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Table 1

Characteristics of treatment groups at randomizationa

CharacteristicsTamoxifen n = 36Placebo n = 33
Age at baseline (yr) 50.9 ± 8.0 50.3 ± 6.4 
At least one first-degree relative with breast cancer (%) 75 75.8 
History of at least one breast biopsy (%) 52.8 42.4 
Nulliparity (%) 36.1 24.2 
Age at first live birthb (yr) 26.1 ± 4.2 24.6 ± 4.6 
Age at menarche (yr) 12.8 ± 1.6 12.9 ± 1.7 
Body mass index 25.1 ± 3.1 25.3 ± 4.5 
Alcohol consumption (drinks/week)  3.1 ± 4.5  3.9 ± 5.0 
Wolfe’s parenchymal pattern (%)   
N1 or P1  5.6 12.1 
P2 52.8 51.5 
DY 41.7 36.4 
Mean percentage of the breast with mammographic densities 60.3 ± 18.5 60.5 ± 24.2 
Duration of treatment (yr) 3.3 ± 1.5  3.5 ± 1.2 
CharacteristicsTamoxifen n = 36Placebo n = 33
Age at baseline (yr) 50.9 ± 8.0 50.3 ± 6.4 
At least one first-degree relative with breast cancer (%) 75 75.8 
History of at least one breast biopsy (%) 52.8 42.4 
Nulliparity (%) 36.1 24.2 
Age at first live birthb (yr) 26.1 ± 4.2 24.6 ± 4.6 
Age at menarche (yr) 12.8 ± 1.6 12.9 ± 1.7 
Body mass index 25.1 ± 3.1 25.3 ± 4.5 
Alcohol consumption (drinks/week)  3.1 ± 4.5  3.9 ± 5.0 
Wolfe’s parenchymal pattern (%)   
N1 or P1  5.6 12.1 
P2 52.8 51.5 
DY 41.7 36.4 
Mean percentage of the breast with mammographic densities 60.3 ± 18.5 60.5 ± 24.2 
Duration of treatment (yr) 3.3 ± 1.5  3.5 ± 1.2 
a

± values are means ±SD.

b

Among women who had at least one child.

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