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

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...