The signal detection analysis showed that treatment credibility
and baseline health anxiety were significant predictors of clinically
significant improvement. Participants scoring above 38 on the Cscale
and below 110 on the HAI had the highest probability of being
clinically significant improved (83%). In comparison, only 12% of
participants with a C-scale score below 39 and a HAI score above
104 were clinically significant improved. These findings suggest
that the patient's view of the treatment's credibility is of high
importance regardless of baseline levels of health anxiety. However,
when treatment credibility is low and initial symptoms are
severe it is especially important that the clinician monitors the
progress of the treatment and makes efforts to enhance treatment
credibility.