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Table 1 Characteristics of cases and control subjects

From: A clinical model for identifying the short-term risk of breast cancer

Study participant characteristics Cases Control subjects p Valuea
Number of women 433 1732
Age at breast cancer diagnosis, mean (SD) 59.0 (9.4)
Years from mammography to breast cancer, median 1.74
Invasive breast cancer, % 88
Screening detected breast cancer, % 63
Age at mammography, mean (SD) 57.4 (9.2) 57.4 (9.2) 0.99
BMI, mean (SD) 25.6 (4.6) 25.3 (4.0) 0.19
Age at menarche, mean (SD) 13.1 (1.4) 13.2 (1.5) 0.61
Parity, % 89 88 0.56
Age at first birth, mean (SD) 27.1 (5.4) 26.6 (5.2) 0.11
Current use of HRT, % 6.9 4.4 0.05
Postmenopausal, % 65 65 0.78
Breast cancer in family, % 19 13 4.5 × 10−4
  1. BMI Body mass index, HRT Hormone replacement therapy
  2. a p Values for means were calculated with Student’s t test, medians with Wilcoxon rank-sum test, and percentages with the chi-square test