Table 4.

Intraocular pressure in the trabeculectomy and Ex-PRESS groups.

Time point	Trabeculectomy (mm Hg)	Ex-PRESS (mm Hg)	P value
Preoperatively	27.9 ± 10.7 (n = 32)	27.2 ± 8.5 (n = 32)	0.94
3 months	13.4 ± 3.8 (n = 32)	14.7 ± 6.0 (n = 32)	0.48
6 months	14.2 ± 4.4 (n = 31)	14.1 ± 3.8 (n = 32)	0.88
9 months	13.4 ± 3.9 (n = 30)	14.1 ± 4.0 (n = 31)	0.77
12 months	13.2 ± 3.7 (n = 29)	14.4 ± 3.6 (n = 30)	0.58
24 months	15.0 ± 4.4 (n = 25)	14.7 ± 2.2 (n = 28)	0.33

Mann–Whitney nonparametric test (data are mean values ± standard deviation).