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

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

Preoperative examination items		Group A		Group B		Total	χ²value	P value	Fisher’s exact probability
		Number	Percentage (%)	Number	Percentage (%)		χ²value	P value	Fisher’s exact probability
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*

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