Summary Profile of Standard Subtests in the Boston Diagnostic Aphasia Examination Record Booklet to get percentiles. The percentiles are listed as 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, and 100 only. The scores that are collected are a tally of the number of correct responses, the number of cues given, number of phonemic cues, etc. Reliability Reliability of the subtests was studied by selecting protocols of 34 patients with a degree of severity of aphasia ranging from slight to severe. Kuder-Richardson reliability coefficients for subtests ranged from 0.68 to 0.98, with about two-thirds of the coefficients reported ranging from 0.90 upwards. Since test-retest reliability is difficult if not impossible to attain in patients with aphasic symptoms, the current reliability coefficients demonstrate good internal consistency in terms of what the items within the subtests are measuring. Validity Validity: A discriminant analysis comparing "unambiguous exemplars of a single syndrome" was carried out. Thus, unambiguous cases of Broca's aphasia, Wernicke's aphasia, conduction aphasia, and anomic aphasia were selected. Ten variables were selected on the assumption of providing the most useful data. From these, five variables were selected for the discriminant analysis (body part identification, repetition of high probability sentences, verbal paraphasias, articulatory agility rating, and automated sentence rating). This classification yielded no misclassifications. Norms Standardization of the revised Boston Diagnostic Aphasia Examination is based on a normative sample of 242 patients with aphasic symptoms tested at the Boston VA Medical Center between 1976 and 1982. References In Depth Review of the Boston Diagnostic Aphasia Examination (BDAE) - Stroke Engine. (2015). Retrieved November from Further reading Medical tests Aphasias Communication disorders Neurological disorders Alexia (condition) Language disorders Symptoms and signs: Speech and voice Neuropsychological tests