Table 2. .

Mean Absolute Difference in Amplitude Between Cirrus and RTVue A-Scan Profiles Using Speckle Noise Reduction as the Next Step Following Z-Scaling and Sampling Density Normalization

	Overall (%)	Temporal (%)	Superior (%)	Nasal (%)	Inferior (%)
Baseline residual	12.7	12.8	12.4	13.0	12.6
First percentile	14.6 (1.9)	15.9 (3.1)	13.3 (0.9)	15.5 (2.5)	13.7 (1.1)
33rd percentile	12.4 (−0.3)	12.7 (−0.1)	12.1 (−0.2)	12.6 (−0.5)	12.3 (−0.3)
50th percentile	12.7 (−0.0)	13.0 (0.3)	12.4 (0.1)	12.8 (−0.2)	12.5 (−0.0)
66th percentile	12.8 (0.1)	13.1 (0.3)	12.6 (0.2)	12.9 (−0.1)	12.6 (−0.0)

Absolute difference is in percentage with the difference of baseline residual from the residual after speckle noise reduction in parentheses.