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Table 1 Characteristics of all the study population and stratified by BMI

From: Physical activity and mammographic density in a cohort of postmenopausal Norwegian women; a cross-sectional study

VARIABLES ALL In strata of BMI
   < 25 ≥ 25-29 ≥ 30
  N = 2218 N = 1235 N = 732 N = 251
mean (± SD) mean (± SD) mean (± SD) mean (± SD)
Age (yrs) 58.4 (± 5.3) 58.4 (± 5.1) 58.2 (± 5.2) 58.8 (± 5.2)
Education (yrs) 12.8 (± 3.3) 13.5 (± 3.2) 12.8 (± 3.2) 12.1 (± 3.2)
BMI 24.6 (± 4.6) 21.8 (± 1.8) 26.5 (± 1.4) 32.7 (± 3.4)
Number of pregnancies 2.5 (± 1.2) 2.4 (± 1.2) 2.5 (± 1.2) 2.6 (± 1.3)
Age at first full-term pregnancy (yrs) 22.1 (± 7.5) 22.1 (± 8.5) 22.1 (± 7.7) 21.8 (± 7.6)
Postmenopausal HT* 51% 54% 60% 50%
Percent density (%) 18.2 (± 15.9) 26.2 (± 17.7) 18.8 (± 14.2) 10.7 (± 11.5)
Absolute density (cm 2 ) 23.5 (± 20.9) 26.6 (± 18.8) 24.8 (± 20.9) 19.3 (± 22.0)
Physical activity (mins/week) 288 (± 235) 318 (± 250) 266 (± 217) 201 (± 172)
  1. *Percentage of women taking hormone therapy.