Table 4.

SD standard deviation, IOP intraocular pressure, SLT selective laser trabeculoplasty. Significance of within treatment change, **p < 0.001, *p < 0.01. p-values in the right hand column reflect comparisons for baseline and treated IOP between SLT1 (<12 months in between treatments) and SLT1 (≥12 months between treatments, and SLT2 (<12 months in between treatments) and SLT2 (≥12 months between treatments)

		Interval between SLT1 and SLT2 ≥ 12 months			Interval between SLT1 and SLT2 < 12 months
		SLT1 Mean (sd)	SLT2 Mean (sd)	p SLT1 vs SLT2	SLT1 Mean (sd)	SLT2 Mean (sd)	p SLT1 vs SLT2	p-value
IOP	Baseline (n = 104,33)	20.0 (5.3)	18.8 (4.9)	0.02	21.3 (4.8)	21.1 (5.0)	0.84	0.22 0.02
	6–12 months (n = 102,92,28,27)	15.3 (3.3)	16.4 (4.8)	0.03	20.0 (5.4)	16.2 (5.1)	0.004	<0.001 0.82
	12–15 months (n = 97,80,13, 19)	16.3 (4.0)	16.9 (4.8)	0.19	19.3 (1.2)	16.1 (4.6)	0.58	0.19 0.50
IOP decrease	6–12 months	4.7 (4.6)**	2.4 (4.3)**	<0.001	1.9 (5.0)	4.8 (5.6)**	0.11	0.007 0.02
IOP decrease	12–15 months	3.6 (4.7)**	1.7 (4.1)**	0.004	0.3 (2.5)	4.2 (5.5)*	0.73	0.24 0.03
IOP % reduction	6–12 months	20.5 (18.5)**	12.4 (24.0)**	0.02	7.6 (21.2)	22.5 (23.7)**	0.05	0.002 0.07
IOP % reduction	12–15 months	15.0 (23.5)**	8.9 (20.9)**	0.09	0.2 (12.8)	19.4 (25.8)*	0.66	0.28 0.06