Variation in completeness of coding external cause of injuries under ICD-10-CM.

INTRODUCTION: Information about causes of injury is key for injury prevention efforts. Historically, cause-of-injury coding in clinical practice has been incomplete due to the need for extra diagnosis codes in the International Classification of Diseases-Ninth Revision-Clinical Modification (ICD-9-CM) coding. The transition to ICD-10-CM and increased use of clinical support software for diagnosis coding is expected to improve completeness of cause-of-injury coding. This paper assesses the recording of external cause-of-injury codes specifically for those diagnoses where an additional code is still required. METHODS: We used electronic health record and claims data from 10 health systems from October 2015 to December 2021 to identify all inpatient and emergency encounters with a primary diagnosis of injury. The proportion of encounters that also included a valid external cause-of-injury code is presented. RESULTS: Most health systems had high rates of cause-of-injury coding: over 85% in emergency departments and over 75% in inpatient encounters with primary injury diagnoses. However, several sites had lower rates in both settings. State mandates were associated with consistently high external cause recording. CONCLUSIONS: Completeness of cause-of-injury coding improved since the adoption of ICD-10-CM coding and increased slightly over the study period at most sites. However, significant variation remained, and completeness of cause-of-injury coding in any diagnosis data used for injury prevention planning should be empirically determined.

Associations between feelings of safety, concerns about firearms on campus and suicidal thoughts and behaviours among college students.

BACKGROUND: Perceptions of safety on campus may be related to a variety of factors such as concerns about campus violence, especially firearm violence, and mental health, particularly suicidal thoughts and behaviours (STBs). The present analyses aim to describe associations between feelings of safety, concerns about firearms on campus and STBs among college students. METHODS: This study uses data from the American College Health Association-National College Health Assessment wave III (n=24 682 participants across k=29 schools). Multilevel logistic regressions and cumulative link mixed models examine the associations between feelings of safety, concerns about firearm violence on campus and presence of STBs in the past year. RESULTS: Participants who reported being concerned about firearm violence felt significantly less safe. Feeling unsafe at night was significantly associated with suicidal ideation and suicide attempts. Individuals with concerns about firearm safety on campus were up to 42% more likely to report suicidal ideation compared with those reporting they were not at all concerned about campus firearm violence. DISCUSSION: With associations highlighting increased risk of STBs among those with reduced safety feelings and heightened concerns about firearms, there is a need for college campuses to intervene and promote campus safety, with particular consideration for the presence of firearms on campus and the implications of allowing such weapons to be present in environments with increasing instances of firearm violence.

Regional differences in firearm ownership, storage and use: results from a representative survey of five US states.

BACKGROUND: Firearm access and storage practices influence risk for injury and death; however, prior research has considered only national and regional differences on these variables, overlooking state-level differences. OBJECTIVES: To analyse and describe statewide differences in firearm ownership, storage and use in a representative sample of five US states. DESIGN: Variables were assessed via an online self-report survey administered between 29 April 2022 and 15 May 2022. SETTING: Surveys were completed online. PARTICIPANTS: Participants (n=3510) were members of knowledge panel, a probability-based sample recruited to be representative of US adults. All participants were aged 18+ and resided in one of five states: Colorado, Minnesota, Mississippi, New Jersey or Texas. MEASUREMENTS: We used χ2 tests to examine state differences in firearm ownership, childhood firearm experiences and purchasing. A series of analyses of covariance were then used to assess differences in firearm storage, firearms owned and carrying behaviours while adjusting for pertinent demographic characteristics. RESULTS: We found significant differences in firearm ownership across states. There were significantly more first-time firearm purchasers during the firearm purchasing surge in New Jersey. Both Mississippi and Texas have elevated rates of unsecure storage practices and firearm carrying outside of the home. LIMITATIONS: Results are cross-sectional and self-report. Findings may not generalise beyond the five states assessed in this survey. CONCLUSIONS: Public health messaging around firearm safety should account for differences in key firearm behaviours related to ownership, storage and use to ensure effective communication and reduce the risk of gun injury and death across states.

