Table 3.

Inclusion and exclusion criteria.

Inclusion	Exclusion
Original studies with primary research.	Any studies that took place outside the UK.
Any studies that included paramedics or ambulance staff.	Any studies that did not specify the type of emergency worker or did not talk specifically about paramedics or ambulance staff.
UK-based studies.	Any studies that did not find humour as an affecting factor on well-being.