Alcohol consumption, endogenous estrogen and mammographic density among premenopausal women

Breast Cancer Research

Table 2 Multivariable adjusted means of mammographic density measures by alcohol consumption by long-term, past-year, and current consumption in premenopausal women (n = 202)^a

Alcohol consumption^b	Number	Percent density (%)	Absolute density (cm²)
Long-term, average^c
Never/rarely	7	32.14 (21.44, 42.84)	36.66 (20.17, 53.15)
1–4 drinks/month	134	26.74 (24.30, 29.17)	31.02 (27.27, 34.77)
>1 drinks/week	43	33.67 (29.27, 38.11)	42.08 (35.27, 48.89)
p-linear trend		0.051	0.029
Past year, average^d
<1 drinks/week	66	28.71 (25.23, 32.20)	31.26 (25.89, 36.64)
1–6 drinks/week	95	27.52 (24.73, 30.31)	32.17 (27.87, 36.48)
≥7 drinks/week	40	36.42 (32.02, 40.83)	46.17 (39.39, 52.95)
p-linear trend		0.003	0.001
Current, past week^e
<1 drink/day	143	28.11 (25.79, 30.42)	33.08 (29.46, 36.69)
≥1 drink/day	58	33.57 (29.87, 37.28)	40.38 (32.78, 44.35)
p-difference		0.016	0.121

Data presented as mean (95 % confidence interval). All analyses have used multivariate linear models
FFQ food frequency questionnaire
Adjusted for age (continuous), body mass index (continuous), number of children (continuous), previous oral contraceptives (categorical), and current smokers (categorical)
^aNumbers may vary owing to missing information
^bOne drink or unit is equal to 10 g alcohol
^cAlcohol consumption reported from age 15 to present time, FFQ
^dAlcohol consumption reported in past year, FFQ
^eAlcohol consumption reported in last 7 days representing 1 week, food diary

ISSN: 1465-542X