Agreement between the abbreviated and standard portland digit recognition test

This study sought to determine the classification agreement between the standard and abbreviated forms of the Portland Digit Recognition Test (PDRT), a well-established symptom validity test. PDRTs (N=200: 100 traumatic brain injury, 100 chronic pain) were randomly selected from case manager and attorney referrals for psychological assessment. Only three cases were misclassified and agreement was as high as 99.5%. This study demonstrated that when using the abbreviated PDRT there is little risk of false negative errors.