Table 2.

Studies Including Patients with PD

Ref.	Disease population	Country	Design	Control population	n, Cases/controls	SUA compared in cases/controls	Cog function related to SUA	Longitudinal follow-up
Ahlskog et al. (1995)	AD; PD	America	Case Control	Normal controls	71/15	Yes	No	No
Annanmaki et al. (2008)	PD	Finland	Cross Sectional	No	40/NA	No	Yes	No
Annanmaki et al. (2011)	PD	Finland	Cohort	Yes	28/12	Yes	Yes	Yes
Ascherio et al. (2009)	PD	America	Clinical Trial Analysis	No	774/NA	No	Yes	No
Foy et al. (1999)	AD; VD; PD with dementia	UK	Case Control	Age matched	134/41	Yes	No	No
González-Aramburu et al. (2014)	PD, CI	Spain	Case Control	PD, no CI	72/271	Yes	Yes	No
Maetzler et al. (2011)	Lewy-Body Disorders	Germany	Case Control	Healthy controls	171/76	Yes	Yes	No
Moccia et al. (2014)	PD	Italy	Cross Sectional	No	80/NA	No	Yes	No
Pan et al. (2013)	PD	China	Case Control	Age matched	160/80	No	Yes	No
Tohgi et al. (1993)	PD	Japan	Case Control	Age matched	26/14	Yes	Yes	No
Wang et al. (2009) Jun 16	PD, CI	China	Case Control	PD, no CI	54/54	Yes	Yes	No
You and Liu 2012	PD with depression or CI	China	Case Control	PD without depression or CI	29/26	Yes	No	No

AD Alzheimer’s disease, VD Vascular Dementia, PD Parkinson’s Disease, CI cognitive impairment, NA not applicable