Table 3.
The OR of MS according to level of education in a large registry-based sibling study in Norway.
| No. of cases/controls | OR (95% CI)a |
||
|---|---|---|---|
| Multivariate adjustedb | Multivariate adjustedc | ||
| Level of education | |||
| Primary | 1003/2104 | Ref. | Ref. |
| Secondary | 2186/4431 | 0.96 (0.87–1.07) | 0.96 (0.86–1.07) |
| Undergraduate | 1050/2063 | 0.82 (0.72–0.95) | 0.82 (0.72–0.95) |
| Graduate | 255/595 | 0.73 (0.59–0.90) | 0.73 (0.59–0.90) |
| p trend | <0.001 | <0.001 | |
MS: multiple sclerosis; OR: odds ratio; CI: confidence interval.
a
Effect estimates calculated using conditional logistic regression comparing level of education in patients with the level of their own siblings.
b
Adjusted for age, sex, parental education and number of siblings.
c
Further adjusted for birth order and residency at birth.