Table 2. CIRs of the focal hepatic lesions on DWI.

Classification of lesions	b-value (s/mm2)	Unenhanced	Enhanced	P value	Z value
HCC [47]	0	0.86±0.58	0.86±0.66	0.21	−1.264
	50	0.82±0.53	0.81±0.50	0.99	−0.017
	800	1.05±0.69	1.06±0.69	0.79	−0.271
	1,000	1.15±0.80	1.16±0.78	0.94	−0.07
	1,200	1.21±0.90	1.18±0.87	0.75	−0.317
Metastases [21]	0	0.97±0.52	0.93±0.56	0.74	−0.330
	50	0.81±0.58	0.94±0.58	0.39	−0.859
	800	1.2±0.98	1.02±0.73	0.47	−0.730
	1,000	1.24±0.87	1.41±0.90	0.07	−1.794
	1,200	1.32±1.05	1.56±1.00	0.10	−1.643
Cysts [12]	0	3.44±1.36	3.88±1.98	0.754	−0.314
	50	3.26±1.54	3.47±1.79	0.969	−0.039
	800	1.80±1.19	1.53±1.15	0.480	−0.706
	1,000	1.56±1.37	1.09±0.92	0.272	−1.099
	1,200	1.33±1.51	0.89±0.93	0.239	−1.177
Hemangiomas [12]	0	1.77±1.02	2.25±1.75	0.332	−0.971
	50	1.52±0.84	2.06±1.67	0.432	−0.787
	800	1.12±0.81	1.69±1.48	0.116	−1.573
	1,000	1.08±0.83	1.60±1.46	0.116	−1.571
	1,200	1.23±1.06	1.74±1.57	0.135	−1.494
Malignant lesions	0	0.90±0.56	0.88±0.57	0.741	−0.330
	50	0.82±0.54	0.86±0.54	0.664	−0.435
	800	1.10±0.78	1.04±0.70	0.470	−0.730
	1,000	1.18±0.81	1.23±0.83	0.159	−1.409
	1,200	1.24±0.94	1.32±0.93	0.100	−1.643
Benign lesions	0	2.60±1.45	3.06±2.01	0.355	−0.926
	50	2.39±1.50	2.76±1.84	0.637	−0.472
	800	1.46±1.06	1.61±1.30	0.475	−0.715
	1,000	1.32±1.13	1.35±1.22	0.742	−0.329
	1,200	1.28±1.22	1.31±1.33	0.775	−0.286
All lesions	0	1.34±1.15	1.45±1.48	0.664	−0.435
	50	1.23±1.13	1.35±1.34	0.982	−0.023
	800	1.19±0.87	1.19±0.94	0.946	−0.068
	1,000	1.21±0.90	1.32±1.05	0.294	−1.050
	1,200	1.25±1.03	1.45±1.48	0.165	−1.389

CIR, contrast intensity ratio; DWI, diffusion weighted imaging; HCC, hepatocellular carcinoma.