Table 3.

Fitted slopes of retinal nerve fibre layer thickness and visual field threshold above and below the tipping point. All slopes are in decibels per micrometre

	Slope below tipping point (95% CI)	Slope above tipping point (95% CI)	Difference between slopes (95% CI)	P value
Mean	0.28 (0.18 to 0.38)	0.03 (−0.02 to 0.08)	0.25 (0.13 to 0.36)	<0.001
Temporal	0.39 (0.14 to 0.63)	−0.01 (−0.06 to 0.06)	0.39 (0.13 to 0.64)	0.003
Superior	0.25 (0.16 to 0.34)	0.02 (−0.01 to 0.05)	0.23 (0.14 to 0.33)	<0.001
Nasal	0.11 (−0.02 to 0.24)	−0.03 (−0.20 to 0.14)	0.14 (−0.07 to 0.36)	0.20
Inferior	0.16 (0.09 to 0.23)	0.03 (0.01 to 0.06)	0.13 (0.05 to 0.20)	<0.001
1:00	0.55 (0.07 to 1.03)	0.04 (0.13 to 0.77)	0.51 (0.02 to 0.99)	<0.001
5:00	0.35 (0.20 to 0.49)	0.01 (−0.03 to 0.05)	0.33 (0.18 to 0.48)	<0.001
6:00	0.11 (0.06 to 0.15)	0.02 (−0.01 to 0.05)	0.09 (0.03 to 0.14)	0.001
7:00	0.17 (0.09 to 0.25)	0.01 (−0.04 to 0.06)	0.16 (0.06 to 0.26)	<0.001
8:00	0.98 (0.39 to 1.57)	−0.09 (−0.19 to 0.01)	0.95 (0.35 to 1.54)	0.002
9:00	0.52 (0.02 to 1.01)	−0.09 (−0.19 to 0.01)	0.61 (0.10 to 1.12)	0.018
11:00	0.17 (0.10 to 0.24)	0.01 (−0.02 to 0.04)	0.16 (0.09 to 0.24)	<0.001
12:00	0.15 (0.06 to 0.23)	0.01 (−0.02 to 0.03)	0.14 (0.05 to 0.22)	0.002