Intimate partner violence and suicide mortality: a cross-sectional study using machine learning and natural language processing of suicide data from 43 states.

INTRODUCTION: Intimate partner violence (IPV) is associated with suicidal ideation, yet it remains unclear how often IPV precipitates suicide mortality. To overcome limitations with national data, we applied novel methods to: (1) document the prevalence of IPV-related suicide in the USA and (2) identify correlates for IPV-related suicide. METHODS: Using National Violent Death Reporting System data (NVDRS, 2015-2019, n=1 30 550), we recorded IPV circumstances (yes/no) by leveraging prior textual reviews of death narratives and applying a validated natural language processing tool. We could not systematically differentiate IPV perpetration versus victimisation given limited details in NVDRS. Logistic regression compared IPV-related suicides with referent group suicides (no evidence of IPV), stratified by sex. RESULTS: 7.1% of suicides were IPV related (n=9210), most were isolated suicide events (82.8%, n=7625; ie, not homicide suicide). There were higher odds of IPV circumstances when the decedent had civil legal problems (aOR for men: 3.6 (3.3 to 3.9), aOR for women: 2.6 (2.2 to 3.2)), criminal legal problems (aOR men: 2.3 (2.2 to 2.5), aOR for women: 1.7 (1.4 to 2.1)), or used a firearm (aOR men: 1.9 (1.8 to 2.0), aOR for women: 1.9 (1.7 to 2.1)). There were lower odds of IPV circumstances when the decedent had a current mental health problem (aOR men: 0.7 (0.7 to 0.8), aOR for women: 0.7 (0.6 to 0.8)). CONCLUSIONS: IPV circumstances contribute to a notable proportion of suicides. IPV-related suicides are distinct from other suicide deaths. Targeted suicide screening and intervention in IPV settings may be beneficial for prevention.

Circumstantial variables preceding firearm suicide among females with and without mobility disability in the USA: comparative analysis using data from the National Violent Death Reporting System.

BACKGROUND: Mobility disability impacts approximately 12% of the US population; females are overrepresented among persons with mobility disability. Those with mobility disability are at increased risk of suicide compared with their non-disabled counterparts. Suicide using a firearm has increased among females in the last two decades. This study aims to describe and explore significant circumstantial variables (eg, socio-demographic, health indicators) preceding firearm suicide among females with mobility disability as compared with females without mobility disability. METHODS: This is a secondary comparative, retrospective analysis of the narrative data from the National Violent Death Reporting System Restricted Access Database. Persons with mobility disability were identified through text mining and manual review and subsequently analysed with a summative form of content analysis. Pearson/Fisher's X2 or t-tests were used to assess differences in the circumstantial variables between those with and without mobility disabilities. RESULTS: Among female firearm suicide decedents, persons with mobility disability were more commonly older (p<0.001), identified as a homemaker (p<0.001), were perceived to be in a depressed mood before death (p<0.05), had a history of suicidal thoughts (p<0.05) and were perceived to have physical pain (p<0.001); they less commonly had relationship problems (p<0.05). CONCLUSIONS: Females with mobility disability who die by firearm suicide may be differentiated from suicide decedents without mobility disability by age, employment status, depressive mood, relationship problems and physical pain. The significance of these variables as independent risk factors for firearm suicide may be tested with prospective study designs, which in turn may inform the development of targeted or disability-inclusive prevention strategies.

Trends in mortality after emergency department presentation for suicidal behaviour in California.

INTRODUCTION: Emergency department patients presenting with non-fatal suicidal behaviour face elevated risk of suicide and all-cause mortality, but the extent to which this has changed over time is unknown. This study tracked trends in mortality risks faced by emergency department patients presenting with deliberate self-harm and suicidal ideation in California. METHODS: Using statewide linked emergency department and death data, we estimated 2010-2016 trends in suicide and all-cause mortality among emergency department patients with either deliberate self-harm (n=111 658) or suicidal ideation (n=162 959). We also calculated average annual percent changes in age-adjusted mortality rates and compared these to the general California population. RESULTS: Deliberate self-harm and suicidal ideation patients' age-adjusted suicide rates decreased by approximately 5% per year during the study period; however, their all-cause mortality trends were flat. In the general California population, suicide rate trends were flat while all-cause mortality slightly declined. CONCLUSIONS: Suicide mortality unexpectedly declined among self-harming and suicidal patients presenting to California emergency departments. Additional research is needed to understand the reasons behind this decline and inform quality improvement efforts for suicide prevention in hospital settings.

