Table 2. Pathological complete response.

	TOTAL	CTZ group(%)95%CI †		CT group(%) 95%CI †		Pvalue*
All patients	179	13/88(14.8)	7.4–22.2	7/91(7.7)	2.2–13.2	0.066
Pre menopausal	102	6/50(12.0)	3.0–21.0	5/52(9.6)	1.6–17.6	0.349
Post menopausal	77	7/38(18.4)	6.1–30.7	2/39(5.1)	0.0–12.0	0.071**
Luminal	145	7/71(9.9)	3.0–16.8	5/74(6.8)	1.1–12.5	0.249
Triple negative (TN)	34	6/17(35.3)	12.6–58.0	2/17(11.8)	0.0–27.1	0.112**
Pre menopausal & TN	17	2/9 (22.2)	0.0–49.1	2/8(25.0)	0.0–55.0	0.665**
Post menopausal & TN	17	4/8(50.0)	15.4–84.6	0/9 (0.0)		0.029**

† 95 percent confidence interval.

*P value based on one-sided chi-squared test.

**P value based on Fisher’s exact test.

CTZ = chemotherapy + zoledronic acid; CT = chemotherapy alone.