Table 4.
Bland–Altman analysis of nutrients between the FFQ and 7-day food diary.
| Nutrient | Bias * | SD | 95% CI |
|---|---|---|---|
| Protein (g) | 9.45 | 10.21 | −12.67, 26.55 |
| Minerals (g) | 1.53 | 2.17 | −2.03, 6.11 |
| Fibre (g) | 5.21 | 3.22 | −2.53, 5.34 |
| Carbohydrate (g) | 35.15 | 12.3 | −34.22, 172 |
| Energy (kcal) | n.a. | n.a. | n.a. |
| Calcium (mg) | 34.14 | 22.5 | −56.3, 102.4 |
| Phosphorous (mg) | 81.4 | 34.6 | −78.4, 140 |
| Fat (g) | 18.93 | 10.45 | −37.21, 91.39 |
| Riboflavin (mg) | 1.55 | 0.463 | −0.15, 1.32 |
| Chloride (mg) | 13.45 | 21.43 | −45.22, 73.7 |
| Sulfur (mg) | 11.32 | 31.45 | −52.14, 78.2 |
| Magnesium (mg) | 71.42 | 96.43 | −123.4, 221 |
| Choline (mg) | 82.32 | 65.4 | −115.1,198.3 |
| Vitamin C (mg) | 18.23 | 21.43 | −78.14, 119.56 |
| Thiamine (mg) | 0.13 | 0.14 | −0.221, 0.62 |
| Iron (mg) | 4.14 | 5.33 | −1.35, 8.44 |
| Niacin (mg) | 2.33 | 4.13 | −3.332, 8.33 |
| Carotene (μg) | 43.15 | 11.33 | −341, 1555 |
| B6 (mg) | 1.14 | 1.16 | −1.228, 2.11 |
| Folic acid (μg) | 10.98 | 11.84 | −31.14, 51.66 |
| Sodium (mg) | 20.82 | 31.32 | −83.33, 145.8 |
| Potassium (mg) | 180.6 | 146.9 | −255.6, 612.5 |
| Copper (mg) | −1.44 | 21.54 | −214.31, 114.14 |
| Manganese (mg) | 0.94 | 1.22 | −0.14, 2.11 |
| Molybdenum (mg) | 0.16 | 0.56 | −0.65, 0.53 |
| Zinc (mg) | −2.33 | 1.53 | −11.66, 4.78 |
| Chromium (mg) | 0.093 | 0.12 | −0.16, 1.32 |
Analysis performed on energy-adjusted nutrient intake; SD, standard deviation; CI, Confidence interval; n.a., not applicable. * Positive differences in the average discrepancy between the two methods indicate an overestimation of nutrient intake by the FFQ.