The influence of different error estimates in the detection of post-operative cognitive dysfunction using reliable change indices with correction for practice effects. Academic Article uri icon

Overview

abstract

  • The reliable change index (RCI) expresses change relative to its associated error, and is useful in the identification of post-operative cognitive dysfunction (POCD). This paper examines four common RCIs that each account for error in different ways. Three rules incorporate a constant correction for practice effects and are contrasted with the standard RCI that had no correction for practice. These rules are applied to 160 patients undergoing coronary artery bypass graft (CABG) surgery who completed neuropsychological assessments preoperatively and 1 week post-operatively using error and reliability data from a comparable healthy non-surgical control group. The rules all identify POCD in a similar proportion of patients, but the use of the within subject standard deviation, expressing the effects of random error, as an error estimate is a theoretically appropriate denominator when a constant error correction, removing the effects of systematic error, is deducted from the numerator in a RCI.

publication date

  • July 20, 2006

Research

keywords

  • Cognition Disorders
  • Coronary Artery Bypass
  • Data Interpretation, Statistical
  • Neuropsychological Tests
  • Outcome and Process Assessment, Health Care
  • Practice, Psychological

Identity

Scopus Document Identifier

  • 33747620724

Digital Object Identifier (DOI)

  • 10.1016/j.acn.2006.05.004

PubMed ID

  • 16859888

Additional Document Info

volume

  • 21

issue

  • 5