Table 1.

Descriptive information for dogs with idiopathic or structural epilepsy

	Idiopathic		Structural
	N	%	N	%
Status at study end
Alive	45	74	4	31
Deceased	16	26	9	15
Gender
Female	27	44	10	77
Entire	21	78	9	90
Neutered	6	22	1	10
Male	34	56	3	23
Entire	24	71	2	67
Neutered	10	29	1	33
Seizure type
Focal	12	20	1	8
Focal evolving into generalized	34	56	9	69
Primary generalized	11	18	2	15
Unknown	4	7	1	8
Diagnostic work-up
Magnetic resonance imaging	30	49	9	69
Computed tomography	0	0	4	31
Cerebrospinal fluid analysis	20	33	6	46
Post mortem histopathology	1	2	6	46
Seizure severity
Cluster seizures (prior to inclusion)	18	30	12	92
Status epilepticus (prior to inclusion)	2	3	0	0
Median age at seizure onset (months)a	35 (range: 5–114)		59 (range 3–144)
Median age at inclusion (months)	43 (range: 13–119)		48 (range: 3–146)
Median months of inclusion	28 (range: 1–42)		1 (range: 0–38)
Median weight at inclusion (kg)b	23.9 (range: 2–71)		8.9 (range: 2.2–32)
Survival
Survival time (months)	23 (range: 3–65)		2 (range: 0–49)

^aSeven dogs with idiopathic epilepsy and two dogs with structural epilepsy excluded, as exact date of onset was unknown

^bThree dogs with idiopathic epilepsy excluded from calculation, as weight at onset was unknown