Table 1. Clinical severity score scale.

Severity Score (SS)	0	1	2	3
Seizures	Absent	Easily managed with meds	Managed with meds but occasional breakthrough	Recalcitrant seizures multiple meds
Gait	Normal	Mildly apraxic	Requires support for walking	Requires support to stand; wheelchair bound
Scoliosis	Absent	<20 degree	20–30 degrees	>30 degree, requires surgery
Respiratory Irregularity	Absent	Minimal BH	BH and HV > half the wake period	BH and HV > half wake period, ± cyanosis
Hand Use	Normal	Purposeful grasping	Tapping for needs	No hand use
Speech	Normal	Sentences/phrases	Single words	Non-verbal
Sleep	Normal	Awakens but falls back to sleep	Fragmented night sleep with daytime sleepiness	Unable to sleep through the night

BH = breath holding; HV = hyperventilation