Study on Clinicopathological Features and Risk Factors of Patients with Multiple Primary Breast Cancers and Thyroid Disease

Table 4

Variable assignment of influencing factors for multiple primary breast cancers complicated with thyroid lesions.

Variable	Assignment
Dependent variable
Breast cancer	Simple breast cancer = 0; combined thyroid lesions = 1
Independent variable
Age	≤35 years old, ≥60 years old = 0; 35–60 years = 1
Menopausal status	No menopause = 0; menopause = 1
Nuclear proliferation antigen index	Positive = 0; negative = 1