Table 2.

Demographic characteristics of the participants.

Study	Country	Gender	Age (SD)	Disease Duration	Disease Classification
Pazzaglia et al. (30)	Italy	Female = 16	71 (8.5)	6 (± 6.29)	UPDRS III 24
		Male = 35
Pavez-adasme et al. (36)	Chile	Female = 3	66.6 (8.1)	4.5 (± 2.6)	H&Y 1–3
		Male = 5
Tollar et al. (41)	The Netherlands	Female = 38	69.3 (4.35)	7.4 (± 2.04)	H&Y 2–3
		Male = 36
Santos et al. (37)	Brazil	Female = 14	64.2 (8.5)	7.1 (± 0.5)	H&Y 1–3
		Male = 31
Feng et al. (34)	China	Female = 12	67.1 (4.71)	6.8 (± 1.44)	H&Y 2–4
		Male = 16
Allen et al. (35)	Australia	Female = 15	67.9 (7.9)	5.6 (± 5)	UPDRS III 40
		Male = 23
Fontoura et al. (33)	Brazil	Female = 4	63 (7)	n/g	H&Y 1–3
		Male = 16
Gandolfi et al. (32)	Italy	Female = 25	68.6 (8.2)	6.8 (± 3.85)	H&Y 2.5–3
		Male = 51
Yang et al. (40)	Taiwan	Female = 9	75.2 (7.35)	10 (± 3.85)	H&Y 2–3
		Male = 14
Shih et al. (39)	Taiwan	Female = 4	68.1 (9.81)	4.6 (± 4.29)	H&Y 1–2
		Male = 18
Liao et al. (31)	Taiwan	Female = 19	65.6 (7.46)	7 (± 2.83)	H&Y 1–3
		Male = 17
Shen and Mak (38)	China	Female = 24	64.3 (8.25)	7.3 (± 4.15)	H&Y 1–3
		Male = 27
Pedreira et al. (29)	Brazil	Female = 9	63.65 (8.25)	7.9 (± 5.6)	H&Y 1–2.5
		Male = 22
Pompeu et al. (28)	Brazil	Female = 15	67.4 (8.1)	n/g	H&Y 1–2
		Male = 17