Table 2.
Reproducibility of log-transformed energy and nutrients from food frequency questionnaires (FFQs) administered at month 1 (FFQ1) and month 6 (FFQ2) (N = 120).
| Nutrient (Unit) | FFQ1, Mean ± SD | FFQ2, Mean ± SD a | FFQ1/ FFQ2, % a | Same or Adjacent Quartile, % a | Extreme Quartile, % a | Pearson Correlation Coefficient a | ||
|---|---|---|---|---|---|---|---|---|
| Age 0–7 (n = 66) | Age 8–14 (n = 52) | All (n = 118) | ||||||
| Energy (kcal) | 8.06 (0.34) | 7.93 (0.25) | 101.7 | 73.5 | 6.8 | 0.29 | 0.26 | 0.28 |
| Cholesterol (mg) | 6.25 (0.47) | 5.98 (0.38) | 104.4 | 70.9 | 9.4 | 0.37 | 0.08 | 0.25 |
| Macronutrients | ||||||||
| Plasma fatty acids | ||||||||
| Total Monounsaturated Fatty Acids (g) | 3.53 (0.39) | 3.31 (0.30) | 106.6 | 76.9 | 6.8 | 0.27 | 0.39 | 0.31 |
| Total Polyunsaturated Fatty Acids (g) | 3.36 (0.38) | 3.21 (0.31) | 104.8 | 73.5 | 8.5 | 0.22 | 0.11 | 0.17 |
| Other macronutrients | ||||||||
| Animal Protein (g) | 4.42 (0.41) | 4.22 (0.32) | 104.7 | 68.4 | 6.8 | 0.28 | 0.24 | 0.26 |
| Total Carbohydrate (g) | 6.07 (0.36) | 5.96 (0.29) | 101.8 | 70.1 | 5.1 | 0.26 | 0.21 | 0.24 |
| Total Dietary Fiber (g) | 3.60 (0.40) | 3.42 (0.36) | 105.2 | 68.4 | 6.0 | 0.26 | 0.15 | 0.22 |
| Total Fat (g) | 4.67 (0.37) | 4.47 (0.29) | 104.3 | 76.9 | 6.8 | 0.26 | 0.36 | 0.30 |
| Total Protein (g) | 4.85 (0.36) | 4.69 (0.27) | 103.4 | 66.7 | 6.0 | 0.29 | 0.09 | 0.22 |
| Micronutrients | ||||||||
| Carotenoids | ||||||||
| α-Carotene (μg) | 7.46 (0.61) | 7.22 (0.71) | 103.2 | 73.5 | 8.5 | 0.21 | 0.26 | 0.23 |
| β-Carotene (μg) | 9.05 (0.54) | 8.77 (0.58) | 103.3 | 69.2 | 7.7 | 0.25 | 0.35 | 0.27 |
| β-Cryptoxanthin (μg) | 6.61 (0.75) | 6.27 (0.81) | 105.5 | 72.6 | 11.1 | 0.31 | 0.23 | 0.28 |
| Tocopherols | ||||||||
| β-Tocopherol (mg) | −0.38 (0.47) | −0.57 (0.40) | 67.4 | 76.9 | 6.0 | 0.29 | 0.28 | 0.29 |
| δ-Tocopherol (mg) | 2.03 (0.43) | 1.87 (0.40) | 108.3 | 65.8 | 9.4 | 0.08 | 0.04 | 0.06 |
| γ-Tocopherol (mg) | 3.27 (0.41) | 3.11 (0.38) | 105.0 | 66.7 | 10.3 | 0.12 | 0.04 | 0.08 |
| Other micronutrients | ||||||||
| Calcium (mg) | 7.11 (0.38) | 6.93 (0.35) | 102.6 | 66.7 | 6.8 | 0.28 | 0.10 | 0.20 |
| Iron (mg) | 3.16 (0.45) | 3.02 (0.36) | 104.7 | 67.5 | 5.1 | 0.24 | 0.12 | 0.18 |
| Niacin (vitamin B3) (mg) | 3.64 (0.38) | 3.51 (0.30) | 103.7 | 71.8 | 6.0 | 0.33 | 0.11 | 0.28 |
| Retinol (μg) | 6.68 (0.64) | 6.28 (0.66) | 106.4 | 67.5 | 7.7 | 0.44 | −0.02 | 0.23 |
| Riboflavin (vitamin B2) (mg) | 0.99 (0.36) | 0.76 (0.32) | 130.3 | 65.8 | 8.5 | 0.30 | −0.01 | 0.18 |
| Total Folate (μg) | 6.47 (0.37) | 6.31 (0.32) | 102.5 | 65.0 | 4.3 | 0.35 | 0.09 | 0.27 |
| Total Vitamin A Activity (IU) | 9.89 (0.48) | 9.59 (0.50) | 103.1 | 75.2 | 7.7 | 0.28 | 0.35 | 0.29 |
| Total Vitamin A Activity (RAE) (μg) | 7.45 (0.47) | 7.11 (0.48) | 104.8 | 70.1 | 6.0 | 0.37 | 0.21 | 0.31 |
| Total Vitamin A Activity (RE) (μg) | 7.86 (0.46) | 7.54 (0.47) | 104.2 | 74.4 | 7.7 | 0.33 | 0.29 | 0.31 |
| Vitamin C (mg) | 5.48 (0.50) | 5.23 (0.50) | 104.8 | 60.7 | 10.3 | 0.38 | 0.16 | 0.31 |
| Vitamin D (μg) | 2.08 (0.54) | 1.78 (0.30) | 117.1 | 75.2 | 9.4 | 0.31 | 0.08 | 0.22 |
| Vitamin E (mg) | 2.57 (0.40) | 2.32 (0.32) | 110.8 | 70.9 | 6.0 | 0.33 | 0.21 | 0.28 |
| Zinc (mg) | 2.72 (0.37) | 2.58 (0.30) | 105.5 | 64.1 | 6.0 | 0.28 | 0.07 | 0.19 |
a n = 118. Abbreviations: standard deviation (SD), milligram (mg), microgram (μg), gram (g), international units (IU), kilocalories (kcal), retinol activity equivalents (RAE), retinol equivalents (RE).