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Table 1 Characteristics of no, past and current estrogen and progestin therapy (EPT) users (N = 2,036).

From: Polymorphisms in hormone metabolism and growth factor genes and mammographic density in Norwegian postmenopausal hormone therapy users and non-users

  No EPT (N= 1,176) Past EPT (N= 612) Current EPT (N= 248)   
  N Mean1 SE2 N Mean1 SE2 N Mean1 SE2 P3
Mammographic density (%) 1,176 17.07 0.46 612 18.99 0.45 248 23.34 0.51 0.0001
Age at screening (years) 1,176 58.19 0.18 612 59.22 0.15 248 57.33 0.15 0.0001
Body mass index (kg/m 2 ) 1,176 25.44 0.13 612 24.91 0.10 248 24.15 0.11 0.0001
Age at menarche (years) 1,169 13.16 0.04 607 13.36 0.04 246 13.31 0.04 0.1025
Age at first pregnancy (years) 1,049 21.75 0.25 540 22.3 0.24 225 22.28 0.24 0.3602
Number of children 1,114 2 0.03 587 2 0.03 239 2 0.03 0.7252
Education (years) 1,164 12.75 0.10 605 13.01 0.10 245 12.85 0.10 0.2807
  1. 1Adjusted for age and BMI, 2standard error, 3analysis of variance.