Table 2.

Table 2 Multivariate regression modeling: factors associated with onset age

Factors associated with juvenile onset: logistic regression
Factors	Odds ratio (95%CI)	χ²	p
Poor functional outcome	2.00 (1.34 to 2.95)	8.82	0.003
More family history	1.71 (1.20 to 2.43)	5.86	0.015
More episodes/year	1.08 (0.89 to 1.33)	0.63	0.43
Factors associated with onset in childhood vs. adolescence: logistic regression
Factors	Odds ratio (95%CI)	χ²	p
Poor functional outcome	2.70 (1.08 to 6.77)	4.51	0.03
More family history	4.65 (1.04 to 20.8)	4.04	0.04
More episodes/year	4.85 (1.05 to 22.4)	0.63	0.04
Factors associated with younger onset age: linear regression
Factors	β coefficient (95% CI)	1	p
More family history	2.78 (1.05 to 4.41)	3.35	0.001
Poor functional outcome	2.61 (1.01 to 4.21)	3.20	0.001
Episodes/year	0.62 (-1.90 to 1.43)	1.50	0.13