Table 3.

Demographics.

	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)
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%)

GP = General population, n=number, SE = Standard Error, IQR= interquartile range.