external quality assessment materials (EQAMs) to be commutable with clinical samples; i.e., they should behave like clinical samples when measured using end-user clinical laboratory in vitro diagnostic medical devices (IVD-MDs). Using commutable EQAMs makes it possible to evaluate metrological traceability and/or equivalence of results between IVD-MDs. The criterion for assessing commutability of an EQAM between 2 IVD-MDs is that its result should be within the prediction interval limits based on the statistical distribution of the clinical sample results from the 2 IVD-MDs being compared. The width of the prediction interval is, among other things, dependent on the analytical performance characteristics of the IVD-MDs. A presupposition for using this criterion is that the differences in nonselectivity between the 2 IVD-MDs being compared are acceptable. An acceptable difference in nonselectivity should be small relative to the analytical performance specifications used in the external quality assessment scheme. The acceptable difference in nonselectivity is used to modify the prediction interval criterion for commutability assessment. The present report provides recommendations on how to establish a criterion for acceptable commutability for EQAMS, establish the difference in nonselectivity that can be accepted between IVD-MDs, and perform a commutability assessment. The report also contains examples for performing a commutability assessment of EQAMs.

Recommendations for Setting a Criterion for Assessing Commutability of Secondary Calibrator Certified Reference Materials.

A secondary higher-order calibrator is required to be commutable with clinical samples to be suitable for use in the calibration hierarchy of an end-user clinical laboratory in vitro diagnostic medical device (IVD-MD). Commutability is a property of a reference material that means results for a reference material and for clinical samples have the same numeric relationship, within specified limits, across the measurement procedures for which the reference material is intended to be used. Procedures for assessing commutability have been described in the literature. This report provides recommendations for establishing a quantitative criterion to assess the commutability of a certified reference material (CRM). The criterion is the maximum allowable noncommutability bias (MANCB) that allows a CRM to be used as a calibrator in a calibration hierarchy for an IVD-MD without exceeding the maximum allowable combined standard uncertainty for a clinical sample result (umaxCS). Consequently, the MANCB is derived as a fraction of the umaxCS for the measurand. The suitability of an MANCB for practical use in a commutability assessment is determined by estimating the number of measurements of clinical samples and CRMs required based on the precision performance and nonselectivity for the measurand of the measurement procedures in the assessment. Guidance is also provided for evaluating indeterminate commutability conclusions and how to report results of a commutability assessment.

Moral Injuries in Healthcare Workers: What Causes Them and What to Do About Them?

Moral injury (MI) refers to the persisting distress which may occur following exposure to potentially morally injurious events (PMIEs). The COVID-19 pandemic has drawn attention to MI in healthcare workers, who have been found to experience more frequent PMIEs in their day-to-day work than those in other occupational groups such as the military. These events may occur on an individual, team, organizational or system level and have been associated with increased clinician burnout and distress, and poor psychological wellbeing. This paper focuses on healthcare workers' experiences of MI, including potential causes and ways to reduce them. There are myriad challenges that influence the development of MI, such as chronic understaffing and the pressure to treat high numbers of patients with limited resources. There are also multiple impacts of MI: at the individual-level, MI can lead to increased staff absences and understaffing, and prolonged patient contact with limited decision-making power. COVID-19 exacerbated such impacts, with a lack of organizational support during a time of increased patient mortality, and uncertainty and heightened pressure on the clinical frontline associated with scarce resources and understaffing. Potential methods for reduction of MI in healthcare workers include pre-exposure mitigation, such as fostering work environments which treat PMIEs in the same way as other occupational hazards and post-exposure mitigation, such as facilitating healthcare workers to process their experiences of PMIEs in peer support groups or with spiritual advisors and, if MI is associated with mental ill-health, talking therapies using trauma-focused and compassion-oriented frameworks.

'Thrown in at the deep end': a qualitative analysis into the transition from trainee to consultant during the COVID-19 pandemic and lessons for the future.

