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| Covariate | Univariate CRR (95 % CI) | Multivariate ARR (95 % CI) |
| Intervention | ||
| Single | 1 | 1 |
| Double | 0.46 (0.17-1.21) | 0.46 (0.17-1.22) |
| Neoadjuvant therapy | ||
| No | 1 | 1 |
| Yes | 1.17 (0.44-3.09) | 1.14 (0.43-3.02) |
| BMI | ||
| Normal | 1 | 1 |
| Overweight | 0.77 (0.25-2.34) | 0.74 (0.24-2.26) |
| Obese | 1.03 (0.13-7.47) | 1.00 (0.13-7.60) |
| CRR: Crude relative risk, ARR: Adjusted relative risk, CI: Confidence Interval. | ||
