Table 4.
The OR of MS according to level of self-education and parental educationa in a large registry-based sibling study in Norway.
| Low parental education |
High parental education |
|||
|---|---|---|---|---|
| No. of cases/controls | OR (95% CI)b | No. of cases/controls | OR (95% CI)b | |
| Level of education | ||||
| Primary | 924/1959 | Ref. | 44/103 | Ref. |
| Secondary | 1926/3968 | 0.94 (0.84–1.06) | 237/424 | 1.50 (0.98–2.31) |
| Undergraduate | 741/1513 | 0.80 (0.69–0.93) | 303/542 | 1.28 (0.82–1.98) |
| Graduate | 125/316 | 0.65 (0.50–0.84) | 129/276 | 1.29 (0.79–2.09) |
| p trend | <0.001 | 0.94 | ||
MS: multiple sclerosis; OR: odds ratio; CI: confidence interval.
a
Defined as at least one parent with undergraduate or graduate level of education.
b
Effect estimates calculated using conditional logistic regression comparing level of education in patients with the level of their own siblings. All estimates are adjusted for age, sex and number of siblings.