Study	Country	Year	Sample	Type	Severity	Age (y)
Arai	Japan	2014	16	Bil spastic	III–IV+	4–9
Bar-haim	Israel	2010	72	Spastic/Diplegia, Quadriplegia	II–III	8.8
Bower	UK	1996	44	Quadriplegic	Non-specific	3–11
Bryant	UK	2013	35	Dyskinetic/spastic	IV–V	13.75
Choi	Korea	2011	10	Non-specific	Non-specific	2–9
Christiansen	Denmark	2008	24	Non-specific	I–IV	3.167
Grecco	Brazil	2013	33	Non-specific	I–III	3–12
Labaf	Iran	2015	28	Diplegic	Non-specific	2–6
Reddihough	Australia	1998	22	Non-specific	Non-specific	1–3
Scholtes	Netherland	2010	48	Spastic	I–III	6–13.8
Shamsoddini	Iran	2009	24	Spastic/Diplegic	Non-specific	2–6
Shamsoddini	Iran	2010	22	Spastic/Diplegic/Hemiplegic	Non-specific	2–6
Tsorlakis	Greece	2004	34	Hemiplegia/Diplegia/	I–III	3–14
				Quadriplegia