Table 1.

Summary of studies published since 2000 examining the prevalence of epilepsy in ASD populations (total samples and special populations within sample such as those with and without intellectual disability (ID) or gender) including sample characteristics (samples size, age, ascertainment methods, diagnoses, whether the samples includes non-idiopathic autism).

Sample size	Age	Ascertainment	Diagnosis	Sample Includes non-idiopathic	Epilepsy rate in total sample and sample subgroups	Reference
2112	n/a	Mixed	Autism, PDD	yes	With intellectual disability: 21.4 % Without intellectual disability: 8% Male: 18.5% Female: 34.5%	(22)
46	Mean 7.8 yrs	Clinic based	Autism, PDD	no	Total sample: 13%	(28)
108	Mean 25.5 yrs	Population Based	Autistic or “Autistic Like”	yes	Total sample: 38%	(10)
56	Range 1-14 yrs	Clinic based	Autism, PDD, Asperger's	yes	Total sample: 28% Autism: 40.0% PDD: 11.1%	(38)
104	Range 30mo. -8 yrs	Clinic based	Autism or ASD	yes	Total sample: 19.4%	(33)
60	Mean 17.6 yrs Range 12-30 yrs	Clinic based	Autism	no	Total sample: 38.3% (includes febrile seizures)	(30)
130	Range 18-35 yrs	Clinic based	Autism, PDD	no	Total sample: 17% (25% when 1 seizure included)	(11)
77	Mean 9.1 yrs	Clinic based	Autism, PDD, Asperger's, CDD	no	Total sample: 22.1%	(21)
59	Range 0.5-21 yrs	Clinic based	Autism	yes	Total sample: 46%	(6)
32	Mean 5 yrs	Clinic based	Autism	no	Total sample 36%	(14)
77	Mean 17 yrs	Clinic based	Autism, PDD	yes	Autism: 20.8% PDD: 35.1%	(12)
72	Mean = 9 yrs Range = 4-21 yrs	Clinic based	Autism	yes	7% Idiopathic 55% Non-idiopathic	(18)
233	Range 1-56 yrs	Clinic based	Autism, Asperger's	yes	17% “essential” 39% “complex”	(2)