Improved Performance of Compartments in Detecting the Activity of Axial Spondyloarthritis Based on IVIM DWI with Optimized Threshold Value

Table 3

Intra- and interobserver agreement in the assessment of , , and .

Parameters	Intra- and interclass coefficient correlation (95% CI)
	Intraobserver	Interobserver
Threshold
(×10^−3 mm^2/s)	0.992 (0.985-0.996)	0.993 (0.987-0.997)
(%)	0.859 (0.750-0.923)	0.954 (0.915-0.975)
(×10^−3 mm^2/s)	0.873 (0.775-0.931)	0.914 (0.841-0.954)
Threshold
(×10^−3 mm^2/s)	0.990 (0.980-0.995)	0.994 (0.988-0.997)
(%)	0.923 (0.859-0.958)	0.848 (0.721-0.919)
(×10^−3 mm^2/s)	0.894 (0.809-0.942)	0.949 (0.907-0.973)
Threshold
(×10^−3 mm^2/s)	0.895 (0.811-0.943)	0.995 (0.991-0.997)
(%)	0.832 (0.705-0.907)	0.899 (0.818-0.945)
(×10^−3 mm^2/s)	0.897 (0.814-0.944)	0.898 (0.816-0.945)

: pure diffusion coefficient; : perfusion fraction; : pseudoperfusion coefficient; CI: confidence interval.