Table 1 Studies examining the prevalence of the LRRK2 G2019S mutation in idiopathic PD cohorts.

Reference		Case recruitment base		Ethnicity		PD cases																		Controls
						Overall						Familial						Sporadic
						n		Carr		Freq (%)		n		Carr		Freq (%)		n		Carr		Freq (%)		n		Carr
Aasly5		Outpatient clinic		Norwegian		435		9		2.1		65		6		9.2		370		3		0.8		519		0
Berg6		N/A		N/A		390		1		0.3		53		0		<1.8		337		1		0.3		1200		0
Bras7		Outpatient clinic		Portugese		124		7		5.6		22		2		9.1		102		5		4.9		126		0
Deng8		N/A		North American		326		4		1.2		150		3		2.0		176		1		0.6		130		0
Farrer9		Tertiary referral clinic		North American		786		4		0.5		236		4		1.7		550		0		<0.2		278		0
Gilks10		Tertiary referral clinic		White British		482		8		1.7		N/A		3		N/A		N/A		5		N/A		345		0
Hernandez11		N/A		Whiite North American		719		7		1.0		N/A		1		N/A		N/A		6		N/A		2680		0
Kay12		Tertiary referral clinic		North American (95% white)		1425		18		1.3		329		10		1.9		1096		8		0.7		1647		1
Zabetian13		Outpatient/research clinic		North American (93% European)		371		3		0.8		74		1		1.4		297		2		0.7		281		0
Tan17		Tertiary referral clinic		Asian†		675		0		<0.1		58		0		<1.7		617		0		<0.2		325		0
Skipper18		Tertiary referral clinic		Asian‡		630		0		<0.1		160*		0		<0.6		470		0		<0.2		630		0
Bialecka19		Outpatient clinic		Polish		174		0		<0.5		21		0		<4.7		153		0		<0.7		190		0
This study		Community/research clinic		White British		519		2		0.4		74		1		1.4		445		1		0.2		887		0

*Non‐dominant family history; †88% Chinese, 7% Malay, 5% Indian; ‡84% Chinese, 8% Malay, 2% mixed Asian; Carr, carriers; Freq, frequency; N/A, not applicable.