Case no WS Age at onset (months) Age at onset of ACTH (months) Treatment delay cHPI (/min) or SS on previous EEG if present SS on our initial EEG at onset of ACTH Relapse of spasms Post-treatment HPI Post-treatment SS Cognitive outcome at final visit Age at final visit (months)
type (months) dHPI (%) at onset of ACTH
C1: Cryptogenic cases with age at onset >3 months
1 C 5.5 7.5 2 10/min (30%) - Yes No <3/min Yes None 144
2 C 6 8 2 8/min (24%) - Yes No <3/min Yes None 54
3 C 6 8 2 9/min (27%) - Yes No <3/min Yes None 54
4 C 7 12 5 21/min (65%) - Yes Yes 4-10.4/min Yes Mild 60
C2: Cryptogenic cases with age at onset <3 months
5 C 1.5 4 2.5 100% Yes No No <3/min No Marked 8
6 C 2 16 14 100% Yes No No <3/min No Severe 30
7 C 2 50 48 100% Yes No No <3/min No Severe 60
S1: Symptomatic severe perinatal hypoxic ischemic encephalopathy
8 S 9 10 1 100% Not reported No No <2/min No Severe 36
9 S 10 11 1 100% Not reported No No <2/min No Severe 39
S2: Agenesis of corpus callosum
10 S 2 54 52 100% Not reported No No <3/min No Severe 66
11 S 3 72 69 100% Not reported No No <3/min No Severe 84
S3a: Hypogenesis of corpus callosum with treatment delay > 1year
12 S 2.5 33.5 31 100% Not reported No No <3/min No Severe 57.5
13 S 5 38.5 33.5 100% Not reported No No <3/min No Severe 62.5
S3b: Hypogenesis of corpus callosum with  treatment delay < 1 year
14 S 2 9 7 60% Yes No Yes 20-Apr No Marked 45
15 S 8 16 8 100% Yes No Yes 26-Apr No Marked 64
16 S 7 18 11 100% Yes No No <3/min No Severe 66
Table 2: Patient profiles. WS-West Syndrome; ACTH-Adrenocorticotropic hormone; cHPI-countable Hypsarrhythmia Paroxysm Index; dHPIdurational Hypsarrhythmia Paroxysm Index; SS-Sleep Spindles; C-Cryptogenic; S-Symptomatic