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Table 1 Baseline characteristics of the enrolled patients

From: Role of skip N2 lymph node metastasis for patients with the stage III-N2 lung adenocarcinoma: a propensity score matching analysis

Variable

Before PSM

After PSM

SKN2

Non-SKN2

p

SKN2

Non-SKN2

p

Age

  

0.358

  

0.073

< 65 y

76(67.9%)

249(72.4%)

 

76(67.9%)

72(64.3%)

 

≥ 65 y

36(32.1%)

95(27.6%)

 

36(32.1%)

40(35.7%)

 

Sex

  

0.002

  

0.681

Male

67(59.8%)

148(43.0%)

 

67(59.8%)

62(55.4%)

 

Female

45(40.2%)

196(57.0%)

 

45(40.2%)

50(44.6%)

 

Smoking history

  

0.894

  

0.383

Smoking

31(27.7%)

93(27.0%)

 

31(27.7%)

43(38.4%)

 

No smoking

81(72.3%)

251(72.0%)

 

81(72.3%)

69(61.6%)

 

Visceral pleura invasion

  

0.106

  

1.000

Invaded

36(32.1%)

140(40.7%)

 

36(32.1%)

39(34.8%)

 

Not invaded

76(67.9%)

204(59.3%)

 

76(67.9%)

73(65.2%)

 

Vascular tumour thrombus

  

0.280

  

0.067

Yes

21(18.8%)

88(25.6%)

 

21(18.8%)

29(25.9%)

 

No

91(81.2%)

256(74.4%)

 

91(81.2%)

83(74.1%)

 

Nerve invasion

  

0.065

  

0.811

Yes

9(8.0%)

51(14.8%)

 

9(8.0%)

13(11.6%)

 

No

103(92.0%)

293(85.2%)

 

103(92.0%)

99(88.4%)

 

EGFR mutation

  

< 0.001

  

0.811

Mutation

46(41.1%)

80(23.3%)

 

46(41.1%)

31(27.7%)

 

No mutation

28(25.0%)

152(44.2%)

 

28(25.0%)

27(24.1%)

 

No detection

38(33.9%)

112(32.6%)

 

38(33.9%)

54(48.2%)

 

Size

  

< 0.001

  

0.410

≤ 3 cm

72(64.3%)

154(44.8%)

 

72(64.3%)

59(52.7%)

 

> 3 cm

40(35.7%)

190(55.2%)

 

40(35.7%)

53(47.3%)

 

Grade

  

0.071

  

0.221

Well differentiated*

71(63.4%)

249(72.4%)

 

71(63.4%)

62(55.4%)

 

Poorly

41(36.6%)

95(27.6%)

 

41(36.6%)

50(44.6%)

 

Metastasis stations

  

0.878

  

0.567

1 station

38(33.9%)

114(33.1%)

 

38(33.9%)

34(30.4%)

 

> 1 station

74(66.1%)

230(66.9%)

 

74(66.1%)

78(69.6%)

 
  1. * comment: The highly differentiated types include acinar type, volt type and papillary type. The types of low differentiation include solid type and micropapillary type