Table 3.

Baseline data and outcomes of success at 6 and 12 months after pars plana vitrectomy

	Trab group	nonTrab group	P-value
Preoperative
IOP (mmHg)	25.0 ± 9.3	38.8 ± 21.0	0.135‡
Number of IOP-lowering medication	2.0 ± 1.3	3.0 ± 1.3	0.130‡
Number of patients with medication (%)	9 (100.0)	6 (100.0)
At 6 months
Number of patients (%)	5 (55.6)	3 (50.0)
IOP (mmHg)	18.0 ± 7.8	18.0 ± 5.6	0.732‡
Qualified success [n (%)]
≤ 21 mmHg + 20% IOP ↓	3 (60.0)	2 (66.7)	1.000†
< 18 mmHg	3 (60.0)	1 (33.3)	0.604†
Number of IOP-lowering medication	3.3 ± 1.5	3.5 ± 2.1	1.000‡
Number of patients with medication (%)	3 (60.0)	2 (66.7)
Complete success [n (%)]
≤ 21 mmHg + 20% IOP ↓	2 (40.0)	1 (33.3)	1.000†
< 18 mmHg	2 (40.0)	0 (0.0)	0.486†
At 12 months
Number of patients (%)	5 (55.6)	2 (33.3)
IOP (mmHg)	20.0 ± 3.9	20.3 ± 3.3	0.571†
Qualified success [n (%)]
≤ 21 mmHg + 20% IOP ↓	2 (40.0)	0 (0)	0.486†
< 18 mmHg	2 (40.0)	0 (0)	0.486†
Number of IOP-lowering medication	2.8 ± 1.3	4.0 ± 2.8	0.800‡
Number of patients with medication (%)	4 (80.0)	2 (100.0)
Complete success [n (%)]
≤ 21 mmHg + 20% IOP ↓	1 (20.0)	0 (0)	1.000†
< 18 mmHg	1 (20.0)	0 (0)	1.000†

Notes:

^†Pearson’s chi-squared test (Fisher’s exact test);

^‡Mann-Whitney U test; values are means ± standard deviation unless otherwise stated.

Abbreviations: IOP, intraocular pressure; Trab, trabeculectomy.