UK Biobank is a well-characterised cohort of over 500 000 participants including genetics, environmental data and imaging. An online mental health questionnaire was designed for UK Biobank participants to expand its potential.

Describe the development, implementation and results of this questionnaire.

An expert working group designed the questionnaire, using established measures where possible, and consulting a patient group. Operational criteria were agreed for defining likely disorder and risk states, including lifetime depression, mania/hypomania, generalised anxiety disorder, unusual experiences and self-harm, and current post-traumatic stress and hazardous/harmful alcohol use.

A total of 157 366 completed online questionnaires were available by August 2017. Participants were aged 45–82 (53% were ≥65 years) and 57% women. Comparison of self-reported diagnosed mental disorder with a contemporary study shows a similar prevalence, despite respondents being of higher average socioeconomic status. Lifetime depression was a common finding, with 24% (37 434) of participants meeting criteria and current hazardous/harmful alcohol use criteria were met by 21% (32 602), whereas other criteria were met by less than 8% of the participants. There was extensive comorbidity among the syndromes. Mental disorders were associated with a high neuroticism score, adverse life events and long-term illness; addiction and bipolar affective disorder in particular were associated with measures of deprivation.

The UK Biobank questionnaire represents a very large mental health survey in itself, and the results presented here show high face validity, although caution is needed because of selection bias. Built into UK Biobank, these data intersect with other health data to offer unparalleled potential for crosscutting biomedical research involving mental health.

The SALT Triage system has been advocated as an easy-to-use sorting and treatment system for mass casualty incidents (MCI). Minimally injured (GREEN) patients tend to be in the majority and may cause impediments to access and treatment of the most critically injured (RED). By identifying flaws in MCI communications that impair effective patient care, responders can be more effective.

To discover strategies that effectively manage the minimally injured and leverage their help, increasing triage efficiency and treatment of the immediate casualties.

Direct observation, after-action debriefing, and literature search.

The literature was vague regarding recommendations on a bystander and trained provider communication best practices. Feedback from standardized patients (actors) and participants during a structured debriefing following a 2018 American Society of Anesthesiology MCI exercise suggested that triaging providers under stress may communicate poorly, contributing to increased patient anxiety, disruptive behavior, and less effective team dynamics during a disaster. Strategies suggested include: eye contact; therapeutic touch (culturally appropriate); using slow, clear, reassuring speech; clearly explaining what is happening and why (sickest (RED and YELLOW) first priority, minimal (GREEN) next, expectant (BLACK) last); acknowledging their emotional state and their grief (not ignoring them); assigning nontechnical tasks to those capable of helping (putting pressure on a wound, moving casualties, or comforting the injured, dying, and the emotionally distraught).

Bystander engagement has been repeatedly identified as a means to increase the capacity of first responders to provide care to patients during an MCI. Utilization and management of the minimally injured and any uninjured bystanders and responders can become a force multiplier for the triage/treating responders. Developing a best practice dialogue to be used in training first responders could help improve many of these issues and augment current MCI training programs.