Table 3.
Breast cancer incidence per 100,000 person-years (py) for all women, and according to physical activity level.
| All Women | Low Physical Activity | High Physical Activity | Relative Risk | ||||
|---|---|---|---|---|---|---|---|
| Women/Events (n) | BCs/100,000 py | Women/Events (n) | BCs/100,000 py | Women/Events (n) | BCs/100,000 py | (%) | |
| All | 15,983/1302 | 387 | 7990/699 | 418 | 7993/603 | 356 | –14.9 |
| Menopausal status | |||||||
| Premenopausal | 4299/405 | 423 | 2110/205 | 435 | 2189/200 | 412 | –5.3 |
| Perimenopausal | 1134/109 | 424 | 553/64 | 516 | 581/45 | 339 | –34.4 |
| Postmenopausal | 10,550/788 | 366 | 5327/430 | 399 | 5223/358 | 332 | –16.7 |
| Waist circumference (cm) | |||||||
| Lowest (≤73.0) | 5626/453 | 373 | 2496/199 | 370 | 3130/254 | 376 | 1.6 |
| Lower-middle (73.0–76.9) | 2749/210 | 356 | 1353/124 | 429 | 1396/86 | 287 | –33.1 |
| Upper-middle (77.0–83.9) | 3728/316 | 403 | 1930/190 | 472 | 1798/126 | 331 | –30.0 |
| Highest (≥84.0) | 3880/323 | 414 | 2211/186 | 420 | 1669/137 | 405 | –3.6 |
| Body Mass Index (kg/m2) | |||||||
| Lower-normal (<23.0) | 4935/383 | 362 | 2295/184 | 375 | 2640/199 | 351 | –6.3 |
| Upper-normal (23.0–24.9) | 3660/288 | 369 | 1755/154 | 413 | 1905/134 | 328 | –20.6 |
| Overweight (25.0–29.9) | 5272/456 | 415 | 2696/257 | 460 | 2576/199 | 369 | –19.7 |
| Obese (≥30.0) | 2116/175 | 406 | 1244/104 | 416 | 872/71 | 393 | –5.6 |
| Body fat (%) | |||||||
| Lowest (≤28.0) | 4024/329 | 383 | 1722/144 | 391 | 2302/185 | 377 | –3.7 |
| Lower-middle (28.0–31.9) | 4791/381 | 371 | 2311/204 | 415 | 2480/177 | 331 | –20.2 |
| Upper-middle (32.0–34.9) | 3510/294 | 399 | 1843/173 | 449 | 1667/121 | 345 | –23.1 |
| Highest (≥35.0) | 3595/293 | 400 | 2082/174 | 414 | 1513/119 | 382 | –7.8 |