Table 2.

Multivariate logistic regression for factors associated with mastectomy for both countries

Variable	SE	OR	95% CI Wald	p value
Country				<0.01*
China	0.27	4.23	2.50–7.14
Italy	Reference
Age				0.99
≤40 years	0.27	1.00	0.59–1.71
>40 years	Reference
Histotype				0.04*
In situ	0.33	0.39	0.21–0.74
Invasive	Reference
Tumour size				<0.01*
>2 cm	0.24	0.36	0.22–0.59
≤2 cm	Reference
Lymph node status				<0.01*
Negative	0.25	0.27	0.17–0.043
Positive	Reference

^*Statistically significant.