Underdiagnosis of mild cognitive impairment: A consequence of ignoring practice effects.

ABSTRACT:

Introduction

Longitudinal testing is necessary to accurately measure cognitive change. However, repeated testing is susceptible to practice effects, which may obscure true cognitive decline and delay detection of mild cognitive impairment (MCI).

Methods

We retested 995 late-middle-aged men in a ∼6-year follow-up of the Vietnam Era Twin Study of Aging. In addition, 170 age-matched replacements were tested for the first time at study wave 2. Group differences were used to calculate practice effects after controlling for attrition effects. MCI diagnoses were generated from practice-adjusted scores.

Results

There were significant practice effects on most cognitive domains. Conversion to MCI doubled after correcting for practice effects, from 4.5% to 9%. Importantly, pract

SUBMITTER: Elman JA 

PROVIDER: S-EPMC6039708 | biostudies-literature | 2018

REPOSITORIES: biostudies-literature