BMC Public Health

Table 4 Medians and Pearson correlation coefficients for three week-12 diet recalls and three week-28 diet recalls ^a

From: Use of a food frequency questionnaire in American Indian and Caucasian pregnant women: a validation study

	Overall			By ethnicity		By poverty level
	All participants			American Indian	Caucasian	≤ 100%	101–185%
Nutrient	Median of week-12 recalls	Median of week-28 recalls	Adjusted r ^b	Adjusted r ^b	Adjusted r ^b	Adjusted r ^b	Adjusted r ^b
Calories (kcal)	2122	2084	NA	NA	NA	NA	NA
Carbohydrates (g)	282	281	0.28	0.30	0.26	0.30	0.22
Protein (g)	81	78	0.26	0.24	0.29	0.25	0.30
Dietary fiber (g)	14	14	0.42	0.21	0.49	0.39	0.44
Total fat (g)	78	76	0.33	0.20	0.38	0.32	0.38
Saturated fat (g)	28	28	0.46	0.36	0.49	0.46	0.48
Mono unsaturated fat (g)	30	28	0.31	0.21	0.34	0.31	0.31
Poly unsaturated fat (g)	14	13	0.05	0.02	0.09	0.06	0.05
Omega 3 fatty acids (g)	0.02	0.02	-0.02	-0.002	-0.02	-0.11	0.13
Percent energy from fat	33	33	NA	NA	NA	NA	NA
Cholesterol	241	234	0.37	0.42	0.24	0.38	0.36
Sucrose	39	44	0.42	0.54	0.36	0.39	0.47
Calcium	1302	1278	0.51	0.47	0.48	0.45	0.59
Iron (mg)	62	70	0.46	0.38	0.54	0.44	0.53
Magnesium (mg)	276	276	0.48	0.33	0.54	0.47	0.48
Phosphorus (mg)	1487	1422	0.40	0.34	0.40	0.35	0.45
Zinc (mg)	32	32	0.43	0.33	0.51	0.41	0.46
Vitamin A (IU)	8515	9275	0.20	0.37	0.09	0.17	0.26
Vitamin E (mg)	16	16	0.35	0.21	0.44	0.37	0.32
Vitamin C (mg)	179	184	0.37	0.34	0.41	0.43	0.25
Vitamin B1 (mg)	3	3	0.29	0.31	0.27	0.38	0.16
Vitamin B2 (mg)	4	4	0.27	0.35	0.18	0.34	0.16
Niacin (mg)	37	36	0.38	0.35	0.39	0.39	0.39
Folate (mcg)	968	950	0.38	0.32	0.45	0.38	0.42
Vitamin B6 (mg)	4	4	0.27	0.34	0.20	0.37	0.13
Vitamin B12 (mcg)	8	8	0.26	0.16	0.27	0.25	0.28
	Average correlation:		0.33	0.30	0.34	0.33	0.33

SD, standard deviation; CI, confidence interval
^a Excluded if calories > 4500 (n = 5) or age < 16 (n = 3) on the HSFFQ2 or HSFFQ3 (n = 237)
^b Adjusted for total energy intake

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