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Table 1 Demographic and baseline characteristics of NSCLC cases from the Surveillance, Epidemiology, and End Results (SEER) database between 2004 and 2015

From: The lymph node ratio predicts cancer-specific survival of node-positive non-small cell lung cancer patients: a population-based SEER analysis

Characteristics No. (%)
Male gender 6016 (53.1)
Race
 White 9335 (82.3)
 Black 1087 (9.6)
 Others 919 (8.1)
Age, years
  > 60 8138 (71.8)
Primary site
 Upper lobe 6054 (53.4)
 Lower lobe 3757 (33.1)
 Main bronchus 255 (2.3)
 Middle lobe 532 (4.7)
 Overlapping/NOS 743 (6.6)
Grade
 I/II 4643 (48.0)
 III/IV 5033 (52.0)
Histology
 Adenocarcinoma 6159 (54.3)
 Squamous 3134 (27.6)
 Others 2048 (18.1)
T stage
 T1 2842 (25.9)
 T2 5892 (53.6)
 T3 665 (6.1)
 T4 1596 (14.5)
N stage
 N_N1 6384 (56.3)
 N_N2 4362 (38.5)
 N_N3 595 (5.3)
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