Table 2.

Association between alcohol intake and breast cancer risk in Washington County, Maryland

Alcohol Intake	Cases N = 321	Median (grams/week) (10^th, 90^th ,pctile¹)	Controls N= 321	Median (grams/week) (10^th, 90^th ,pctile¹)	Adj. O.R.², 95% CI³
Total
Non-drinkers	167	0	187	0	1.00 (ref)
Drinkers	95	13.0 (4.5, 135.9)	76	18.0 (4.5, 104.1)	1.40 (0.97,2.03)
Missing	59		58
Pre-menopausal at BC⁴ diagnosis
Non-drinkers	26	0	35	0	1.00 (ref.)
Drinkers	15	6.5 (4.5, 106.8)	9	17.5 (4.5, 52.8)	2.69 (1.00,7.26)
Missing	9		8
Post-menopausal at BC⁴ diagnosis
Non-drinkers	141	0	152	0	1.00 (ref.)
Drinkers	80	13.0 (4.5, 139.1)	67	18.5 (4.5, 166.3)	1.25 (0.84,1.87)
Missing	50		50
					P interaction = 0.16
Estrogen receptor⁵ negative
Non-drinkers	25	0	30	0	1.00 (ref.)
Drinkers	19	11.0 (4.5, 105.8)	14	12.8 (4.5, 102.5)	1.84 (0.75,4.51)
Missing
Estrogen receptor positive
Non-drinkers	112	0	129	0	1.00 (ref.)
Drinkers	64	14.8 (4.5, 142.3)	48	23.5 (4.5, 174.1)	1.47 (0.93, 2.31)
Missing
					P interaction = 0.75

pctile = percentile.

O.R. = Odds ratios, adjusted for matching factors (baseline menopausal status and age).

CI = Confidence Interval.

⁴

BC = breast cancer; women ≤ 51 were categorized as pre-menopausal and women > 51 as post-menopausal in women in whom menopausal status at diagnosis was unknown; 51 cases and controls missing information on estrogen receptor status and therefore the cases and controls do not add up to 321.