Table 2.
Cox proportional hazard model for risk of breast cancer.
| No. of Breast Cancer Events | Observed Person-Years | ID | CrudeHR | 95% CI | p Value | aHR † | 95% CI | p Value | |
|---|---|---|---|---|---|---|---|---|---|
| Mastitis | |||||||||
| No | 36 | 20,576 | 1.7 | 1 | 1 | ||||
| Yes | 13 | 1918 | 6.8 | 3.87 | 2.05–7.3 | <0.001 | 3.71 | 1.96–7.02 | <0.001 |
| Age | |||||||||
| 40–50 | 26 | 12,250 | 2.1 | 1 | 1 | ||||
| ≥50 | 23 | 10,245 | 2.2 | 1.06 | 0.61–1.86 | 0.831 | 1.17 | 0.65–2.10 | 0.594 |
| Hypertension | 2 | 3979 | 0.5 | 0.20 | 0.05–0.82 | 0.025 | 0.14 | 0.03–0.58 | 0.007 |
| Hyperlipidemia | 10 | 2725 | 3.7 | 1.87 | 0.93–3.74 | 0.078 | 2.53 | 1.15–5.57 | 0.021 |
| Diabetes | 4 | 1871 | 2.1 | 0.99 | 0.35–2.74 | 0.980 | 0.89 | 0.29–2.74 | 0.835 |
| Hypothyroidism | 1 | 224 | 4.5 | 2.07 | 0.29–15.02 | 0.471 | 1.59 | 0.22–11.76 | 0.649 |
| Autoimmune diseases | 1 | 523 | 1.9 | 0.87 | 0.12–6.33 | 0.894 | 0.93 | 0.13–6.77 | 0.945 |
ID: incidence density (per 1000 person-years). HR: hazard ratio; aHR: adjusted hazard ratio. † Adjusted for age, hypertension, hyperlipidemia, diabetes, hypothyroidism, and autoimmune diseases.