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Table 2 Two multivariate analysis models of overall survival in gastric cancer patients

From: Comparison of the 6th and 7th editions of the AJCC/UICC TNM staging system for gastric cancer focusing on the “N” parameter-related survival: the monoinstitutional NodUs Italian study

Variables Hazard ratio 95 % CI P value
(a) 6th AJCC N staging system (−2 log likelihood: 1548.021; linear trend χ 2: 1501.231; AIC value: 2591.3)
 Age at surgery 1.025 0.748–1.598 0.652
 Tumor location 0.984 0.548–1.746 0.985
 Histological grade 0.745 0.624–1.348 0.015
 Lauren’s classification 0.864 0.521–1.681 0.312
 The 6th N stage (AJCC) 1.256 0.894–1.612 0.007
(b) 7th AJCC N staging system (−2 log likelihood: 1541.013; linear trend χ 2: 1498.564; AIC value: 2601.4)
 Age at surgery 1.101 0.809–1.494 0.884
 Tumor location 1.003 0.756–1.319 0.731
 Histological grade 0.639 0.517–1.214 0.021
 Lauren’s classification 0.931 0.611–1.306 0.424
 The 7th N stage (AJCC) 1.481 1.112–2.031 0.011
  1. 95 % CI 95 % confidence interval, AJCC American Joint Committee on Cancer, AIC Akaike information criterion, N node