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["Table 2. Univariate and multivariate Cox regression analysis of clinical features and risk score."]
["Characteristic","Training dataset",{"$nulls":3},"Validation dataset",{"$nulls":3},"Entire dataset"]
[null,"Univariate analysis",null,"Multivariate analysis",null,"Univariate analysis",null,"Multivariate analysis",null,"Univariate analysis",null,"Multivariate analysis"]
[null,"HR (95%CI)","P value","HR (95%CI)","P value","HR (95%CI)","P value","HR (95%CI)","P value","HR (95%CI)","P value","HR (95%CI)","P value"]
["Age (≥65 vs. <65)",2.32,"<0.001",2.41,"<0.001",1.62,0.049,1.37,0.376,1.95,"<0.001",1.54,0.119]
[null,"(1.43-3.76)",null,"(1.44-4.02)",null,"(1.01-2.61)",null,"(0.68-2.73)",null,"(1.39-2.74)",null,"(0.90-2.63)"]
["Gender (male vs. female)",1.21,0.436,null,null,0.58,0.019,0.57,0.115,0.85,0.32]
[null,"(0.75-1.97)",{"$nulls":3},"(0.37-0.91)",null,"(0.28-1.15)",null,"(0.61-1.17)"]
["TNM stage (III-IV vs. I-II)",2.78,"<0.001",2.35,0.046,1.78,0.021,1.01,0.977,2.19,"<0.001",1.07,0.867]
[null,"(1.57-4.94)",null,"(1.06-5.20)",null,"(1.09-2.92)",null,"(0.40-2.58)",null,"(1.51-3.17)",null,"(0.47-2.42)"]
["Tumor stage (T3-T4 vs. T1-T2)",1.54,0.047,0.66,0.114,1.27,0.273,null,null,1.39,0.032,1.09,0.795]
[null,"(1.00-2.37)",null,"(0.39-1.11)",null,"(0.83-1.94)",{"$nulls":3},"(1.03-1.88)",null,"(0.59-2.01)"]
["Lymph node metastasis (yes vs. no)",2.52,"<0.001",2.24,0.001,2.01,0.003,2.18,0.046,2.27,"<0.001",1.93,0.021]
[null,"(1.63-3.91)",null,"(1.36-3.71)",null,"(1.27-3.18)",null,"(1.02-4.69)",null,"(1.66-3.12)",null,"(1.11-3.37)"]
["Distant metastasis (yes vs. no)",4.04,0.06,null,null,2.97,0.014,1.46,0.476,3.37,0.001,2.03,0.105]
[null,"(0.94-17.28)",{"$nulls":3},"(1.25-7.07)",null,"(0.51-4.16)",null,"(1.61-7.06)",null,"(0.86-4.75)"]
["Risk score (high vs. low)",2.77,"<0.001",2.71,"<0.001",1.58,0.039,2.19,0.029,2.03,"<0.001",2.42,"<0.001"]
[null,"(1.76-4.34)",null,"(1.67-4.40)",null,"(1.02-2.42)",null,"(1.08-4.45)",null,"(1.49-2.77)",null,"(1.48-3.95)"]
["Abbreviations: HR, Hazard ratio; 95%CI, 95% confidence interval."]

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