TABLE 3.

Sensitivity analysis

	Multivariate analysis adjusted for age and epilepsy duration (N = 682)	Intellectual disability imputed at ‘no’ when missing a (n = 682)	Complete data and intellectual disability imputed at ‘no’ when missing a (n = 590, 48 cases and 542 controls)
	OR (95% CI)	OR (95% CI)	OR (95% CI)
Generalized seizure frequency
Less than 1 per year	1 (ref)	1 (ref)	1 (ref)
Between 1 per year and 1 per month	2.22 (1.02–4.79)	2.15 (0.95–4.86)	2.21 (0.92–5.34)
More than 1 per month	3.38 (1.35–8.48)	3.25 (1.32–8)	3.77 (1.4–10.17)
Intellectual disability	1.9 (0.81–4.46)	3.81 (1.67–8.69)	5.57 (2.18–14.22)
Current or past depression	2.29 (1.18–4.46)	2.37 (1.27–4.41)	3.04 (1.46–6.31)
Respiratory symptoms during or after seizure	1.93 (0.98–3.82)	1.91 (0.96–3.81)	1.91 (0.88–4.17)
Nocturnal seizure	6.41 (3.33–12.35)	6.85 (3.57–13.16)	9.67 (4.34–21.54)
Able to alert someone of an oncoming seizure	0.47 (0.24–0.91)	0.5 (0.26–0.98)	0.55 (0.26–1.19)
Seizure‐related falls	2 (1.03–3.91)	2.04 (1.06–3.94)	1.96 (0.91–4.21)

Abbreviations: CI, confidence interval; OR, odds ratio.

^a Adjusted for age and epilepsy duration.