Table 2.

Scales selected to determine construct validity of the p-RDA severity scale

Selected scales
Domain	For	Correlating scale	To be reported by
Communication	All children	Intelligibility in Context Scale: Dutch (ICS)15 5 = high intelligibility, 1 = low intelligibility	Parents or caregivers
	All children	Communication Function Classification System (CFCS)16	SLT
		1 = effective communication both verbal and non-verbal, 5 = seldom effective communication both verbal and non-verbal
	All children	Viking Speech Scale (VSS)17	Health professional
		1 = speech not affected, 4 = no understandable speech
	All children	Capacity Profile Voice and Speech (CAP)18	Rehabilitation specialist
		0 = understandable speech should be possible, 5 = no communication possible
Mobility	Children with central nervous system disease	Manual Ability Classification System (MACS)19	Occupational therapist
		1 = handles objects easily, 5 = does not handle objects
		Gross Motor Function Classification System (GMFCS)21	Pediatric physical therapist
		1 = climb stairs without limitations, 5 = wheelchair bounded
	Children with peripheral nervous system disease	Vignos and Brooke classification (V&B)20	Pediatric physical therapist
		Upper extremities: 1 = no limitations, 6 = no functional use of hands
		Lower extremities: 1 = climbing stairs without assistance, 10 = bed ridden
Self-care	All children	Functional Oral Intake Scale (FOIS)22	Parents or other caregivers
		7 = oral diet with no restriction, 1 = nothing by mouth