Table 1.

Patient and eye characteristics of optic nerve sheath fenestrations (ONSF). Age, weight, and height are represented as mean (standard deviation). Continuous variables are presented as mean (standard deviation). Categorical variables are presented as N (percentage). Percentages in the overall column are as a column percentage of the total (vertical). Percentages in the subgroups are as a row percentage of the overall (horizontal).

Aetiology	Overall	IIH	CVST	Other
Characteristics
Eyes
Total – eyes	116	92 (79.3%)	9 (7.7%)	15 (12.9%)
Gender
Male	16 (13.8%)	5 (31.3%)	1 (0.6%)	10 (62.5%)
Female	100 (86.2%)	87 (87%)	8 (8%)	5 (5%)
Age (years)	29.8 (11.1)	29.9 (10.7)	25.8 (4.2)	39 (15.7)
Type of ONSF
Bilateral	46 (79.3%)	37 (80.4%)	4 (8.7%)	5 (10.9%)
Unilateral	24 (20.7%)	18 (75%)	1 (4.2%)	5 (20.8%)
Pre-operative measurements (days prior) Follow-up (days)	7.6 (12.2)	7.6 (10.7)	8.4 (15.2)	2.3 (1.2)
Mean	324.7 (421.7)	373 (454.5)	213 (154.8)	77 (57.5)
Min	1	1	17	3
Max	2399	2399	412	193
Patients
Total	70	55 (78.6%)	5 (7.1%)	10 (14.3%)
Gender
Male	13 (18.6%)	5 (38.5%)	1 (7.7%)	7 (53.8%)
Female	57 (81.4%)	50 (87.7%)	4 (7.0%)	3 (5.3%)
Age (years)	30.9 (11.8)	29.9 (10.7)	25.8 (4.2)	39.0 (15.7)
Weight (kg)	94.5 (26)	95.2 (27.4)	85.3 (21.6)	93.4 (9.7)
Height (cm)	170 (10)	163 (11)	168 (7)	172 (9)
Diabetes	3 (4.3%)	2 (66.6%)	0	1 (33.3%)
Hypertension	6 (8.6%)	4 (66.6%)	1 (16.7%)	1 (16.7%)
Smoking	11 (15.7%)	10 (90.9%)	1 (9.1%)	0
Oral contraceptive	8 (11.4%)	5 (62.5%)	3 (37.5%)	0
Anti-depressant	9 (12.9%)	7 (77.8%)	0	2 (22.2%)
Treatment prior
Acetazolamide	53 (75.7%)	46 (86.8%)	4 (7.5%)	3 (5.7%)
Topiramate	8 (11.4%)	7 (87.5%)	1 (12.5%)	0
Corticosteroids	9 (12.9%)	4 (44.4%)	4 (44.4%)	1 (11.1%)
CSF diversion	6 (8.6%)	5 (83.3%)	0	1 (16.7%)

cm, centimetre; CVST, cerebral venous sinus thrombosis; IIH, idiopathic intracranial hypertension; kg, kilograms.