Table 4
Reproductive factors in the Swedish population (1980) and in the female cabin crew (1946–96) together with estimates from a Nordic meta-analysis of relative risk of breast cancer due to reproductive factors22
| Reproductive factors | RR* | Population | Cabin crew | ||
|---|---|---|---|---|---|
| No. | % | No. | % | ||
| *Relative risks associated with reproductive factors in the Nordic countries.22 | |||||
| Parity | |||||
| Parous | 1.00 | 2178139 | 73.2 | 1685 | 72.5 |
| Nulliparous | 1.29 | 796077 | 26.8 | 639 | 27.5 |
| Number of children | |||||
| 1–2 | 1.00 | 1549831 | 71.1 | 1314 | 78.0 |
| 3–4 | 0.84 | 546197 | 25.1 | 363 | 21.5 |
| 5 or more | 0.69 | 82111 | 3.8 | 8 | 0.5 |
| Age at birth of first child (y) | |||||
| <20 | 1.00 | 261719 | 12.0 | 11 | 0.6 |
| 20–24 | 1.04 | 850064 | 39.0 | 113 | 6.7 |
| 25–29 | 1.17 | 655973 | 30.1 | 748 | 44.4 |
| 30–34 | 1.30 | 277152 | 12.8 | 623 | 37.0 |
| >34 | 1.40 | 133231 | 6.1 | 190 | 11.3 |
