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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: Optom Vis Sci. 2011 Jan;88(1):140–149. doi: 10.1097/OPX.0b013e3181fc3467

Table 3.

Inferences from the Bland-Altman plots (Figure 1) to assess agreement between the stereometric parameter estimates of 2 HRT-II exams of participants in the HRT-II study group (n = 180).

Using the HRT parabolic error correction Using the modified parabolic error correction
Parameter Bias (95% CI) % eyes with differences
within the clinical limits
of agreement		 Outliers* Bias (95% CI) % eyes with
differences within the
clinical limits of
agreement		 Outliers*
Global rim area (mm2) 0.0103
(−0.0002, 0.0209)		 95.56%
(172 eyes)		 0%
(0 eyes)		 0.0104
(−0.0004, 0.0211)		 95.56%
(172 eyes)		 0%
(0 eyes)
Global rim volume (mm3) 0.0024
(−0.0045, 0.0093)		 97.22%
(175 eyes)		 0%
(0 eyes)		 0.0023
(−0.0047, 0.0094)		 96.67%
(174 eyes)		 0%
(0 eyes)
Global cup area (mm2) −0.0103
(−0.0209, 0.0002)		 95.56%
(172 eyes)		 1.11%
(2 eyes)		 −0.0104
(−0.0211, 0.0004)		 95.56%
(172 eyes)		 1.11%
(2 eyes)
Global cup volume (mm3) (−0.0003 −
0.0365×mean)† 		93.89%
(169 eyes)		 1.67%
(3 eyes)		 (−0.0001 −
0.0387×mean)† 		93.89%
(169 eyes)		 1.67%
(3 eyes)
Mean RNFL thickness (mm) 0.0004
(−0.0043, 0.0050)		 97.22%
(175 eyes)		 0%
(0 eyes)		 0.0002
(−0.0046, 0.0050)		 97.78%
(176 eyes)		 0%
(0 eyes)
*

Outliers: % eyes with stereometric parameter differences within the 95% limits of agreement, but were outside the corresponding clinical limits of agreement

†

Regression based bias estimate