The effects of the first versus second glaucoma drainage implant surgery in patients with primary open-angle glaucoma

Table 2 Comparison of IOP and medication score before GDIS and at final visit, and reduction in the first GDI group and the second GDI group

IOP				Medication Score
	the first GDI group	the second GDI group	P-value		the first GDI group	the second GDI group	P-value
All Cases
No. of eyes	136	32		No. of eyes	131	32
IOP reduction range (mmHg) (mean ± SD)	9.1 ± 8.3	7.0 ± 5.2	0.39	The reduction range (mmHg) (mean ± SD)	0.8 ± 2.0	0.7 ± 2.0	0.55
IOP reduction rate (%) (mean ± SD)	31.3 ± 28.2	24.0 ± 23.5	0.66	The reduction rate (%) (mean ± SD)	11 ± 59	15 ± 47	1.00
Excluding TRAB Cases
No. of eyes	96	23		No. of eyes	96	23
IOP reduction range (mmHg) (mean ± SD)	8.2 ± 7.5	5.9 ± 5.2	0.30	The reduction range (mmHg) (mean ± SD)	0.7 ± 1.8	0.3 ± 2.0	0.18
IOP reduction rate (%) (mean ± SD)	29.3 ± 22.0	23.1 ± 23.5	0.35	The reduction rate (%) (mean ± SD)	10 ± 56	3 ± 44	0.37

Mann-Whitney U test
There was no significant difference of IOP reduction range/rates between the first GDI group and the second GDI group
There was no significant difference in the reduction range/rate of glaucoma medications between the first GDI group and the second GDI group
GDIS, glaucoma device implant surgery; IOP, intraocular pressure; SD, standard deviation; TRAB, trabeculectomy

ISSN: 1471-2415