Table 1. Self-harm and mental health variables available in the NASS dataset.

Patient and case details
Case details	Patient details	Scene details	Physical condition
Case number	Gender	Public / private	Fatal event
Case date and time	Age	Indoor / outdoor	Pulse rate
Transport to hospital	Residential postcode	Event postcode and coordinates	Respiratory rate
Non-transport reason		Police co-attendance	Glasgow Coma Scale
		Others on scene	Naloxone administered
		Minors on scene	Naloxone responsive
Case classification during ambulance attendance
Mental health	Self-harm
	Self-harm and alcohol or other drug poisoning	Suicidal intent or planning*	Self-harm method**
Anxiety	Suicide	Not applicable	Intentional alcohol and other drug poisoning
			Hanging
Depression	Suicide attempt	Evidence of intent	Vehicular impact
			Laceration/penetrating wound
		Evidence of intent, but denied
			Jumping from height
			Carbon monoxide poisoning
Psychosis	Suicidal ideation	Suicide plan
			Other poisoning
			Firearm
		No suicide plan
			Drowning
			Burning
		Unknown if plan exists	Asphyxia
			Other
Other/unspecified	Self-injury	Evidence of intent	Intentional alcohol and other drug poisoning
			Laceration/penetrating wound
		Evidence of intent, but denied	Burning
			Asphyxia
			Bodily impact
			Ingestion of foreign body#
			Other
	Unintentional AOD poisoning	n/a
	Undetermined intent AOD poisoning	n/a
Relevant history and risk indicators
Self-harm history	Mental health history	Current risk indicators	Lifetime risk indicators
Suicide attempt	Anxiety	Agitation	Culturally/linguistically diverse
Suicidal ideation	Post-traumatic stress disorder	Poor social support	Military service history
Self-injury	Obsessive compulsive disorder	Emergency mental health team	Foster care/state guardianship
Alcohol and other drug poisoning: unintentional/ undetermined intent	Bipolar disorder	Link to health services	Post-prison release
	Depression	Housing problem	Refugee background
	Schizophrenia	Unemployment	Suicidal exposure
	Other/unspecified psychosis	Bereavement	Intellectual impairment
	Borderline personality disorder	Family problem	Acquired brain injury
	Other personality disorder	Chronic pain	Dementia
	Alcohol and other drug misuse	Sleeping problems	Developmental disorder
	Eating disorder	Financial problems
	Other / unspecified indicator	Gambling problems
		In custody
		Bullying
		Other / unspecified indicator

* Intent relates to suicidal attempt and self-injury; planning relates to suicidal ideation.

**For suicide, suicide attempt and suicidal ideation, the method pertains to the self-harm method that was undertaken by the patient. For suicidal ideation, the method pertains to the self-harm method that was planned by the patient.

^#Excludes alcohol and other drug or other poisons.

Variables that are used directly from ambulance service data provision, and do not undergo additional coding within the NASS, are shown in italics.