Rate of cognitive decline in premotor Parkinson's disease: A prospective study (NEDICES)

Álvaro Sánchez-Ferro, Julián Benito-León, Elan D. Louis, Alex J. Mitchell, José Antonio Molina-Arjona, Rocío Trincado, Alberto Villarejo, Félix Bermejo-Pareja

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Previous research has documented cognitive impairment in the early stages of Parkinson's disease (PD). It is not known when this decline starts or if decline progresses at an accelerated rate during the premotor period of the disorder. In this population-based prospective study of older people (≥65 years) from the Neurological Disorders in Central Spain (NEDICES) cohort, we compared the rates of cognitive decline in 3 groups: (1) non-PD elderly controls; (2) prevalent PD patients (those diagnosed with the disease at baseline, 1994-95); and (3) premotor PD subjects (those diagnosed with the disease at follow up, 1997-98, but not at baseline). A 37-item version of the Mini-Mental State Examination (37-MMSE) was administered in the 2 visits of the study. From 2487 participants (age, 72.8 ± 6.0 years), including 2429 controls, we recruited 21 premotor PD cases, and 37 prevalent PD cases. At baseline, the mean 37-MMSE score was 28.5 ± 4.7 in prevalent cases, 28.1 ± 4.6 in premotor cases, and 29.9 ± 5.0 in controls (P = .046). During the 3-year follow-up period, there was a significant score decline of 2.4 ± 4.6 points in prevalent cases versus 0.2 ± 4.1 points in premotor cases and 0.3 ± 4.0 points in controls (Kruskal-Wallis test, P = .03). In the NEDICES cohort, cognitive test scores of prevalent PD cases declined at a rate above and beyond that observed in premotor PD cases and in controls. The rate of cognitive decline in premotor PD and controls was similar. Our data suggest that a decline in global cognitive function does not occur in premotor PD.

Original languageEnglish (US)
Pages (from-to)161-168
Number of pages8
JournalMovement Disorders
Issue number2
StatePublished - Feb 2013
Externally publishedYes


  • Cognitive function
  • Elderly
  • Epidemiology
  • Parkinson's disease
  • Population-based study
  • Premotor symptoms

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology


Dive into the research topics of 'Rate of cognitive decline in premotor Parkinson's disease: A prospective study (NEDICES)'. Together they form a unique fingerprint.

Cite this