Table 6.

Comparison of clinical parameters between patients with higher versus lower preoperative peak IOP (mean ± SD, µm).

	Preoperative peak IOP ≥ 37 mmHg (n = 30)	Preoperative peak IOP < 37 mmHg (n = 30)	p-value
IOP parameters (mmHg)
Preoperative peak IOP	46.7 ± 5.9	28.0 ± 4.9	<0.001
Postoperative mean IOP	14.8 ± 3.4	14.7 ± 3.8	0.860
IOP reduction	31.9 ± 6.8	13.3 ± 7.0	<0.001
p-value	<0.001	<0.001
Average RNFL thickness (µm)
Preoperative	81.0 ± 18.7	70.1 ± 15.0	0.016
Postoperative	71.4 ± 16.5	69.0 ± 15.2	0.560
Change	9.7 ± 6.6	1.1 ± 3.8	<0.001
p-value	<0.001	0.113
Average GCIPL thickness (µm)
Preoperative	70.1 ± 15.4	65.9 ± 12.7	0.246
Postoperative	67.6 ± 12.6	65.8 ± 12.8	0.591
Change	2.4 ± 5.8	0.2 ± 4.8	0.113
p-value	0.030	0.813
Mean deviation (dB)
Preoperative	−18.1 ± 9.9	−20.5 ± 10.6	0.303
Postoperative	−17.3 ± 8.9	−20.0 ± 11.5	0.338
Change	−0.8 ± 3.2	−0.5 ± 3.4	0.512
p-value	0.625	0.733
Visual field index (%)
Preoperative	55.4 ± 28.9	53.2 ± 32.7	0.437
Postoperative	55.3 ± 28.7	53.9 ± 36.1	0.301
Change	0.1 ± 9.2	−0.7 ± 10.0	0.101
p-value	0.907	0.495

SD = standard deviation, IOP = intraocular pressure, RNFL = retinal nerve fibre layer, GCIPL = ganglion cell layer plus inner plexiform layer.