At least three methodological problems affect the study by Katsavouni et al. (2016). First, there are currently no diagnostic criteria for burnout, neither in the DSM-5, nor in the ICD-10. Second, one extremely important variable was omitted from this study of firefighters, namely, depression. Third, the authors did not control for relevant nonoccupational factors such as stressors occurring outside of work.
Schonfeld, Irvin Sam and Bianchi, Renzo, "Burnout in Firefighters: A Word on Methodology" (2016). CUNY Academic Works.