Table 1.

Intraocular Pressure and Medical Therapy at Baseline and Follow-up in the Ahmed Baerveldt Comparison Study^*

	Ahmed Group	Baerveldt Group	P-value†
Baseline
IOP (mm Hg)	31.2 ± 11.2	31.8 ± 12.5	.71
Glaucoma medications	3.4 ± 1.1	3.5 ± 1.1	.34
N	143	133
1 month
IOP (mm Hg)	20.7 ± 9.7	18.0 ± 10.0	0 .026
Glaucoma medications	0.5 ± 1.1	1.3 ± 1.5	< 0.001
N followed (% of baseline)	141 (99%)	131 (98%)
3 months
IOP (mm Hg)	18.8 ± 8.2	16.7 ± 8.2	0.044
Glaucoma medications	1.4 ± 1.3	1.2 ± 1.3	0.28
N followed (% of baseline)	134 (94%)	125 (94%)
6 months
IOP (mm Hg)	15.7 ± 5.3	14.8 ± 6.8	0.27
Glaucoma medications	1.7 ± 1.4	1.3 ± 1.3	0.010
N followed (% of baseline)	131 (92%)	125 (94%)
1 year
IOP (mm Hg)	15.4 ± 5.5	13.4 ± 6.9	0.018
Glaucoma medications	1.8 ± 1.3	1.5 ± 1.4	0.078
N followed (% of baseline)	133 (93%)	117(88%)
18 months
IOP (mm Hg)	14.8 ± 4.6	13.3 ± 4.6	0.034
Glaucoma medications	1.8 ± 1.4	1.4 ± 1.4	0.068
N followed (% of baseline)	121 (85%)	106 (80%)
2 years
IOP (mm Hg)	14.5 ± 5.5	14.2 ± 6.0	0.76
Glaucoma medications	1.9 ± 1.3	1.4 ± 1.5	0.020
N followed (% of baseline)	122 (85%)	110 (83%)
3 years
IOP (mm Hg)	14.3 ± 4.7	13.1 ± 4.5	0.086
Glaucoma medications	2.0 ± 1.4	1.5 ± 1.4	0.020
N followed (% of baseline)	106 (74%)	100 (75%)

Data are presented as mean ± standard deviation (SD).

IOP = intraocular pressure

^*IOP, number of medications censored after treatment failure by no light perception (NLP), reoperation for glaucoma, explantation for complication

^†Student t-test