Table 2.

Mean (standard deviation) nutrient intakes of participants in the North Carolina Colon Cancer Study-Phase II (2001–2006), by case/control status and race

Nutrient	Whites (n = 1,520)			African Americans (n = 384)
	Cases (n = 720)	Controls (n = 800)	pa	Cases (n = 225)	Controls (n = 159)	pa	pb
Vitamin C (mg/day)
From foods only	132 (82)	146 (77)	<0.0001	183 (107)	152 (86)	0.003	0.76
From foods + supplements	266 (314)	313 (346)	<0.0001	259 (228)	215 (212)	0.001	0.0004
Vitamin E (mg αTEc/day)
From foods only	11.5 (5.5)	12.0 (6.2)	0.38	11.9 (6.0)	11.1 (5.0)	0.35	0.14
From foods + supplements	79 (133)	103 (153)	0.0003	56 (122)	47 (91)	0.05	<0.0001
β-Carotene (μg/day)
From foods only	3,881 (2,610)	4,595 (3,012)	<0.0001	5,794 (4,637)	5,247 (4,233)	0.31	0.30
From foods + supplements	4,185 (2,712)	4,945 (3,077)	<0.0001	6,042 (4,678)	5,426 (4,277)	0.21	0.75
Selenium (μg/day)
From foods only	104 (41)	105 (43)	0.81	112 (51)	107 (50)	0.42	0.91
From foods + supplements	105 (41)	106 (44)	0.75	112 (50)	108 (49)	0.45	0.94
Folate (μg/day)
From foods only	433 (157)	450 (176)	0.14	483 (206)	432 (177)	0.02	0.20
From foods + supplements	619 (262)	665 (270)	0.002	649 (280)	549 (252)	0.0004	<0.0001
Vitamin B6 (mg/day)
From foods only	2.1 (0.8)	2.2 (0.9)	0.08	2.3 (1.0)	2.1 (0.9)	0.01	0.14
From foods + supplements	4.8 (8.1)	5.6 (9.0)	0.0004	4.3 (5.9)	3.7 (5.9)	0.001	<0.0001
Vitamin B12 (μg/day)
From foods only	5.4 (3.2)	5.7 (3.3)	0.06	6.5 (5.2)	6.2 (4.7)	0.20	0.62
From foods + supplements	8.2 (4.3)	8.8 (4.3)	0.004	9.0 (5.9)	7.9 (5.5)	0.01	0.0004

^aBased on Wilcoxon rank-sum test for comparisons between race-specific cases and controls

^bBased on Wilcoxon rank-sum test for comparisons between white and African American controls

^cα-Tocopherol equivalents