Characteristics of reports included in the systematic review
| Author (year) (reference number) | PD total | n (%) PD with dementia | Definition of dementia | Comparison groups | |
| Aarsland et al (2005)18 | 22 | 18 (81.2%) | DSM-III-R | None | |
| Apaydin et al. (2002)19 | 22 | 13 (59.1%) | DSM-III-R | None | |
| Ballard et al (2006)20 | 28 | 28 (100%) | DSM-III-R | DLB | |
| Bancher et al (1993)a, b 21 | 28 | 12 (42.9%) | MMSE <17 | None | |
| Braak and Braak (1990)22 | 11 | 10 (90.9%) | Clinical | Controls, AD, trisomy 21 | |
| Braak et al (2005)23 | 88 | 79 (89.8%) | MMSE <21 | None | |
| Churchyard and Lees (1997)24 | 27 | 17 (63.0%) | DSM-III | Controls | |
| Colosimo et al (2003)25 | 38 | 21 (55.3%) | DSM-III-R | None | |
| Compta et al (2011)c 26 | 56 | 29 (51.8%) | DSM-IV | None | |
| de la Monte et al (1989)27 | 10 | 4 (40.0%) | Clinical | Controls and AD | |
| de Vos et al (1995)28 | 18 | 12 (66.7%) | DSM-III-R / MMSE <20 | Controls | |
| Fujishiro et al (2010)29 | 13 | 13 (100%) | Clinical | DLB | |
| Gaspar and Gray (1984)30 | 32 | 18 (56.3%) | Clinical | Controls | |
| Halliday et al (2011)31 | 19 | 12 (63.2%) | Clinical | Controls and DLB | |
| Harding and Halliday (2001)32 | 41 | 16 (39.0%) | CDR >0.5 | DLB | |
| Horvath et al (2013)33 | 155 | 109 (70.3%) | Clinical | None | |
| Howlett et al (2015)d 34 | 34 | 34 (100%) | Clinical | DLB | |
| Hughes et al (1993)35 | 100 | 31 (31.0%) | DSM-III / MMSE <20 | None | |
| Hurtig et al (2000)36 | 42 | 22 (52.4%) | DSM-IV | None | |
| Irwin et al (2012)37 | 140 | 92 (65.7%) | DSM-IV | None | |
| Jellinger et al (1991)a, b 38 | 26 | 9 (34.6%) | MMSE <17 | Controls | |
| Jellinger et al (2002)39 | 200 | 66 (33.3%) | MMSE <20 | None | |
| Jellinger and Attems (2006)40 | 17 | 17 (100%) | Clinical | DLB | |
| Jellinger and Attems (2008)41 | 68 | 32 (47.1%) | MMSE <20 | DLB | |
| Jendroska et al (1996)42 | 50 | 23 (46.0%) | DSM-III-R | Controls | |
| Kalaitzakis et al (2009)43 | 32 | 12 (37.5%) | DSM-IV / ICD-10 | DLB | |
| Kalaitzakis et al (2011)44 | 93 | 41 (44.1%) | DSM-IV / ICD-10 | Controls, DLB, MSA, PSP | |
| Kempster et al (2010)c 45 | 129 | 69 (53.5%) | DSM-IV | None | |
| Kotzbauer et al (2012)46 | 32 | 32 (100%) | Clinical | None | |
| Kövari et al (2003)47 | 22 | 10 (45.5%) | CDR >0.5 | None | |
| Libow et al (2009)48 | 18 | 18 (100%) | DSM-IV | None | |
| Mattila et al (1998)e 49 | 44 | 35 (79.5%) | GDS >1 | None | |
| Mattila et al (1999)e 50 | 45 | 35 (77.8%) | GDS >1 | None | |
| Mattila et al (2000)e 51 | 45 | 35 (77.8%) | GDS >1 | None | |
| Nakashima-Yasuda et al (2007)52 | 90 | 21 (23.3%) | Clinical | Controls and DLB | |
| Perry et al (1985)53 | 11 | 7 (63.6%) | Clinical | Controls and AD | |
| Ruffmann et al (2016)54 | 104 | 55 (52.9%) | DSM-IV / MDS | DLB | |
| Sabbagh et al (2009)55 | 51 | 51 (100%) | DSM-IV | None | |
| Sierra et al (2016)56 | 20 | 10 (50%) | MDS | Controls, AD, DLB | |
| Tsuboi et al (2007)57 | 7 | 7 (100%) | Clinical | DLB | |
| Vermersch et al (1993)58 | 24 | 16 (66.6%) | Clinical | Controls and AD | |
| Walker et al (2015)d 59 | 3 | 3 (100%) | MDS | AD and DLB | |
| Whitehouse et al (1983)60 | 9 | 5 (55.6%) | Clinical | Controls and PEP | |
| Wills et al (2010)f 61 | 35 18 | 18 (51.4%) 7 (38.9%) | Clinical | Controls |
a These reports were based on the same cases.
b There was potential overlap between these cases.
c There was potential overlap between these cases.
d There was potential overlap between these cases.
e These reports were based on the same cases.
f This study obtained striata from 35 cases and inferior frontal gyri from 18.
AD, Alzheimer’s disease; CDR, clinical dementia rating; DLB, dementia with Lewy bodies; DSM, Diagnostic and Statistical Manual of Mental Disorders; GDS, Global Deterioration Scale; ICD, International Classification of Diseases; MDS, Movement Disorder Society; MMSE, Mini-Mental State Examination; MSA, multiple system atrophy; PD, Parkinson’s disease; PEP, post-encephalitic parkinsonism; PSP, progressive supranuclear palsy.