Locked and loaded: correlates of in-home firearm storage beliefs and behaviours.

OBJECTIVES: To understand how crime and victimisation fears and risks operate alongside social status threats and motivations to shape unsafe in-home firearm storage practices and beliefs. METHODS: Using data from firearm owners identified in a nationwide sample surveyed in 2023, this study examined how in-home loaded firearm accessibility, firearm storage practice and firearm safety beliefs are associated with: fear of crime and victimisation; perceived and personal victimisation; racial resentment; cultural and status threats; and masculinity threats. Regression models also accounted for the role of gender, race, marital status, political affiliation, geographic region and protective motivation for firearm ownership. RESULTS: Over 40% of firearm owners reported having a loaded firearm 'always accessible' at home, and almost half think homes with firearms are safer than those without. About one-third of owners reported storing firearms locked but still loaded. Crime and victimisation fears and threats were unrelated to firearm storage behaviours and beliefs; however, firearm owners who experience higher levels of sociocultural anxiety are more likely to always have a loaded firearm accessible at home, store firearms locked and loaded, and believe that firearms make homes safer. CONCLUSIONS: Identifying the barriers to safer storage beliefs and behaviours is essential for refining and enhancing effective firearm injury prevention strategies. Sociocultural anxieties may not reflect concrete threats to physical safety, but they can be experienced as feelings of insecurity, instability and distress that-for some Americans-may be managed by knowing they have a (loaded) firearm within reach.

Suicide poisoning mortality: a comparison of the national poison data system and centers for disease control national dataset.

The America's Poison Centres National Poison Data System (NPDS) is set up for the active surveillance of voluntarily reported poisoning cases in near real-time. The Centres for Disease Control and Prevention (CDC)'s Wide-ranging Online Data for Epidemiologic Research (WONDER) database is final national mortality data from state registries. We compared suicide poisoning deaths in both datasets from 2000 to 2020 and tested their relationship using a simple linear regression model. Mean annual suicide poisoning deaths during the review period were 699 (SD 145) in NPDS, and 6150 (SD 577) in WONDER. NPDS annual cases averaged 11% of cases recorded in WONDER (SD 2%; Range 8%-16%). The regression coefficient for the linear relationship between annual deaths recorded in both datasets was 0.18 (p-value<0.001, R2=0.51). The rapidly available NPDS data on fatal self-poisoning may provide sentinel surveillance regarding self-poisonings, but do not reliably predict final national data on suicide poisoning.

Law enforcement and firearms: understanding firearm ownership and storage habits.

OBJECTIVE: This study seeks to better understand firearm ownership among law enforcement officers (LEO), with the goal of informing future firearm injury and suicide prevention efforts. We describe the frequency and sociodemographic correlates of firearm ownership and storage practices among, and examine the association between suicidal ideation and current firearm storage practices. METHODS: The present study used data from a large online study (n=6410) and included data from individuals who were currently or previously being employed as an LEO (n=369; M (SD) age=39.2 y (15.8 y), 75.2% male, 66.7% white). Self-report measures were used to assess for firearm ownership, storage habits and suicidal ideation. Descriptive statistics were used to describe the frequency of firearm ownership and logistic regressions were used to examine the extent to which demographic characteristics and suicidal ideation were associated with firearm ownership. RESULTS: Overall, 70.5% (n=261) of the sample reported firearm ownership. LEO who were older had significantly lower odds of reporting firearm ownership. Those who were married and those who reported lifetime suicidal ideation had significantly greater odds of reporting firearm ownership. Whereas firearm-owning LEO who reporting storing a firearm locked had significantly lower odds of reporting lifetime suicidal ideation, those who reported storing a firearm unloaded had significantly greater odds of reporting lifetime suicidal ideation. CONCLUSION: Findings have important public health implications and can be used to increase adherence with secure storage recommendations. Increasing secure storage may help reduce suicide risk among LEO, a sample at heightened risk for suicide.

