Table 4.

Comparison of different models for estimating the overall survival of IGA patients.

Index	Training cohort			Validation cohort
	Estimate	95%CI	P value	Estimate	95%CI	P value
NRI (vs. AJCC stage system)
For 3-year OS	0.4882	0.3674–0.5965		0.5705	0.3810–0.7206
For 5-year OS	0.5262	0.4191–0.6501		0.6779	0.4393–0.8873
For 8-year OS	0.5388	0.3878–0.7270		0.6356	0.4191–0.9018
IDI (vs. AJCC stage system)
For 3-year OS	0.093	0.071–0.121	< 0.001	0.096	0.063–0.145	< 0.001
For 5-year OS	0.096	0.074–0.126	< 0.001	0.119	0.079–0.178	< 0.001
For 8-year OS	0.130	0.074–0.181	< 0.001	0.108	0.058–0.178	0.01