Table 5. Area under the ROC curve and summary statistics of the diagnostic value of the LSM and AFC indices for stages of liver fibrosis ≥ F2.

	LSM	AFC
AUROC	0.709**	0.866***
Significance (2-tailed)	0.006	0.000
Cut-off value	7.042	2.256
Youden index	0.426	0.648
Sensitivity	72.22%	83.33%
Specificity	70.37%	81.48%
PPV	35.14%	50.00%
NPV	91.94%	95.65%
Diagnose accuracy	70.71%	81.82%

** the significance level of the statistics P < 0.01.

*** the significance level of the statistics P < 0.001.