Table 6.

Multiple Comparisons of Prediction of pCR by US Between Different Subtypes (Significance Threshold, P <0.008)

Subtypes	Accuracy		PPV		NPV
	χ2	P	χ2	P	χ2	P
1 vs 2	6.5	0.011	6.0	0.014	17.8	<0.001
1 vs 3	15.6	<0.001	4.8	0.028	24.4	<0.001
1 vs 4	0.6	0.455	2.1	0.145	2.7	0.103
2 vs 3	52.4	<0.001	22.5	<0.001	106.9	<0.001
2 vs 4	3.4	0.067	0.9	0.338	7.0	0.008
3 vs 4	24.4	<0.001	13.6	<0.001	50.1	<0.001

Notes: 1, HR+/HER2+; 2, HR-/HER2+; 3, HR+/HER2-; 4, TN (triple negative).