|
Preoperative examination items
|
Group A
|
Group B
|
Total
|
χ2value
|
P value
|
Fisher’s exact probability
|
|---|
| |
Number
|
Percentage (%)
|
Number
|
Percentage (%)
| |
|---|
|
Tumor size estimated by palpation
|
≤20 mm
|
752
|
93.07
|
56
|
6.93
|
808
|
5.842
|
0.016
|
–
|
| |
>20 mm
|
1,408
|
95.46
|
67
|
4.54
|
1,475
| | | |
|
Total
|
2,160
| |
123
| |
2,283
| | | |
|
Lymph node status determined by palpation
|
No metastasis (N0)
|
1,470
|
95.08
|
76
|
4.92
|
1,546
|
0.315
|
0.575
|
–
|
| |
Metastasis (N1–3)
|
566
|
94.49
|
33
|
5.51
|
599
| | | |
|
Total
|
2,036
| |
109
| |
2,145*
| | | |
|
Molybdenum-target X-ray
|
Not used
|
1,368
|
96.75
|
46
|
3.25
|
1,414
|
12.333
|
<0.001
|
–
|
| |
Used
|
655
|
93.44
|
46
|
6.56
|
701
| | | |
|
Total
|
2,023
| |
92
| |
2,115*
| | | |
|
Ultrasonography
|
Not used
|
612
|
97.45
|
16
|
2.55
|
628
|
6.832
|
0.009
|
–
|
| |
Used
|
1,421
|
94.92
|
76
|
5.08
|
1,497
| | | |
|
Total
|
2,033
| |
92
| |
2,125*
| | | |
|
MRI
|
Not used
|
2,083
|
95.16
|
106
|
4.84
|
2,189
|
–
|
–
|
0.088
|
| |
Used
|
65
|
90.28
|
7
|
9.72
|
72
| | | |
|
Total
|
2,148
| |
113
| |
2,261*
| | | |
- * Patients whose data were not available are not included in the table.
