Table 3. Recent alcohol consumption and breast cancer risk among AA women in WCHS.

			OR1		OR2
	Cases (n)	Controls (n)	Estimate	95% CI	Estimate	95% CI
Total ethanol from recent alcohol intake
Non-drinker	503	531	Ref		Ref
Drinker	300	357	0.98	0.79–1.20	0.95	0.77–1.17
<14 g per week	131	153	Ref		Ref
14−<28 g per week	60	70	1.00	0.64–1.56	0.98	0.63–1.53
⩾28 g per week	109	134	1.01	0.70–1.46	0.95	0.65–1.39
P for linear trend			0.97		0.80
Ethanol from recent beer intake
Non-beer drinker	684	725	Ref		Ref
Beer drinker	117	163	0.84	0.64–1.10	0.81	0.62–1.06
<14 g per week	69	92	Ref		Ref
14−<28 g per week	22	21	1.65	0.78–3.51	1.67	0.79–3.57
⩾28 g per week	26	50	0.77	0.41–1.45	0.79	0.41–1.49
P for linear trend			0.30		0.31
Ethanol from recent wine intake
Non-wine drinker	587	637	Ref		Ref
Wine drinker	216	251	0.98	0.78–1.23	0.94	0.75–1.19
<14 g per week	109	126	Ref		Ref
14−<28 g per week	50	69	0.87	0.54–1.40	0.85	0.53–1.38
⩾28 g per week	57	56	1.16	0.71–1.88	1.10	0.67–1.80
P for linear trend			0.45		0.58
Ethanol from recent liquor/mixed drinks intake
Non-liquor drinker	637	691	Ref		Ref
Liquor drinker	166	197	1.08	0.84–1.38	1.06	0.83–1.36
<14 g per week	109	146	Ref		Ref
14−<28 g per week	21	19	1.54	0.75–3.16	1.50	0.73–3.08
⩾28 g per week	36	32	1.57	0.88–2.81	1.53	0.84–2.79
P for linear trend			0.13		0.16

Abbreviations: AA= African-American; BMI=body mass index; CI=confidence interval; HRT= hormone replacement therapy; OC=oral contraceptive; OR=odds ratio; WCHS=Women's Circle of Health Study.

OR1: adjusted for age, ethnicity, country of origin, education, age at menarche, parity, age at first birth, breastfeeding status, menopausal status, family history of breast cancer, HRT use, OC use, history of benign breast disease.

OR2: further adjusted for total energy intake and BMI.

Recent alcohol consumption is measured as alcohol consumption during the 12 months before reference date for cases and controls.