From: Predictors of mammographic density among women with a strong family history of breast cancer
 |  | Premenopausal women (n = 97) | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
 | Percent Density (%) |  | Dense Area (cm2) |  | Non-Dense Area (cm2) | |||||||
n | Mean1 PD | 95% CI1 | P 1 | n | Mean1 DA | 95% CI1 | P 1 | n | Mean1 NDA | 95% CI1 | P 1 | |
Weight | ||||||||||||
 <77.0 kg | 71 | 33.2 | 23.7-44.2 |  | 64 | 35.3 | 22.4-51.1 |  | 64 | 73.2 | 47.6-104.4 |  |
 ≥77.0 kg | 26 | 17.6 | 9.4-28.4 | 0.0006 | 24 | 31.9 | 17.1-51.4 | 0.59 | 24 | 165.2 | 115.9-223.2 | <0.0001 |
Height | ||||||||||||
 <170 cm | 69 | 27.0 | 18.3-37.5 |  | 63 | 32.4 | 19.2-48.9 |  | 63 | 97.7 | 66.5-135.0 |  |
 ≥170 cm | 28 | 33.2 | 23.1-45.1 | 0.18 | 25 | 37.0 | 23.1-54.3 | 0.47 | 25 | 78.6 | 51.3-111.8 | 0.16 |
TWA | ||||||||||||
 <43.0 MET-hrs/week | 69 | 26.4 | 17.1-37.8 |  | 62 | 30.6 | 17.4-47.5 |  | 63 | 94.6 | 63.0-132.6 |  |
 ≥43.0 MET-hrs/week | 28 | 24.1 | 14.6-36.0 | 0.58 | 26 | 29.8 | 15.7-48.2 | 0.88 | 25 | 93.9 | 59.8-135.6 | 0.96 |
MVPA | ||||||||||||
 <27.0 METs/week | 72 | 26.1 | 17.1-37.0 |  | 64 | 30.2 | 17.3-46.6 |  | 64 | 93.9 | 63.0-131.0 |  |
 ≥27.0 METs/week | 25 | 23.6 | 13.6-36.3 | 0.55 | 24 | 30.7 | 16.0-50.1 | 0.93 | 24 | 95.6 | 60.2-139.3 | 0.90 |
Smoking status | ||||||||||||
 Never | 64 | 28.9 | 20.3-39.1 | ref | 58 | 33.5 | 20.8-49.3 | ref | 58 | 89.5 | 61.4-122.9 | ref |
 Former | 26 | 29.3 | 19.3-41.5 | 0.93 | 23 | 36.2 | 21.5-54.8 | 0.68 | 23 | 102.4 | 68.7-142.9 | 0.36 |
 Current smoker | 7 | 18.1 | 6.8-34.9 | 0.14 | 7 | 19.7 | 5.2-43.5 | 0.15 | 7 | 87.7 | 42.3-149.3 | 0.94 |
Age at first use | ||||||||||||
 <16 years | 10 | 19.8 | 7.3-38.3 |  | 10 | 30.0 | 12.3-55.4 |  | 10 | 130.4 | 78.6-195.3 |  |
 ≥16 years | 23 | 28.8 | 14.0-49.0 | 0.15 | 20 | 46.7 | 25.0-75.1 | 0.07 | 20 | 127.9 | 79.8-187.4 | 0.90 |
Packs smoked | ||||||||||||
 <3 packs/week | 20 | 29.2 | 14.4-49.3 |  | 18 | 48.1 | 27.5-74.5 |  | 18 | 125.5 | 78.4-183.6 |  |
 ≥3 packs/week | 13 | 19.5 | 7.3-37.6 | 0.12 | 12 | 25.5 | 10.0-48.2 | 0.01 | 12 | 135.9 | 81.7-203.8 | 0.64 |
Duration of use | ||||||||||||
 <14 years | 16 | 32.2 | 17.4-51.3 |  | 14 | 53.1 | 32.0-79.5 |  | 14 | 126.0 | 77.5-186.3 |  |
 ≥14 years | 17 | 15.8 | 5.6-31.2 | 0.01 | 16 | 25.3 | 11.0-45.5 | 0.002 | 16 | 132.7 | 80.6-197.8 | 0.76 |
Alcohol use | ||||||||||||
 Never | 10 | 29.7 | 17.4-45.1 | ref | 9 | 38.1 | 18.9-63.8 | ref | 9 | 103.3 | 61.0-156.6 | ref |
 Former | 15 | 30.5 | 18.1-46.2 | 0.91 | 15 | 32.8 | 16.4-54.7 | 0.64 | 15 | 79.7 | 45.8-122.9 | 0.31 |
 Current user | 72 | 27.9 | 19.1-38.3 | 0.78 | 64 | 33.8 | 21.0-49.7 | 0.66 | 64 | 96.0 | 67.3-129.7 | 0.73 |
Age at first use | ||||||||||||
 <18 years | 29 | 21.5 | 11.8-34.2 |  | 27 | 28.9 | 15.2-47.0 |  | 27 | 118.8 | 78.4-167.6 |  |
 ≥18 years | 58 | 27.5 | 17.7-39.3 | 0.14 | 52 | 34.3 | 21.0-51.0 | 0.34 | 52 | 90.6 | 60.1-127.4 | 0.05 |
Drinks consumed | ||||||||||||
 <2 drinks/week | 60 | 25.2 | 15.4-37.4 |  | 57 | 33.0 | 19.1-50.7 |  | 57 | 92.5 | 59.0-133.4 |  |
 ≥2 drinks/week | 27 | 27.7 | 17.0-41.1 | 0.58 | 22 | 33.2 | 19.0-51.3 | 0.98 | 22 | 101.1 | 65.3-144.6 | 0.58 |