Table 1

Summary of the 400 patients analysed

	Cases	Cases with mutation	Percentage with mutation (%)
All cases	400	71	18
Male	192	41	21
Female	208	29	14
Seizures	323	60	19
Seizure onset <2 years	222	31	14
Seizure onset <2 months	77	30	39
Developmental delay, no seizures	77	11	14