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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)