Table 1 Comparison of baseline characteristics between EIN group and control group
Characteristics | Before matching | After matching | ||||
|---|---|---|---|---|---|---|
Control group (n = 103) | EIN group (n = 21) | p value | Control group (n = 42) | EIN group (n = 21) | p value | |
Age(years) | 63.58 ± 7.2 | 61.95 ± 7.68 | 0.352 | 61.02 ± 7.25 | 61.95 ± 7.68 | 0.649 |
Sex | Â | Â | 0.885 | Â | Â | 0.496 |
 Man | 87 | 18 |  | 33 | 18 |  |
 Female | 16 | 3 |  | 9 | 3 |  |
BMI (kg/m2) | 23.48 ± 3.56 | 21.92 ± 3.50 | 0.068 | 21.7 ± 3.201 | 21.92 ± 3.50 | 0.855 |
Diabetes | Â | Â | 0.661 | Â | Â | 0.595 |
 Yes | 7 | 2 |  | 2 | 2 |  |
 No | 96 | 19 |  | 40 | 19 |  |
Hypertension |  |  | 0.179 |  |  | > 0.999 |
 Yes | 35 | 4 |  | 9 | 4 |  |
 No | 68 | 17 |  | 33 | 17 |  |
Smoking |  |  | 0.417 |  |  | > 0.999 |
 Yes | 59 | 10 |  | 20 | 10 |  |
 No | 44 | 11 |  | 22 | 11 |  |
Alcohol | Â | Â | 0.795 | Â | Â | 0.858 |
 Yes | 62 | 12 |  | 23 | 12 |  |
 No | 41 | 9 |  | 19 | 9 |  |
Type of operation | Â | Â | 0.327 | Â | Â | 0.858 |
 Minimal invasive | 61 | 10 |  | 19 | 10 |  |
 Open | 42 | 11 |  | 23 | 11 |  |
Operation time (h) | 3.73 ± 0.83 | 4.03 ± 0.82 | 0.133 | 3.63 ± 0.749 | 4.03 ± 0.82 | 0.057 |
T stage | Â | Â | 0.650 | Â | Â | 0.759 |
 T1 | 8 | 1 |  | 3 | 1 |  |
 T2 | 17 | 5 |  | 6 | 5 |  |
 T3 | 57 | 9 |  | 24 | 9 |  |
 T4 | 5 | 2 |  | 3 | 2 |  |
 Unknown | 16 | 4 |  | 6 | 4 |  |
N stage | Â | Â | 0.917 | Â | Â | 0.538 |
 N0 | 42 | 7 |  | 21 | 7 |  |
 N1 | 30 | 7 |  | 11 | 7 |  |
 N2 | 17 | 4 |  | 7 | 4 |  |
 N3 | 3 | 0 |  | 0 | 0 |  |
 4 (unknown) | 11 | 3 |  | 3 | 3 |  |
M stage | 0 | 0 | Â | Â | 0 | Â |
Tumor site | Â | Â | 0.555 | Â | Â | 0.206 |
 Upper | 8 | 1 |  | 3 | 1 |  |
 Middle | 63 | 11 |  | 30 | 11 |  |
 Lower | 32 | 9 |  | 9 | 9 |  |
Degree of differentiation | Â | Â | 0.338 | Â | Â | 0.627 |
 Well | 13 | 5 |  | 8 | 5 |  |
 Moderately | 66 | 13 |  | 23 | 13 |  |
 Poorly | 24 | 3 |  | 11 | 3 |  |
Size (cm) | 3.67 ± 1.63 | 3.83 ± 1.76 | 0.671 | 3.18 ± 1.48 | 3.83 ± 1.76 | 0.126 |