Testing normal older people three or four times at 1- to 2-year intervals: Defining normal variance

Robert J. Ivnik, Glenn E. Smith, J. A. Lucas, Ronald C. Petersen, Bradley F. Boeve, E. Kokmen, Eric G. Tangalos

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

Normative data were presented that defined the upper and lower standards for deciding if cognitive abilities show reliable change over 2 or more testing occasions when retesting occurs at 1- to 2-year intervals. The Mayo Cognitive Factor Scores (MCFS; G. E. Smith et al., 1994) were analyzed because they permit the quantitation of overall functioning in 5 clinically important cognitive domains: established verbal knowledge, nonverbal reasoning, attention and concentration, new learning, and delayed memory. To the authors' knowledge, this is the first report of both group-level and individual-level data analyses derived from a respectably sized sample of normal persons who have been tested 3 or more times at clinically common test-retest intervals.

Original languageEnglish (US)
Pages (from-to)121-127
Number of pages7
JournalNeuropsychology
Volume13
Issue number1
DOIs
StatePublished - Jan 1 1999

ASJC Scopus subject areas

  • Neuropsychology and Physiological Psychology

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