Table 1.
Number of Individuals, Person-Years, and Number of Deaths Due to Breast Cancer, According to Tumor Characteristics, Body Mass Index, and Treatment, Among Women Aged 50–74 Years, Diagnosed With Postmenopausal Breast Cancer in Sweden During 1993–1995
| Characteristic | No. of Individuals | Person-Years | No. of Deaths |
|---|---|---|---|
| Estrogen-receptor status | |||
| Negative | 242 | 2,727.6 | 60 |
| Positive | 1,003 | 12,532.8 | 159 |
| Missing | 495 | 6,405.5 | 50 |
| Grade | |||
| Well differentiated | 186 | 2,494.1 | 8 |
| Moderately differentiated | 509 | 6,441.4 | 74 |
| Poorly differentiated | 497 | 5,940.2 | 114 |
| Missing | 548 | 6,790.1 | 73 |
| Body mass indexa | |||
| First quartile (14.53–22.89) | 435 | 5,489.7 | 61 |
| Second quartile (22.94–25.28) | 434 | 5,500.2 | 60 |
| Third quartile (25.31–28.08) | 431 | 5,396.8 | 64 |
| Fourth quartile (28.13–52.34) | 440 | 5,279.1 | 84 |
| Size of tumor, mm | |||
| 1–9 | 366 | 4,741.1 | 21 |
| 10–19 | 817 | 10,617.7 | 92 |
| 20–29 | 359 | 4,229.3 | 90 |
| 30–39 | 116 | 1,273.7 | 29 |
| 40–49 | 43 | 448.0 | 17 |
| ≥50 | 39 | 356.1 | 20 |
| No. of affected lymph nodes | |||
| 0 | 1,253 | 16,323.2 | 110 |
| 1–3 | 335 | 3,954.7 | 78 |
| 4–9 | 106 | 1,069.9 | 47 |
| ≥10 | 46 | 318.0 | 34 |
| Chemotherapy | |||
| No | 1,613 | 20,383.6 | 216 |
| Yes | 127 | 1,282.3 | 53 |
| Radiotherapy | |||
| No | 973 | 11,580.4 | 196 |
| Yes | 767 | 10,085.5 | 73 |
a Weight (kg)/height (m)2.