Table 3. Ranking of staging systems via the C-index.

Model	Training cohort			Validation cohort
	C-index	95% CI		C-index	95% CI
Nomogram	0.759	0.731–0.787		0.736	0.691–0.781
BCLC stage	0.584	0.550–0.617		0.570	0.524–0.617
TNM stage	0.594	0.558–0.631		0.583	0.533–0.633
CLIP score	0.575	0.538–0.610		0.611	0.562–0.659

TNM, tumor-node-metastasis staging system; CLIP, Cancer of the Liver Italian Program score; BCLC, Barcelona Clinic Liver Cancer staging system.