Table 1.

Prevalence and cognitive profile of PD-MCI.

Authors	Population characteristics	Domains assessed	MCI definition	Prevalence PD-MCI	Cognitive profile found
Aarsland et al., 2009 [67]	Community-based incidental cohort, 196 nondemented, drug-naïve PD patients	Verbal memory Visuospatial ability Attention, executive function	≥1.5 SD below z score in at least 1 of 3 domains	18.9%	86.5% SD-MCI  62.2% Nonamnestic  24.3% Amnestic 13.5% MD-MCI  2.7% Nonamnestic  10.8% Amnestic
Foltynie et al., 2004 [32]	Incident cohort of 142 PD patients	Executive function Spatial memory Pattern recognition memory	≥1 SD below normative data in ≥1 test	35.2%	58% SD-MCI  34% Frontostriatal deficits  24% Temporal lobe deficits 42% MD-MCI (frontostriatal and temporal deficits)
Mamikonyan et al., 2009 [19]	106 PD patients, convenience sample with intact global cognition based on age- and education-adjusted MMSE score	Memory Executive function Attention	≥1.5 SD below normative data in ≥1 domain	29.2%	61.3% SD-MCI  29% Attention  19.3% Amnestic  13% Executive 38.7% MD-MCI
Muslimović et al., 2005 [20]	115 newly diagnosed PD patients without “global cognitive deterioration” defined as an MMSE score <24	Executive function Memory Attention Language Visuospatial	≥2 SD below normative data on ≥3 neuropsychological tests	23.5%	MCI subtypes not described

SD-MCI: single-domain mild cognitive impairment. MD-MCI: multiple-domain mild cognitive impairment.