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Table 1 Characteristics of the study population.

From: Variables with time-varying effects and the Cox model: Some statistical concepts illustrated with a prognostic factor study in breast cancer

  N (%)
Year of diagnosis   
1989 231 23.6
1990 207 21.1
1991 182 18.6
1992 189 19.3
1993 170 17.4
Metastases following surgery   
Yes 264 27.0
No 715 73.0
Age at diagnosis   
≤ 40 years 76 7.8
> 40 years 903 92.2
SBR Grade   
Grade I 275 28.1
Grade II 444 45.3
Grade III 260 26.6
Tumor size   
≤ 20 mm 753 76.9
> 20 mm 226 23.1
Lymph node involvement   
No 554 56.6
Yes 425 43.4
Peritumoral vascular invasion   
No 700 71.5
Yes 279 28.5
Hormone Receptor status   
Both ER- and PR- 178 18.2
At least ER+ or PR+ 801 81.8
Her2 status   
Positive 100 10.2
Negative 879 89.8
Mib1 status   
Negative 691 70.6
Positive 288 29.4