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Table 1 Selected characteristics of the 964 participants.

From: Genotypes and haplotypes in the insulin-like growth factors, their receptors and binding proteins in relation to plasma metabolic levels and mammographic density

  All
Mean  
   Age at screening, y 61.4 (± 4.6)
   Age at menarche, y 13.3 (± 1.4)
   Age at first birth*, y 22.9 (± 3.7)
   Number of children* 2.9 (± 1.3)
   Education, y 9.8 (± 3.4)
   Age at menopause, y 48.6 (± 5.1)
   BMI, kg/m2 27.3 (± 4.8)
Frequency (%)  
   Ever Oral Contraceptive use 51.1
   Parous 92.6
   Ever postmenopausal hormone therapy use 43.4
   Current postmenopausal hormone therapy use 26.0
   Past postmenopausal hormone therapy use 17.3
   Never postmenopausal hormone therapy use 56.6
   Breast cancer in first degree relative 8.3
Median  
   Percent mammographic density, % 9.6 (0-69.2)
   Absolute mammographic density, cm2 14.8 (0-155.2)
   Non-dense mammographic area, cm2 147.0 (21.6-448.9)
   IGF1 (ng/ml) 28.7 (2.2-104.6)
   IGFBP3 (ng/ml) 151.2 (52.17-241.5)
  1. *Among parous women only.
  2. Data collected as part of the Tromsø Mammography and Breast Cancer(TMBC) study in Tromsø, Norway in 2001-2002, presented as mean (± standard deviation), frequency (%), and median (range).