Table 3.
Relative validity of the FFeQ for nutrients (n=92). Means and cross-classification were computed on crudes variables. All variables were log transformed before computing Pearson correlation coefficients to improve normality.
| Nutrients | Daily intakes | FFeQ2 vs mean of three to six 24-hour recalls | |||||||
|
|
24-hour recalls, median (IQR) | FFeQ2, median (IQR) | FFeQ2-24-hour recalls, mean (SD) | Pearson correlation coefficientsa | Cross-classification of nutrient distribution, % | ||||
|
|
Unadjusted | Energy-adjustedb | Deattenuatedc | Subjects classified in same or adjacent quintile | Subjects classified in opposite quintiles | ||||
| Energy (kcal) | 1882.2 (659.6) | 1859.5 (819.8) | -77.4 (565.3) | 0.47 | N/Ad | 0.50e | 66 | 3 | |
| Protein (g) | 76.2 (22.6) | 72.2 (34.1) | -3.5 (23.6) | 0.57 | 0.47 | 0.52 | 72 | 2 | |
| Carbohydrates (g) | 203.7 (74.6) | 202.3 (98.0) | -1.3 (72.6) | 0.44 | 0.49 | 0.54 | 71 | 3 | |
| Fat (g) | 74.2 (28.4) | 67.7 (34.8) | -3.6 (27.2) | 0.47 | 0.55 | 0.61 | 59 | 3 | |
| SFAf (g) | 26.9 (13.9) | 25.8 (14.2) | -2.4g (10.5) | 0.61 | 0.54 | 0.61 | 67 | 1 | |
| MUFAh (g) | 24.2 (10.4) | 26.3 (12.0) | 3.1g (12.2) | 0.35 | 0.46 | 0.53 | 58 | 7 | |
| PUFAi (g) | 8.6 (3.7) | 7.8 (3.6) | -0.1 (4.5) | 0.32 | 0.48 | 0.55 | 58 | 4 | |
| Cholesterol (mg) | 244.2 (133.6) | 243.3 (130.2) | -11.4 (149.9) | 0.46 | 0.31 | 0.39 | 65 | 5 | |
| Sugars (g) | 79.8 (34.3) | 82.5 (46.2) | 3.6 (42.9) | 0.28 | 0.39 | 0.45 | 71 | 8 | |
| Fiber (g) | 21.6 (9.0) | 20.9 (9.3) | -0.7 (7.9) | 0.40 | 0.52 | 0.60 | 64 | 3 | |
| Alcohol (g) | 4.7 (14.0) | 2.0 (6.9) | -3.5g (8.5) | 0.77j | —k | —k | 88 | 1 | |
| Water (g) | 2736.5 (868.5) | 3182.4 (1744.0) | 1310.8g (2654.0) | 0.47 | 0.47 | 0.51 | 68 | 1 | |
| Sodium (mg) | 2463.5 (1072.0) | 2376.7 (945.7) | -402.5g (1483.9) | 0.37 | 0.05 | 0.07 | 64 | 1 | |
| Magnesium (mg) | 319.1 (104.6) | 344.0 (194.9) | 52.0g (142.4) | 0.26 | 0.25 | 0.29 | 62 | 8 | |
| Phosphorus (mg) | 1139.6 (334.3) | 1114.7 (491.7) | 1.6g (352.8) | 0.50 | 0.40 | 0.45 | 67 | 2 | |
| Potassium (mg) | 3099.1 (1044.0) | 3091.6 (1555.0) | 133.1 (955.3) | 0.49 | 0.59 | 0.68 | 71 | 2 | |
| Calcium (mg) | 853.4 (322.5) | 1113.7 (625.1) | 442.2g (553.1) | 0.42 | 0.38 | 0.44 | 70 | 5 | |
| Manganese (mg) | 2.8 (1.5) | 11.5 (6.5) | 9.3g (4.9) | 0.08 | 0.05 | 0.05 | 59 | 8 | |
