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) |