Epidemiological analysis of fatal and non-fatal firearm injuries occurring in gun establishments in the United States, 2015-2022.

BACKGROUND: Firearm-related injury represents a significant public health problem in the USA. Firearm purchasing has risen nationwide and there has been increased efforts to deploy injury prevention initiatives within gun establishments. However, firearm-related risks and harms that may occur inside these high-exposure settings are not well characterized. METHODS: This secondary analysis leveraged Gun Violence Archive data to quantify firearm injury prevalence rates within different types of gun establishments from 1 January 2015 to 31 December 2022. Data were restricted to incidents that occurred in gun ranges, gun shops, and public and private ranges. The following incident characteristics were available in the individual-level data: date, location, injury count, fatality count, victim demographics (age, sex), shooting intent (suicide/self-inflicted, assault/homicide, unintentional, undetermined) and establishment type. RESULTS: Over 7 years, 445 non-fatal and 183 fatal shooting events occurred across 576 unique establishments. Non-fatal, unintentional injuries predominated in stand-alone firing ranges whereas fatal, self-inflicted injuries concentrated in retail shops with accompanying firing ranges. Firearm-related assaults were prevalent among stand-alone retail shops. CONCLUSION: Overall, this secondary analysis underscores that the prevalence of firearm injury in gun establishments across the USA is low, and these settings should continue to be studied as important contexts for intervention. Interweaving public health interventions into gun establishments presents an opportunity to potentially reduce associated harms to consumers interacting within these environments.

Pregnancy-associated homicide, suicide and unintentional opioid-involved overdose deaths, North Carolina 2018-2019.

OBJECTIVE: Rates of death due to homicide, suicide and overdose during pregnancy and the first year postpartum have increased substantially in the USA in recent years. The aims of this study were to use 2018-2019 data on deaths identified for review by the North Carolina Maternal Mortality Review Committee (NC-MMRC), data from the North Carolina Violent Death Reporting System (NC-VDRS) and data from the Statewide Unintentional Drug Overdose Reporting System (NC-SUDORS) to examine homicide, suicide and unintentional opioid-involved overdose deaths during pregnancy and the first year postpartum. METHODS: We linked data from the 2018-2019 NC-MMRC to suicide and homicide deaths among women ages 10-50 years from the 2018-2019 NC-VDRS and to unintentional opioid-involved overdose deaths among women ages 10-50 years from the 2018-2019 NC-SUDORS. We conducted descriptive analyses to examine the prevalence of demographic characteristics and the circumstances surrounding each cause of death. RESULTS: From 2018 to 2019 in North Carolina, there were 23 homicides, nine suicides and 36 unintentional opioid-involved overdose deaths (9.7, 3.8 and 15.1 per 100 000 live births, respectively) during pregnancy and the first year postpartum. Most homicide deaths (87.0%) were by firearm, and more than half (52.5%) were related to intimate partner violence. More than two-thirds of women who died by suicide had a current mental health problem (77.8%). Less than one-fourth (22.2%) of those who died by unintentional opioid-involved overdose had a known history of substance use disorder treatment. CONCLUSION: Our approach to quantifying and describing these causes of pregnancy-associated death can serve as a framework for other states to inform data-driven prevention.

Quantifying relational change in community organisations participating in a Veteran suicide prevention learning collaborative: a social network analysis.

