Table 1.
Characteristics of the cases and controls.
| IIH | GP controls | Obese controls | |
|---|---|---|---|
| Participants n | 902 | 4510 | 4510 |
| Age at diagnosis/index date (years): | |||
| Mean (SE) | 32.2 (0.17) | 32.2 (0.17) | 32.2 (0.17) |
| Median (IQR) | 29 (23–38) | 29 (23–38) | 29 (23–38) |
| Female n (%) | 767 (85.0) | 3835 (85.0) | 3835 (85.0) |
| Mean age (SE) | 31.5 (0.11) | 31.5 (0.11) | 31.5 (0.11) |
| Median age (years) (IQR) | 29 (23–38) | 29 (23–38) | 29 (23–38) |
| Male n (%) | 135 (15.0) | 675 (15.0) | 675 (15.0) |
| Mean age (SE) | 36.2 (0.35) | 36.2 (0.35) | 36.2 (0.35) |
| Median age (years) (IQR) | 33 (24–47) | 33 (24–47) | 33 (24–47) |
| Information on achieved highest educational level n (%) | 887 (98.3) | 4454 (98.8) | 4453 (98.7) |
| Compulsory school (≤9 years) | 163 (18.4%) | 439 (9.9%) | 766 (17.2%) |
| Upper secondary (high school) | 447 (50.4%) | 1853 (41.6%) | 2408 (54.1%) |
| University (level above high school) | 277 (31.2%) | 2162 (48.5%) | 1279 (28.7%) |