Sampling variability of computer-aided fractal-corrected measures of liver fibrosis in needle biopsy specimens

Table 2 Coefficent of variability of fibrosis surface, wrinkledness and Hurst's exponent calculated in biopsy specimens taken at different liver sites

		CV (%)
Patient	Sections (n)	AF	W	H
1	6	57.28	16.86	13.90
2	8	36.31	17.31	15.27
3	8	55.9	40.22	16.86
4	8	19.79	27.89	10.71
5	6	56.64	29.17	14.87
6	8	48.44	31.78	17.74
7	6	41.05	38.29	11.67
8	6	45.05	40.01	15.41
9	8	55.67	14.13	11.45
10	8	29.38	33.06	16.13
11	8	26.31	18.14	12.68
12	8	44.94	26.37	15.13

N: number of biopsy sections; A_F: fractal rectified area; W: wrinkledness; H: Hurst's exponent; CV: coefficient of variability.