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Table 1 Characteristics at baseline of study population stratified by menopausal status

From: Predictors of mammographic density among women with a strong family history of breast cancer

Characteristic Premenopausal Women
N = 97
Postmenopausal Women
N = 59
Age at questionnaire, mean (range) 43.3 (27.0-58.3) 56.6 (43.2-68.3)
Age at mammogram, mean (range) 43.9 (29.2-59.0) 56.5 (41.8-68.2)
Years between questionnaire and mammogram, mean (range) 0.9 (0-5.6) 0.6 (0-2.0)
Percent Density (%), mean (range) 27.5 (0.2-79.7) 14.0 (0.7-58.3)
Dense Area (cm2), mean (range) 33.2 (0.6-152.8) 18.4 (1.6-111.8)
Non-Dense Area (cm2), mean (range) 116.1 (16.6-496.1) 143.0 (50.7-348.5)
Height (cm), mean (range) 166.5 (149.9-188.0) 164.0 (152.0-175.3)
BMI (kg/m2), mean (range)
 Current 25.8 (18.0-48.0) 26.7 (18.4-42.0)
 At 18 years 21.4 (15.7-44.3) 20.4 (16.9-26.6)
 At 30 years 23.7 (18.0-46.3) 22.3 (17.7-34.9)
 At 40 years 24.3 (18.8-42.9) 24.2 (17.7-38.6)
 Greatest BMI 27.2 (18.3-49.6) 28.5 (20.6-42.0)
Age at menarche, mean (range) 12.8 (8.0-16.0) 13.1 (11.0-16.0)
Parity1, n (%) 71 (73) 46 (77)
Nulliparous 26 (27) 14 (23)
1 21 (30) 6 (13)
2 35 (49) 22 (48)
≥3 15 (21) 18 (39)
Mean (range) 1.9 (1-3) 2.3 (1-4)
Age at first birth, mean (range) 30.2 (18.0-42.0) 25.5 (15.0-37.0)
Breastfeeding, mean months (range)2 15.1 (0-87) 9.3 (0-39)
Age at menopause,3 mean (range) N/A 46.4 (26-56)
Hormone therapy use, n (%)3
 Never N/A 43 (73)
 Ever 16 (27)
 Years of HRT use, mean (range) 6.8 (0.3-23.0)
Oral contraceptive use, n (%)
 Never 10 (10) 5 (9)
 Ever 87 (90) 53 (91)
 Missing 0 1 (2)
 Years of OC use, mean (range) 9.6 (0.5-34.0) 9.6 (0.08-30.0)
Alcohol use, n (%)
 Never 10 (10) 5 (8)
 Ever 87 (90) 55 (92)
 Current 73 (79) 46 (84)
 Drinks consumed per week, mean (range) 3.9 (2-15) 4.7 (2-20)
 Age of initiation, mean (range) 18.2 (14.0-30.0) 18.8 (13.0-40.0)
Smoking history, n (%)
 Never 64 (66) 30 (51)
 Ever 33 (34) 29 (49)
 Current 7 (20) 7 (22)
 Number of packs smoked per week, mean (range) 2.8 (1-7) 4.2 (1-9)
 Age of initiation, mean (range) 17.4 (13.0-29.0) 16.1 (11.0-23.0)
Physical Activity Within the last year
 Total physical activity MET4-hours per week, mean (range) 36.2 (0-162.6) 30.5 (0-211.0)
 MVPA5 MET-hours per week, mean (range) 23.3 (0-147.6) 19.1 (0-141.0)
  1. 1Parity includes live births only
  2. 2Among parous women only
  3. 3Among postmenopausal women only
  4. 4Metabolic Equivalent of Task. Includes walking and moderate and vigorous physical activity
  5. 5Moderate to vigorous physical activity