The British Journal of Psychiatry
Tardive dyskinesia: fluctuating patient or fluctuating rater.
J A Bergen, D A Griffiths, J M Rey, P J Beumont

Abstract

Tardive dyskinesia (TD) is usually described as fluctuating in its clinical manifestations. We attempted to quantify fluctuations in TD using the Abnormal Involuntary Movement Scale (AIMS). Three psychiatrists rated multiple video-recorded examinations of four outpatients with mild TD. The unexpected finding was that within-rater variability dominated within-patient variability.