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Table 1 Patient characteristics and survival according to the current and new nodal classifications

From: Evaluation of new classifications of N descriptor in non-small cell lung cancer (NSCLC) based on the number and the ratio of metastatic lymph nodes

Variables Number of patients 5-year survival (%) 95 % CI p value
Age
 ≤68 279 59.5 56.2–63.0 <0.001
 >68 250 46.4 43.6–49.4  
Sex
 Male 377 50.4 47.9–53.0 0.016
 Female 152 60.5 56.0–65.5  
Histology
 Adenocarcinoma 251 50.2 47.2–53.4 0.1
 Other 278 56.1 52.9–59.5  
Surgery
 Lobectomy 457 55.1 52.7–57.7 0.01
 Pneumonectomy 72 41.7 37.1–46.8  
pT
 pT1a 72 72.2 65.0–80.2 <0.001
 pT1b 69 78.3 70.9–86.4  
 pT2a 219 54.8 51.3–58.5  
 pT2b 69 46.4 41.1–52.3  
 pT3 93 23.7 21.7–25.8  
 pT4 7 28.6 18.8–43.4  
CLN
 CLN0 377 62 59.1–65.2 p < 0.001
 CLN1 62 42 37.0–47.5  
 CLN2 90 24 22.3–26.7  
NLN
 NLN0 377 62 59.1–65.2 p < 0.001
 NLN1 70 39 34.3–43.3  
 NLN2 82 26 23.3–28.2  
RLN
 RLN0 377 62 59.1–65.2 p < 0.001
 RLN1 76 37 33.0–41.1  
 RLN2 76 26 23.8–29.1  
  1. CI confidence interval, CLN current nodal classification, NLN new classification based on the number of metastatic lymph nodes, RLN new classification based on the ratio of metastatic to resected lymph nodes