Table 3.

Univariate and multivariate analyses for DSS in the training set.

Variable	Training set
	Univariate analysis	Multivariate analysis
	p-value	HR (95% CI)	p-value
Age (≤60/>60)	<0.001a	1.89 (1.17–3.05)	0.009a
Sex (female/male)	0.187
T stage (Ⅰ/Ⅱ/Ⅲ/Ⅳ)	<0.001a	1.80 (1.37–2.35)	<0.001a
Necrosis (no/yes)	<0.001a	2.69 (1.61–4.48)	<0.001a
Lymph node involvement (no/yes)	<0.001a	5.53 (2.47–12.38)	<0.001a
Sarcomatoid differentiation (no/yes)	<0.001a	4.52 (2.23–9.16)	<0.001a
CID (<50%/≥50%)	<0.001a	10.78 (6.63–17.53)	<0.001a
Tumor size, cm (4≤/4–7/>7)	<0.001a

DSS, disease-specific survival; HR, hazard ratio; CI, confidence interval; CID, contour irregularity degree.

^aIndicate statistical significance.