To be involved in the study, the psychologists had to agree to
follow all the study protocols including the Treatment Manual.
They could all contact the research team for help and support at any
time. They were also required to complete checklists of what they
completed in the treatment sessions to encourage adherence.
Twenty nine (24 female, 5 male) clinical psychologists provided
treatment in the study. The mean number of years since completing
training was 10.9 years (SD ¼ 8.79), and 37.5% had treated a client
for headaches before becoming involved in the research. Treatment
was administered in the practices of the psychologists, and Medicare
Australia was bulk billed for the treatment sessions.