Table 1 Clinicopathological characteristic of patients from Sun Yat-sen University Cancer Center database before and after propensity score matching

Variables

P value

P value

 Sex, n (%)

0.360^*

0.212^*

  Male

251 (71.3%)

264 (74.4%)

173 (74.9%)

161 (69.7%)

  Female

101 (28.7%)

91 (25.6%)

58 (25.1%)

70 (30.3%)

 Drinking history, n (%)

0.001^*

0.761^*

  No

271 (77.0%)

235 (66.2%)

163 (70.6%)

160 (69.3%)

  Yes

81 (23.0%)

120 (33.8%)

68 (29.4%)

71 (30.7%)

 Smoking history, n (%)

0.004^*

0.774^*

  No

152 (43.2%)

116 (32.7%)

87 (37.7%)

90 (39.0%)

  Yes

200 (56.8%)

239 (67.3%)

144 (62.3%)

141 (61.0%)

 Tumor differentiation, n (%)

0.373^*

0.318^*

  Well

84 (23.9%)

96 (27.0%)

54 (23.4%)

60 (26.0%)

  Moderate

192 (54.5%)

175 (49.3%)

126 (54.5%)

110 (47.6%)

  Poor

76 (21.6%)

84 (23.7%)

51 (22.1%)

61 (26.4%)

 pT stage, n (%)

0.033^*

0.955^*

  T1

60 (17.0%)

47 (13.2%)

35 (15.2%)

37 (16.0%)

  T2

107 (30.4%)

87 (24.5%)

56 (24.2%)

54 (23.4%)

  T3

185 (52.6%)

221 (62.3%)

140 (60.6%)

140 (60.6%)

 Surgical approaches, n (%)

< 0.001^*

0.095^**

  Sweet

287 (81.5%)

194 (54.6%)

178 (77.1%)

179 (77.5%)

  Ivor-Lewis

15 (4.3%)

9 (2.5%)

10 (4.3%)

9 (3.9%)

  McKeown

37 (10.5%)

145 (40.8%)

33 (14.3%)

41 (17.7%)

  Other

13 (3.7%)

7 (2.1%)

10 (4.3%)

2 (0.9%)

 Transthoracic laterality, n (%)

< 0.001^**

0.735^**

  Left

293 (83.2%)

196 (55.2%)

182 (78.8%)

179 (77.5%)

  Right

57 (16.2%)

156 (43.9%)

48 (20.8%)

52 (22.5%)

  Other

2 (0.6%)

3 (0.9%)

1 (0.4%)

0 (0.0%)

 Two-field dissection, n (%)

0.093^*

1.000^*

  No

30 (8.5%)

44 (12.4%)

7 (3.0%)

8 (3.5%)

  Yes

322 (91.5%)

311 (97.6%)

224 (97.0%)

223 (96.5%)

 Three-field dissection, n (%)

< 0.001^**

1.000^**

  No

349 (99.1%)

316 (89.0%)

228 (98.7%)

227 (98.3%)

  Yes

3 (0.9%)

39 (11.0%)

3 (1.3%)

4 (1.7%)

 Tumor location, n (%)

0.647^*

0.776^*

  Upper

31 (8.8%)

36 (10.1%)

14 (6.1%)

12 (5.2%)

  Middle

123 (34.9%)

131 (36.9%)

76 (32.9%)

83 (35.9%)

  Lower

198 (56.3%)

188 (53.0%)

141 (61.0%)

136 (58.9%)

 Age (year), n (%)

0.312^*

0.453^*

   ≤ 60

196 (55.7%)

211 (59.4%)

134 (58.0%)

126 (54.5%)

   > 60

156 (44.3%)

144 (40.6%)

97 (42.0%)

105 (45.5%)

 Median (interquartile range)

59 (14)

59 (12)

0.972^***

59 (15)

60 (12)

0.082^***

 Tumor length (cm)

0.013^**

0.705^*

   ≤ 3

192 (55.2%)

162 (45.8%)

107 (46.9%)

112 (48.7%)

   > 3

156 (44.8%)

192 (54.2%)

121 (53.1%)

118 (51.3%)

 Median (interquartile range)

3.0 (2.0)

3.5 (2.5)

0.001^***

3.5 (2.0)

3.5 (2.5)

0.776^***