Table 2.

Overall distribution of educational level among MS patients, their siblings and their parents in a large registry-based sibling study in Norway.

	Level of education
	Primary	Secondary	Undergraduate	Graduate	Missinga
Cases, %	22.3	48.6	23.3	5.7	0.2
Family
Siblings, %	22.5	47.4	22.1	6.4	1.6
Mothers, %	49.2	40.6	7.2	0.4	2.6
Fathers, %	40.5	42.5	8.0	4.4	4.6

MS: multiple sclerosis.

^aMissing values on level of education.