| Iron (mg) | 9.4 (4.3) | 10.6 (5.0) | 1.1g (4.5) | 0.28 | 0.23 | 0.27 | 62 | 3 | |
| Copper (mg) | 1.4 (0.6) | 2.2 (1.5) | 0.8g (1.6) | 0.08 | 0.06 | 0.07 | 57 | 7 | |
| Zinc (mg) | 8.6 (2.9) | 9.1 (4.7) | 0.4 (5.0) | 0.40 | 0.22 | 0.26 | 61 | 1 | |
| Iodine (μg) | 120.2 (68.5) | 122.1 (57.2) | -3.6 (69.1) | 0.43 | 0.24 | 0.29 | 68 | 2 | |
| Retinol (μg) | 0.0 (0.0) | 383.3 (393.4) | 506.6g (479.8) | 0.11j | —k | —k | 41 | 18 | |
| Carotene (μg) | 3298.9 (2559.0) | 3165.6 (2944.0) | -306.4 (2833.2) | 0.52 | 0.54 | 0.68 | 77 | 3 | |
| Vitamin D (μg) | 2.2 (1.5) | 2.1 (1.2) | -0.4 (1.9) | 0.32 | 0.23 | 0.31 | 61 | 3 |
|
| Vitamin E (mg) | 9.0 (4.3) | 10.2 (5.1) | 2.1g (5.4) | 0.25 | 0.43 | 0.53 | 58 | 4 | |
| Vitamin C (mg) | 118.6 (69.7) | 124.7 (90.3) | 13.3 (68.5) | 0.54 | 0.56 | 0.68 | 78 | 2 | |
| Vitamin B1 (mg) | 1.1 (0.4) | 1.0 (0.4) | -0.1g (0.4) | 0.31 | 0.33 | 0.41 | 66 | 4 | |
| Vitamin B2 (mg) | 1.6 (0.6) | 1.5 (0.8) | 0.0 (0.6) | 0.45 | 0.48 | 0.53 | 68 | 1 | |
| Vitamin B3 (mg) | 16.5 (6.8) | 15.6 (8.9) | 0.0 (6.7) | 0.49 | 0.49 | 0.58 | 73 | 4 | |
| Vitamin B5 (mg) | 4.8 (2.0) | 4.8 (2.4) | 0.2 (1.8) | 0.47 | 0.57 | 0.64 | 70 | 1 | |
| Vitamin B6 (mg) | 1.7 (0.7) | 1.6 (0.6) | -0.1 (0.7) | 0.28 | 0.38 | 0.46 | 58 | 2 |
|
| Vitamin B9 (μg) | 305.1 (115.1) | 321.0 (141.0) | 26.9 (126.0) | 0.36 | 0.49 | 0.58 | 64 | 1 | |
| Vitamin B12 (μg) | 3.3 (2.3) | 5.6 (3.8) | 2.1g (6.0) | 0.31 | 0.21 | 0.26 | 65 | 7 | |
aThe statistical tests provided P values <.05 for each Pearson correlation coefficient, except for those in italics.
bEnergy adjustment according to the residual method.
cEnergy-adjusted and deattenuated Pearson correlation coefficient (corrected for within-person variation in the three to six 24-hour recalls).
dN/A: not applicable
eUnadjusted and de-attenuated Pearson correlation coefficient.
fSFA: saturated fatty acids.
gThe mean rank of the values of the three to six 24-hr recalls was significantly different to the mean rank of the values of the SFFeQ, according to Wilcoxon signed rank tests. The statistical tests provided P values <.05 for each Pearson correlation coefficient, except for those in italics.
hMUFA: monounsaturated fatty acids.
iPUFA: polyunsaturated fatty acids.
jSpearman correlation coefficients were performed because normality was not respected.
kNormality was not respected. Energy-adjusted and deattenuated coefficients were not performed.