TABLE 1 .

Demographic and pre-operative information for patients undergoing ONSF for IIH (n = 37).

	Mean ± standard deviation	Range
Age (years)	33 ± 11	19–74
Gender	5/37 (13%) male
Post-operative follow-up (weeks)	210 ± 200	4–700
Unilateral/bilateral	24 unilateral, 13 bilateral
Subsequent CSF diversion procedures	8 (4 after second eye ONSF)
Time to surgery (weeks)	36 ± 54	0.5–226
Time to second procedure (weeks)	6 ± 7
Clinical recurrence	12/37 (32%)
Time to clinical recurrence (weeks)	55 ± 56	5–375
Pre-operative steroids	10/37 (27%)
Presenting symptoms	Headache: 35/37 (95%)
	Pulsatile tinnitus 18/37 (49%)
	Transient visual obscuration 17/37 (46%)
	Diplopia 2/37 (5%)
Pre-operative risk factors for IIH	Obesity 36/37 (97%)
	Tetracycline 3/37 (8%)
	Obstructive sleep apnea 2/37 (5%)
	Oral contraceptive use 2/37 (5%)