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