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Table 1 Selected characteristics of breast cancer cases and controls

From: Vitamin D pathway gene polymorphisms, diet, and risk of postmenopausal breast cancer: a nested case-control study

Variable Cases n = 500 Controls n = 500
  Mean ± standard deviation
Age at baseline (years) 61.9 ± 6.0 61.9 ± 6.0
Age at menarche (years) 12.7 ± 1.4 12.6 ± 1.4
Age at menopause (years) 48.5 ± 6.4 48.1 ± 6.0
Paritya 3.0 ± 1.2 3.3 ± 1.5
Race Percentage
   White 98.6 98.8
   Other or missing 1.4 1.2
History of breast cyst 38.8 30.0
Family history of breast cancer 20.2 15.0
Ever pregnant 88.8 90.0
  1. aMean number of children only among parous women.