Table 1.

Selected variables that describe the study population

		Cases		Controls
Variable	Category	N	%	N	%
Cruciferous Vegetables1
	<1 serving per week	50	16.1	77	12.4
	1 serving per week	97	31.2	170	27.3
	2–3 servings per week	78	25.1	178	28.6
	4+ servings per week	86	27.7	197	31.7
Dietary Isothiocyanates
	≤ 25 μMol	91	29.3	146	23.5
	26 – 40 μMol	66	21.2	121	19.5
	41 – 80 μMol	74	23.8	173	27.8
	> 80 μMol	80	25.7	182	29.3
GSTM1
	wild type	184	59.2	346	55.6
	homozygous null	127	40.8	276	44.4
Race
	Caucasian (non Hispanic White)	172	55.3	424	68.2
	African American	139	44.7	198	31.8
Sex
	female	130	41.8	205	33.0
	male	181	58.2	417	67.0
Smoking Status
	never smoker	10	3.2	213	34.2
	former smoker	103	33.1	276	44.4
	current smoker	198	63.7	133	21.4
Age in years, mean/median, (SD)		63.52/64.0	(9.38)	62.57/63.0	(8.43)

¹Cruciferous vegetables include broccoli, cabbage, cauliflower, greens, and brussel sprouts