Table 1. Odds ratios (ORs) for TNM classes in postmenopausal breast cancer by reproductive factors.
| Reproductive factors | T1 | Tis* vr. T1 | T2–T4** vr. T1 | N0 | N1–N3 vr. N0 | M0 | M1 vr. M0 | ||||||||
| N | N | OR (95%CI) | P | N | OR (95%CI) | P | N | N | OR (95%CI) | P | N | N | OR (95%CI) | P | |
| Parity1 | |||||||||||||||
| 1 (Ref.) | 1,924 | 39 | 1.00 | 1,620 | 1.00 | 2,546 | 1,005 | 1.00 | 2,862 | 145 | 1.00 | ||||
| 0 | 1,114 | 26 | 1.16 (0.70–1.93) | 0.57 | 816 | 1.08 (0.96–1.21) | 0.21 | 1,527 | 552 | 0.97 (0.85–1.09) | 0.58 | 1,638 | 55 | 0.90 (0.65–1.24) | 0.51 |
| 2 | 4,806 | 107 | 1.16 (0.80–1.68) | 0.44 | 3,043 | 0.82 (0.76–0.89) | <0.0001 | 6,030 | 2,160 | 0.91 (0.84–1.00) | 0.05 | 6,572 | 199 | 0.65 (0.52–0.82) | <0.01 |
| 3 | 2,185 | 50 | 1.19 (0.78–1.82) | 0.43 | 1,457 | 0.83 (0.75–0.91) | <0.01 | 2,676 | 1,070 | 0.99 (0.90–1.10) | 0.87 | 2,943 | 100 | 0.69 (0.53–0.89) | 0.01 |
| ≥4 | 765 | 12 | 0.79 (0.41–1.52) | 0.47 | 687 | 0.98 (0.86–1.11) | 0.73 | 988 | 435 | 1.03 (0.90-1.18) | 0.68 | 1,171 | 49 | 0.70 (0.50–0.98) | 0.04 |
| Total | 10,794 | 234 | 7,623 | 13,767 | 5,222 | 15,186 | 548 | ||||||||
Bold type: 95% CI does not include 1.00. The ORs were adjusted for:
1. Age at diagnosis, region, and occupation.
2. Age at diagnosis, region, occupation, and parity.
*
Carcinoma in situ.
**
The number of cases for T2 (N = 6,098), T3 (871), and T4 (654).