TABLE 3.

The Neuroretinal Rim Broken-stick Model With Associated Slopes Above and Below the Tipping Point, the Point at Which MDB Neuroretinal Rim Thinning is First Associated With Visual Field Damage

Anatomic Region	Slope Below the Tipping Point [95% CI] (dB/μm)	P*	Slope Above the Tipping Point [95% CI] (dB/μm)	P†	Difference Between Slopes Below and Above the Tipping Points (dB/μm)	P‡
Global	0.086 [0.063, 0.108]	<0.001	0.011 [−0.025, 0.048]	0.266	0.074	<0.001
Superior	0.108 [0.080, 0.136]	<0.001	0.010 [−0.033, 0.053]	0.319	0.097	<0.001
Inferior	0.143 [0.101, 0.185]	<0.001	0.018 [−0.045, 0.081]	0.286	0.125	<0.001
Nasal	0.070 [0.044, 0.097]	<0.001	0.013 [−0.031, 0.056]	0.280	0.058	0.014
Temporal	0.091 [0.058, 0.124]	<0.001	0.017 [−0.033, 0.066]	0.256	0.074	0.007
Superior-nasal	0.090 [0.061, 0.120]	<0.001	0.011 [−0.036, 0.057]	0.327	0.080	0.003
Superior-temporal	0.116 [0.080, 0.152]	<0.001	0.011 [−0.042, 0.065]	0.339	0.105	0.001
Inferior-nasal	0.111 [0.073, 0.148]	<0.001	0.019 [−0.039, 0.077]	0.260	0.092	0.005
Inferior-temporal	0.103 [0.063, 0.142]	<0.001	0.016 [−0.047, 0.080]	0.304	0.086	0.012

All P-values are taken as statistically significant when P<0.05.

^*P-values for the slopes below the tipping points represent the statistical significance of the slopes being different than 0.

^†P-values for the slopes above the tipping points represent the statistical significance of the slopes being different than 0.

^‡P-values for the last column represent the statistical significance of the difference between the slopes below the tipping points and above the topping point.

CI indicates confidence interval; MDB, minimum distance band.