BACKGROUND: Veteran suicide remains a significant issue, as 17.5 Veterans die by suicide each day. The US Department of Veteran Affairs (VA) has implemented a robust suicide prevention program within its integrated behavioural health system. Further, the VA has increasingly contributed to suicide prevention in community settings, where a large proportion of Veterans receive health care and social services. One component integral to preventing suicide among Veterans receiving community services is ensuring that organisations are equipped with the latest evidence-based Veteran-specific suicide prevention strategies. METHODS: The Patient Safety Center of Inquiry-Suicide Prevention Collaborative piloted a Veteran suicide prevention learning collaborative in the Denver/Colorado Springs, CO region, spanning 16 months as a multimodal initiative to integrate community organisations and assist them in implementing Veteran suicide prevention strategies used within VA. Agencies completed social network analysis surveys at baseline (T1), year 1 (T2) and 16 months (T3) to examine social networks, partnerships and collaborations among community organisations and the VA over time. RESULTS: The quantity of learning collaborative relationships increased from 30 at T1 to 41 at T3 while the quality of relationships deepened over time from awareness and cooperative to more coordinated and integrated. CONCLUSION: Improvement in relationship quantity and quality facilitates community organisation engagement in collaborating to strengthen their Veteran suicide prevention programming. Learning collaboratives work with the individual organisation for intraorganisational facilitation of implementing suicide prevention strategies and engage and enhance interorganisational partnerships. This multimodal intervention can engage community organisations and provide a stronger safety net for Veterans at risk for suicide.

Relationship between family history of mandatory boarding school experiences and suicide risk in US reservation-based Native American youth: a cross-sectional analysis.

INTRODUCTION: Suicide is a leading cause of death among Native American youth and adolescents in the USA. A myriad of factors have been correlated with risk for suicide ideation (SI)/suicide attempt (SA), including historical trauma; however, accurate measurement of historical trauma has been inconsistent. OBJECTIVE: To examine the association of family history of a negative mandatory boarding school experience with SI and SAs. METHODS: An anonymous online survey was conducted with 288 Native youth aged 15-24 years from the Fort Peck Reservation in Montana. Multinomial regression was applied adjusting for other known risk and protective factors of SI and SAs. RESULTS: Thirty-five percent reported past SAs and 15% reported ideation without prior attempt. Of the 129 (45%) reporting a family history of mandatory boarding school experiences, 28% perceived the experience as positive while 22% as negative. After adjusting for risk and protective factors, both SI and SAs were associated with a family history of negative mandatory boarding school experiences (adjusted OR (AOR)=4.8 and 4.3, respectively) and polydrug use (AOR=3.6 and 2.3). SAs were also associated with post-traumatic stress disorder (AOR=2.6) and depressive symptoms (AOR=3.6). CONCLUSION: The association between family history of negative mandatory boarding school experiences and SI and SAs implies that culturally responsive interventions are needed to reduce the intergenerational impacts of historical trauma.

Firearm businesses as partners in suicide prevention: a cross-sectional study of the Gun Shop Project in Colorado, USA.

BACKGROUND: The Gun Shop Project aims to reduce firearm suicide and is widely implemented in the USA, yet little is known about the core firearm business practices and behaviours that might contribute to preventing firearm suicide. METHODS: Owners or managers of all firearm businesses identified as participants in Colorado's Gun Shop Project were invited to respond to a questionnaire. Data collection occurred from March to May 2021. Analyses included unweighted descriptive statistics with CIs and Pearson χ2 tests for categorical associations. RESULTS: 54 firearm businesses participated (response rate: 28%). Under half reported practices that are Gun Shop Project core aspects (range: 14%-45%). 22% of businesses frequently engaged customers on the importance of safe firearm storage in suicide prevention while 26% had denied a firearm sale and 14% had assisted with temporary secure storage in the past year with customers perceived to be in suicidal crisis. However, high proportions reported willingness to engage in these behaviours if a customer was in crisis: 74% were willing to refuse a sale of a firearm or ammunition, 70% were willing to discuss temporary secure storage options and 70% were willing to direct customers to mental health services. CONCLUSIONS: This study suggests that efforts to continue educating and involving firearm businesses may have an impact on the adoption of organisational suicide prevention practices and behaviours. Ongoing efforts are needed to understand core components of Gun Shop Project to inform standardised recommendations for effective firearm business practices that prevent firearm suicide.

Financial barriers and facilitators to secure firearm and medication storage among veterans with elevated suicide risk: a qualitative study.

