Table 1 Demographic and clinical characteristics of the MDACC study sample compared with the sample used to develop the model of Silber and colleagues [1]
Characteristic | MDACC study patients (1986–92) (n = 143) | Silber and colleagues' patients (1985–93) (n = 95) |
|---|---|---|
Mean age (years) | 46 (SD 10) | 46 (SD N/A) |
Menopausal status (%) | ||
Pre- | 55 | 60 |
Peri-, post, or surgical | 45 | 40 |
Estrogen receptor status (%) | ||
Positive | 53 | 47 |
Negative | 37 | 48 |
Unknown | 10 | 4 |
Progesterone receptor status (%) | ||
Positive | 51 | 48 |
Negative | 36 | 39 |
Unknown | 13 | 13 |
Tumor size (cm) (%) | ||
<2 | 36 | 41 |
2–5 | 58 | 52 |
>5 | 6 | 4 |
Unknown | - | 3 |
Number of nodes (%) | ||
0 | 14 | - |
1–3 | 61 | 76 |
4–9 | 16 | 16 |
>9 | 9 | 5 |
Unknown | - | 3 |