Table 2.

Intraocular Pressure Changes Before and After 27-Gauge and 23-Gauge Vitrectomy

	Baseline	Postop Day 1	Postop Week 1	Final Visit	p valuea
27-gauge	14.1 ± 3.2	13.1 ± 2.7	14.5 ± 2.5	14.7 ± 2.8	0.075, 0.077, 0.082
23-gauge	14 ± 3	12 ± 5.6	13.9 ± 3.1	14.9 ± 2.4	0.035, 0.048, 0.109
p valueb	0.910	0.390	0.459	0.757

Notes: ^aThe three p values calculated by Student’s t-test are for comparisons of: mean IOP at baseline to that at first postoperative day, mean IOP at the first postoperative day to that at 1 week postoperatively, and mean IOP at 1 week postoperatively to that at the final visit, respectively. ^bp value calculated by Student’s t-test for comparing the mean IOP values in the 27-gauge to those in the 23-gauge groups at different time points.