OBJECTIVE: To explore financial barriers and facilitators to promoting secure firearm and medication storage among patients at risk for suicide. METHODS: Veterans seeking care in Veterans Affairs emergency care settings (N=28) participated in qualitative interviews on barriers and facilitators to adopting secure firearm and medication storage behaviours. Thematic analysis with inductive and iterative coding was used to identify themes pertaining to financial barriers and facilitators. Interviews were double-coded for reliability. RESULTS: We identified four themes-two related to financial barriers and two to financial facilitators. Barrier-related themes included: (1) the high cost of firearms and medications made owners less likely to dispose of medications, relinquish ownership of firearms or pursue out-of-home storage for firearms; (2) the high cost of out-of-home storage and preferred locking devices were barriers to secure storage. Facilitator-related themes included: (1) no-cost services or locking devices may help motivate secure firearm and medication storage and (2) preferences varied for no-cost locking devices versus coupons for devices. CONCLUSIONS: Addressing financial barriers and leveraging financial facilitators may motivate secure storage of lethal means, which could enhance suicide prevention efforts.

Views of voluntary, temporary out-of-home firearm storage among individuals living in a firearm-owning home: results from a qualitative study in two states.

INTRODUCTION: Firearms account for the majority of suicide deaths in the USA. A recommended approach for suicide prevention is reducing access to firearms by temporarily removing them from the home. We sought to understand how firearm owners and those who reside with them view and might use voluntary, temporary out-of-home firearm storage. METHODS: From July to November 2021, we interviewed English-speaking adults in Colorado and Washington who own firearms or reside with them, using semistructured interviews. We used a team-based mixed deductive and inductive approach to code transcripts and identify themes. RESULTS: Half of the 38 interviewees were men (53%) aged 35-54 years (40%); 92% identified as white. The average age that participants reported first having a firearm was 20.4 years; 16% reported never owning a firearm themselves, only living in homes with firearms. Qualitative findings fell into broad themes: (1) storage with family members/friends, (2) concerns/challenges with storing a firearm with a business/organization, (3) importance of trust (4) outreach methods for out-of-home storage programmes. CONCLUSION: Programmes for voluntary, temporary out-of-home firearm storage will not be impactful unless such storage is desired and used. Understanding views of potential storage users can help support development of acceptable and feasible programmes.

Self-harm in adolescence and risk of crash: a 13-year cohort study of novice drivers in New South Wales, Australia.

INTRODUCTION: Self-harm and suicide are leading causes of morbidity and death for young people, worldwide. Previous research has identified self-harm is a risk factor for vehicle crashes, however, there is a lack of long-term crash data post licensing that investigates this relationship. We aimed to determine whether adolescent self-harm persists as crash risk factor in adulthood. METHODS: We followed 20 806 newly licensed adolescent and young adult drivers in the DRIVE prospective cohort for 13 years to examine whether self-harm was a risk factor for vehicle crashes. The association between self-harm and crash was analysed using cumulative incidence curves investigating time to first crash and quantified using negative binominal regression models adjusted for driver demographics and conventional crash risk factors. RESULTS: Adolescents who reported self-harm at baseline were at increased risk of crashes 13 years later than those reporting no self-harm (relative risk (RR) 1.29: 95% CI 1.14 to 1.47). This risk remained after controlling for driver experience, demographic characteristics and known risk factors for crashes, including alcohol use and risk taking behaviour (RR 1.23: 95% CI 1.08 to 1.39). Sensation seeking had an additive effect on the association between self-harm and single-vehicle crashes (relative excess risk due to interaction 0.87: 95% CI 0.07 to 1.67), but not for other types of crashes. DISCUSSION: Our findings add to the growing body of evidence that self-harm during adolescence predicts a range of poorer health outcomes, including motor vehicle crash risks that warrant further investigation and consideration in road safety interventions. Complex interventions addressing self-harm in adolescence, as well as road safety and substance use, are critical for preventing health harming behaviours across the life course.

Impact of Sources of Strength on adolescent suicide deaths across three randomized trials.

