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Table 4 Effects of preoperative examinations on the frequency of intraoperative frozen section examination use

From: Application of intraoperative frozen section examination in the management of female breast cancer in China: a nationwide, multicenter 10-year epidemiological study

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*    
  1. * Patients whose data were not available are not included in the table.