Table 3.

Means and proportions for baseline characteristics of the SWHS cohort by quartiles of nitrate and nitrite intake (N = 73,317)

		Nitrate				Nitrite
Parameter	Characteristics	Q1	Q3	Q3	Q4	Q1	Q2	Q3	Q4
Energy adjusted quintile median mg/1000kcal		108.6	164.2	217.6	250.9	0.62	0.81	0.95	1.12
Unadjusted quintile median mg/day		165.8	257.8	350.6	506.8	0.89	1.27	1.61	2.14
Age (mean)		53	51.7	51.5	51.9	53.9	51.8	51.2	51.1
Positive family history of cancer (%)		24.5	25.6	25.3	25.7	25.7	25.4	26.1	26.4
Currently married (%)		87.9	90	90.1	87.3	85.6	89.5	90.7	89.5
Body mass index (kg/m2)		23.1	23.3	23.5	23.9	23.2	23.3	23.4	23.8
Smoking history	Ever smoker (%)	3.8	2.5	2.2	2.6	4.4	2.5	1.8	2.4
Education, highschool or more (%)		26.3	19.7	18.8	20.7	34	20.3	16.5	14.7
Vigorous physical energy expend		8.2	8	8	8.1	8.7	8	7.9	7.8
Dietary Intakes	Energy (kcal/day)	1491.5	1625.5	1726.2	1897.3	1398.6	1587.9	1734.4	2019.7
	Vegetables (servings/1,000kcal)	13	13.6	13.8	14.2	13.5	13.6	13.7	13.8
	Cruciferous Vegetables (g/1,000kcal)	23.5	41.7	60.5	103.3	45.9	51.8	58.6	72.6
	Fruit (servings/1,000kcal)	4.4	5.4	5.9	6.6	3.5	5.2	6.2	7.4
	Salted preserved meat (servings/1,000kcal)	0.79	0.86	0.87	0.87	0.6	0.75	0.84	1.19
	Smoked meat/bacon (servings/1,000kcal)	0.34	0.41	0.4	0.41	0.18	0.31	0.4	0.68
	Meat (g/1,000kcal)	29.8	30.7	30	27.8	29.3	31	30.2	27.8
	Fat (g/1,000kcal)	16.5	17.4	17.4	17.8	15.1	17.3	18	18.8
	Fiber (g/1,000kcal)	4.9	9.4	11.1	14.6	7.8	9.3	11.2	15
	Protein (g/1,000kcal)	37.1	39.2	40.4	42.2	36	39.3	40.8	42.8
	Iron (mg/1,000kcal)	9.7	10.6	11.3	12.6	9.9	10.7	11.3	12.3
	Vitamin C (mg/1,000kcal)	48.2	75.5	99.9	151.3	56.3	77.8	99.3	144.3
	Vitamin E (mg/1,000kcal)	8.3	10.7	12.7	16.6	7.9	10.2	12.7	18.2
	Carotene (mg/1,000kcal)	837	1305	1729	2623	1157	1445	1705	2188
	Folic acid (mg/1,000kcal)	142	162	179	211	146	166	179	204