Table 1: Patient demographics

Age (years)		69.7 ± 15.9 (17.0-101)
Follow-up time (months)		6.0 ± 7.6 (1-30)
		n		Percent
Sex
Male		143		49.1
Female		148		50.9
Race
White		251		86.3
African-American		23		7.9
Asian		3		1.0
Hispanic		14		4.8
Diagnosis
POAG		197		67.7
NVG		26		8.9
Uveitic		26		8.9
UGH		4		1.4
Traumatic		9		3.1
Congenital		5		1.7
CACG		10		3.4
PSX		6		2.1
Other OAG		6		2.1
Pigmentary		3		1.0
Steroid induced		1		0.3
ICE syndrome		2		0.7
NTG		2		0.7
Previous tube surgery
Yes		10		3.4
No		281		96.6
Previous trabeculectomy
Yes		82		28.2
No		209		71.8
Other previous surgery
Yes		239		82.1
No		52		17.9

Patient Demographics. POAG: Primary open angle glaucoma; NVG: Neovascular glaucoma; UGH: Uveitis-glaucoma hyphema syndrome; CACG: Chronic angle closure glaucoma; PSX: Pseudoexfoliation glaucoma; OAG: Open angle glaucoma; ICE Syndrome: Iridocorneal endothelial syndrome; NTG: Normal tension glaucoma