Background: Sustained crises such as the COVID-19 pandemic would be expected to impact the transition from trainee to consultant for anaesthetists or intensivists, but limited research exists on this important topic. This study aimed to examine the social context of this crucial career transition during the pandemic and post-pandemic periods. Methods: We conducted semi-structured interviews with anaesthetists and intensivists who became consultants after the first UK lockdown. Thematic analysis was used and data saturation was reached at 33 interviews. Results: The pandemic substantially impacted the transition to consultant role in various ways, including professional identity, clinical and non-clinical responsibilities, and wellbeing. Participants experienced identity confusion, self-doubt, and moral injury, resulting in intense emotional distress, feelings of guilt and helplessness, which persisted beyond the pandemic. They also felt unprepared for their consultant roles because of disruptions in training. The pandemic exaggerated the vulnerability of those transitioning to consultants, because of increased clinical uncertainties, and pressures of the growing backlog. Additionally, the pandemic impacted on the wellbeing of those transitioning to consultants, intensifying feelings of anxiety and stress. We also identified unique opportunities presented by the pandemic, which accelerated learning and encouraged post-traumatic growth. Our study identified practical solutions that may improve transition experience at individual, organisational, and national levels. Conclusions: Persistent crises significantly impact the transition from trainee to consultant. Our findings generated insights into the challenges of this critical career transition and staff wellbeing, and serve to inform approaches of ongoing support for those transitioning to consultants.

Evaluating a Smartphone App (MeT4VeT) to Support the Mental Health of UK Armed Forces Veterans: Feasibility Randomized Controlled Trial.

BACKGROUND: Previous research demonstrates that less than 50% of military veterans experiencing mental health difficulties seek formal support. Veterans often struggle to identify problems as mental health difficulties. In addition, they may fail to recognize the need for support before reaching a crisis point and face difficulties navigating care pathways to access support. OBJECTIVE: A feasibility trial was conducted to assess a novel digital smartphone app (Mental Health Toolkit for Veterans Project [MeT4VeT]) for UK Armed Forces (UKAF) veterans experiencing mental health difficulties. The trial aimed to explore the feasibility and acceptability of trial procedures for a later randomized controlled trial (RCT) and to assess the acceptability of the MeT4VeT app. METHODS: Participants were recruited at UK military medical centers, by advertising on social media, and through veteran third-sector organizations between February and November 2021, and assessed for eligibility (male, owned a smartphone, served at least 2 years in the UKAF, left the UKAF within the last 2 years, not undertaking formal mental health treatment). Eligible participants were assigned, on a 1:1 ratio, to either the intervention group (full app) or a control group (noninteractive app with signposting information). Three key objectives were determined a priori to assess the practicality of running an RCT including an assessment of recruitment and retention, evaluation of the technical app delivery and measurement processes, and acceptability and usability of the intervention. RESULTS: In total, 791 individuals completed the participant information sheet, of which 261 (33%) were ineligible, 377 (48%) declined or were unable to be contacted for consent, and 103 (13%) did not download the app or complete the baseline measures. Of this, 50 participants completed baseline measures and were randomly assigned to the intervention group (n=24) or the control group (n=26). The trial was effective at enabling both the technical delivery of the intervention and collection of outcome measures, with improvements in mental health demonstrated for the intervention group from baseline to the 3-month follow-up. Recruitment and retention challenges were highlighted with only 50 out of the 530 eligible participants enrolled in the trial. The acceptability and usability of the MeT4VeT app were generally supported, and it was reported to be a useful, accessible way for veterans to monitor and manage their mental health. CONCLUSIONS: The results highlighted that further work is needed to refine recruitment processes and maintain engagement with the app. Following this, an RCT can be considered to robustly assess the ability of the app to positively affect mental health outcomes indicated within this trial. TRIAL REGISTRATION: ClinicalTrials.gov NCT05993676; https://clinicaltrials.gov/ct2/show/NCT05993676.