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Validity of the Telephone Interview for Cognitive Status (TICS) in post-stroke subjects
- Authors:
- BARBER Mark, STOTT David J.
- Journal article citation:
- International Journal of Geriatric Psychiatry, 19(1), January 2004, pp.75-79.
- Publisher:
- Wiley
Cognitive impairment and dementia are very common after stroke. Telephone screening has potential advantages for clinical follow-up and population-based research in this group. We wished to test the validity of the Telephone Interview for Cognitive Status (TICS) for cognitive testing in post-stroke subjects. Cognitive function in stroke outpatients was assessed using the R-CAMCOG (a modification of the cognitive part of the Cambridge Examination for Mental Disorders of the Elderly, for use in stroke subjects) along with the TICS and a modified version, the TICSm. The tests were administered in random order. A cut-off point of 33 on the R-CAMCOG was used to define post-stroke dementia. Sixty-four patients with a median age of 72 years were assessed. The Pearson correlation coefficients between the R-CAMCOG and the TICS and TICSm were 0.833 and 0.855 (both p <0.001) respectively. Twenty-four (38%) patients met R-CAMCOG criteria for post-stroke dementia. The area under the ROC curve for both the TICS and TICSm was 0.94. Using a cut-off of 28 or less on the TICS produced a sensitivity of 88% and a specificity of 85% for the diagnosis of post-stroke dementia. For the TICSm a cut-off of 20 or lower produced a sensitivity of 92% and a specificity of 80%. The TICS and TICSm telephone questionnaires are practicable and valid methods of assessing cognitive function in community outpatients following stroke. Scores of 28 and 20 respectively carry good sensitivity and specificity for the diagnosis of post-stroke dementia.