Table 3.

Subtypes of Phase II participants stratified by surgical history

		shunt for hydro-cephalus		tethered cord release		shunt for syringomelia		clubfoot or ankle surgery		Hip or knee contracture release		hip osteotomy
		n	% of subtype	n	% of subtype	n	% of subtype	n	% of subtype	n	% of subtype	n	% of subtype
Myelomeningocele	history of	279	86.4	107	33.1	10	3.1	113	35.0	76	23.5	14	4.3
	no history of	44	13.6	216	66.9	313	96.9	210	65.0	247	76.5	309	95.7
Non-myelomeningocele	history of	4	7.0	35	61.4	4	7.0	13	22.8	7	12.3	1	1.8
	no history of	53	93.0	22	38.6	53	93.0	44	77.2	50	87.7	56	98.2