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FIG 6. Scatter plots show the intra- and inter-observer variability of repeated measurements in the assessment of the right and left volume of the PCA of 10 control subjects. A, shows intra-observer measurement (P.M.G.P.); and B, inter-observer measurement (P.M.G.P. versus T.S.). The limits of agreement between the first and second measurements are expressed as the mean difference in volume: [volume in the first measurement minus volume in the second measurement (mm3)] ± 2 SD. Inserts in the lower left corner show the association between the first (x-axis) and second (y-axis). Mean indicates mean difference in volume; +2 SD, mean difference in volume plus two SD; –2 SD, mean difference in volume minus two SD.
