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. 2014 Dec;6(12):1697–1703. doi: 10.3978/j.issn.2072-1439.2014.11.05

Table 3. Univariate analysis of positive N2 nodes.

Variables Negative N2 node (%) Positive N2 node (%) P value
Sex
  Male 127 (85.8) 21 (14.2)
  Female 147 (88.0) 20 (12.0) 0.561
Age
  <59 128 (83.7) 25 (16.3)
  ≥59 146 (91.0) 16 (9.0) 0.088
Smoking status
  Never 193 (88.5) 25 (11.5)
  Current or former 81 (83.5) 16 (16.5) 0.221
Symptom
  Absent 206 (77.7) 29 (12.3)
  Present 68 (85.0) 12 (15.0) 0.541
Tumor size
  ≤1 cm 58 (96.7) 2 (3.3)
  1-2 cm 216 (84.7) 39 (15.3) 0.01
Tumor location
  Central 26 (81.2) 6 (18.8)
  Peripheral 248 (87.6) 35 (12.4) 0.459
Lobe distribution
  UL 181 (91.0) 18 (9.0)
  Non-UL 92 (80.0) 23 (20.0) 0.006
Histology
  AC 244 (86.8) 37 (13.2)
  Non-AC 30 (88.2) 4 (11.8) 0.818
  MPA 14 (58.3) 10 (41.7) <0.001
CEA
  <5 230 (80.9) 23 (9.1)
  ≥5 44 (71.0) 18 (29.0) <0.001

UL, upper lobes; AC, adenocarcinoma; MPA, micropapillary adenocarcinoma; CEA, carcinoembryonic antigen.