Universal interventions are key to reducing youth suicide rates, yet no universal intervention has demonstrated reduction in suicide mortality through an RCT. This study pooled three cluster-RCTs of Sources of Strength (n=78 high schools), a universal social network-informed intervention. In each trial, matched pairs of schools were assigned to immediate intervention or wait-list. Six schools were assigned without a pair due to logistical constraints. During the study period, no suicides occurred in intervention schools vs four in control schools, that is, suicide rates of 0 vs. 20.86/100,000, respectively. Results varied across statistical tests of impact. A state-level exact test pooling all available schools showed fewer suicides in intervention vs. control schools (p=0.047); whereas a stricter test involving only schools with a randomised pair found no difference (p=0.150). Results suggest that identifying mortality-reducing interventions will require commitment to new public-health designs optimised for population-level interventions, including adaptive roll-out trials.

Detecting intimate partner violence circumstance for suicide: development and validation of a tool using natural language processing and supervised machine learning in the National Violent Death Reporting System.

BACKGROUND: Intimate partner violence (IPV) victims and perpetrators often report suicidal ideation, yet there is no comprehensive national dataset that allows for an assessment of the connection between IPV and suicide. The National Violent Death Reporting System (NVDRS) captures IPV circumstances for homicide-suicides (<2% of suicides), but not single suicides (suicide unconnected to other violent deaths; >98% of suicides). OBJECTIVE: To facilitate a more comprehensive understanding of the co-occurrence of IPV and suicide, we developed and validated a tool that detects mentions of IPV circumstances (yes/no) for single suicides in NVDRS death narratives. METHODS: We used 10 000 hand-labelled single suicide cases from NVDRS (2010-2018) to train (n=8500) and validate (n=1500) a classification model using supervised machine learning. We used natural language processing to extract relevant information from the death narratives within a concept normalisation framework. We tested numerous models and present performance metrics for the best approach. RESULTS: Our final model had robust sensitivity (0.70), specificity (0.98), precision (0.72) and kappa values (0.69). False positives mostly described other family violence. False negatives used vague and heterogeneous language to describe IPV, and often included abusive suicide threats. IMPLICATIONS: It is possible to detect IPV circumstances among singles suicides in NVDRS, although vague language in death narratives limited our tool's sensitivity. More attention to the role of IPV in suicide is merited both during the initial death investigation processes and subsequent NVDRS reporting. This tool can support future research to inform targeted prevention.

Hurricane Florence and suicide mortality in North Carolina: a controlled interrupted time-series analysis.

BACKGROUND: Natural disasters are associated with increased mental health disorders and suicidal ideation; however, associations with suicide deaths are not well understood. We explored how Hurricane Florence, which made landfall in September 2018, may have impacted suicide deaths in North Carolina (NC). METHODS: We used publicly available NC death records data to estimate associations between Hurricane Florence and monthly suicide death rates using a controlled, interrupted time series analysis. Hurricane exposure was determined by using county-level support designations from the Federal Emergency Management Agency. We examined effect modification by sex, age group, and race/ethnicity. RESULTS: 8363 suicide deaths occurred between January 2014 and December 2019. The overall suicide death rate in NC between 2014 and 2019 was 15.53 per 100 000 person-years (95% CI 15.20 to 15.87). Post-Hurricane, there was a small, immediate increase in the suicide death rate among exposed counties (0.89/100 000 PY; 95% CI -2.69 to 4.48). Comparing exposed and unexposed counties, there was no sustained post-Hurricane Florence change in suicide death rate trends (0.02/100 000 PY per month; 95% CI -0.33 to 0.38). Relative to 2018, NC experienced a statewide decline in suicides in 2019. An immediate increase in suicide deaths in Hurricane-affected counties versus Hurricane-unaffected counties was observed among women, people under age 65 and non-Hispanic black individuals, but there was no sustained change in the months after Hurricane Florence. CONCLUSIONS: Although results did not indicate a strong post-Hurricane Florence impact on suicide rates, subgroup analysis suggests differential impacts of Hurricane Florence on several groups, warranting future follow-up.