Table 1

Eligibility criteria

Inclusion criteria	Exclusion criteria
Aged 10–19 years. ‘Cases’ who presented to acute paediatric hospital setting in mental health crisis(defined as: having reached ‘breaking point’, likely to harm themselves or others and behaviours that feel out of control, including extreme anxiety or panic attacks; psychotic episodes; hypomania or mania and acts of suicide or self-harm). ‘Non-cases’ presenting to acute paediatric setting not in mental health crisis but with a primary physical medical illness or injury(defined as a health problem having physical origins, which can be short-term (accidental injury, influenza, migraine, infections) or long term (eg, diabetes, asthma, arthritis)).	Unable to speak or comprehend English language. Currently receiving active end of life care. Considered too medically ill by clinicians.

Inclusion criteria

Exclusion criteria

Aged 10–19 years.
‘Cases’ who presented to acute paediatric hospital setting in mental health crisis(defined as: having reached ‘breaking point’, likely to harm themselves or others and behaviours that feel out of control, including extreme anxiety or panic attacks; psychotic episodes; hypomania or mania and acts of suicide or self-harm).
‘Non-cases’ presenting to acute paediatric setting not in mental health crisis but with a primary physical medical illness or injury(defined as a health problem having physical origins, which can be short-term (accidental injury, influenza, migraine, infections) or long term (eg, diabetes, asthma, arthritis)).