4. Participant characteristics in included studies.

Study ID	Age range (mean)	Distribution of spasticity	Severity	M:F	Co‐morbidities
Albright 1991	5 to 27 years (12.2 years)	17/17 quadriplegia	'moderate'	11:6	ND
Armstrong 1997	4 to 16 years (8.9 years)	10/10 quadriplegia	'severe'	ND	ND
Gilmartin 2000	4 to 31 years (10.3 years)	35/51 quadriplegia, 12/51 diplegia; 4/51 paraplegia	severe ‐ Ashworth score >= 3	29:22	ND
Hoving 2006/Hoving 2007	7 to 16 years (13 years)	14/17 quadriplegia; 3/17 diplegia	GMFCS 3 ‐ 1; GMFCS 4 ‐ 2; GMFCS 5 ‐ 13	8:8	ND
Hoving 2009a	as above	as above	as above	as above	ND

F: female
 GMFCS: Gross Motor Function Classification System
 M: male