Table 2 Relative risks estimated using multivariate logistic regression for the Shandong Case-Control Study
From: Risk prediction for breast Cancer in Han Chinese women based on a cause-specific Hazard model
Variables | Code | RR | 95% CI | P-value | ||
|---|---|---|---|---|---|---|
Number of abortions | 0 | 0 | 1.000 | – |  | |
|  | 1–2 | 1 | 2.512 | 1.907 | 3.310 | <0.001 |
|  | ≥3 | 2 | 6.313 | 4.792 | 8.316 | |
Age at first live birth | < 25 | 0 | 1.000 | – | <0.001 | |
|  | 25–29 | 1 | 1.895 | 1.45 | 2.475 | |
|  | ≥30 | 2 | 3.589 | 2.747 | 4.690 | |
Benign breast disease history | No | 0 | 1.000 | – | 0.003 | |
| Â | Yes | 1 | 4.255 | 1.613 | 11.229 | |
BMI | < 24 | 0 | 1.000 | – | 0.006 | |
|  | 24–27.9 | 1 | 1.372 | 1.096 | 1.717 | |
|  | ≥28 | 2 | 1.882 | 1.503 | 2.356 | |
Breast cancer family history | No | 0 | 1.000 | – | 0.009 | |
| Â | Yes | 1 | 3.250 | 1.339 | 7.890 | |
Life satisfaction scores | < 13 | 0 | 1.000 | – | < 0.001 | |
|  | ≥13 | 1 | 2.424 | 1.777 | 3.308 | |