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Table 1 Descriptive characteristics of study participants (Mean ± Standard Deviation): WEB Study, 1996–2001.

From: Assessing spatio-temporal variability of risk surfaces using residential history data in a case control study of breast cancer

  Premenopausal Postmenopausal
  Case (n = 325) Control (n = 610) Case (n = 841) Control (n = 1495)
Age (years) 44.9 ± 4.6 44.1 ± 4.6 63.0 ± 8.5 63.4 ± 8.9
Education (years) 14.0 ± 2.3 14.2 ± 2.2 13.3 ± 2.6 13.0 ± 2.3
Parity 1.9 ± 1.3 2.0 ± 1.3 3.0 ± 1.9 2.5 ± 1.8
Age at menarche (years) 12.5 ± 1.6 12.6 ± 1.6 12.6 ± 1.6 12.8 ± 1.7
Age at first birth (years) 25.0 ± 5.1 25.8 ± 4.8 23.8 ± 4.7 23.5 ± 4.3
Recent BMI (kg/m2) 26.7 ± 6.6 27.2 ± 6.8 28.9 ± 6.1 28.4 ± 6.4
Benign breast disease (yes) 37% 21% 33% 22%
Relative with breast cancer (yes) 21% 10% 20% 14%