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. Author manuscript; available in PMC: 2011 Jul 5.
Published in final edited form as: Acad Radiol. 2010 Oct 30;18(1):54–62. doi: 10.1016/j.acra.2010.08.021

TABLE 1.

Interobserver Agreement Between Two Radiologists for Volume, Uni- and Bidimensional, and CT Attenuation Coefficient Measurements

Types of Measurement Concordance
Correlation
Coefficient* 		Mean
Relative
Difference (%)		 95% limits of
Agreement (%)		 Percentage of
Observations
Inside the Limits (%)		 Standard
Deviation‡
Volume 0.990 (0.983–0.994) −3.7 26.0,18.6 90.5 0.112 (0.058)
Longest diameter 0.969 (0.949–0.982) 0.6 −23.1, 24.4 94.3 0.119 (0.098)
Longest perpendicular diameter 0.949 (0.914–0.970) 7.1 −23.9, 38.0 94.3 0.155 (0.105)
Bidimensional 0.966 (0.942–0.980) 7.3 −34.0, 48.6 92.4 0.207 (0.156)
CT attenuation coefficient 0.985 (0.975–0.991) −0.7 −55.1, 53.7† 92.4 27.2† (18.9)

CCC: concordance correlation coefficients; CT: computed tomography.

*

Data represent CCC; numbers in parentheses are the 95% confidence intervals.

†

The numbers in these cells are in Hounsfield units (HU).

‡

The numbers in parentheses represent trimmed standard deviation (SD), the SD of the relative difference after removing the top and botto 2.5% of the values.