Table 3.
Cross-classification of subjects by quartiles of nutrient intakes between the Food Frequency Questionnaire (FFQ) and the 8-day weighted diet record (8dWDR).
| Crude | Energy-Adjusted | |||
|---|---|---|---|---|
| Nutrient | Correct Classification (%) 1 | Gross Misclassification (%) 2 | Correct Classification (%) 1 | Gross Misclassification (%) 2 |
| Energy | 68.2 | 7.4 | - | - |
| Protein | 68.2 | 5.9 | 81.5 | 3.0 |
| Total fat | 72.6 | 7.4 | 85.9 | 3.0 |
| Saturated fat | 76.3 | 6.7 | 88.9 | 3.7 |
| Monounsaturated fat | 72.6 | 8.9 | 73.4 | 4.4 |
| Polyunsaturated fat | 74.8 | 8.2 | 74.8 | 5.9 |
| Cholesterol | 85.9 | 2.2 | 83.7 | 2.2 |
| Carbohydrate | 78.5 | 5.9 | 85.2 | 1.5 |
| Sucrose | 77.1 | 4.4 | 80.0 | 4.4 |
| Fructose | 82.2 | 3.0 | 81.5 | 1.5 |
| Fibre | 79.3 | 5.2 | 85.2 | 3.0 |
| Alcohol | 98.5 | 0.0 | 95.7 | 0.0 |
| Total vitamin A | 76.3 | 7.4 | 77.1 | 5.2 |
| β-carotene | 73.4 | 6.7 | 78.5 | 5.2 |
| Thiamin | 77.1 | 7.4 | 76.3 | 6.7 |
| Riboflavin | 77.8 | 3.0 | 83.7 | 4.4 |
| Niacin equivalents | 68.2 | 8.9 | 68.9 | 2.2 |
| Vitamin B6 | 74.1 | 6.7 | 82.2 | 3.7 |
| Folate | 77.1 | 3.7 | 81.5 | 3.0 |
| Vitamin B12 | 81.5 | 4.4 | 85.2 | 5.9 |
| Vitamin C | 76.3 | 4.4 | 80.0 | 3.0 |
| Vitamin E | 77.1 | 7.4 | 75.6 | 6.7 |
| Calcium | 80.8 | 0.7 | 83.0 | 3.7 |
| Potassium | 74.1 | 5.2 | 81.5 | 1.5 |
| Iron | 70.4 | 7.4 | 76.3 | 3.7 |
| Selenium | 77.0 | 5.9 | 77.1 | 5.9 |
| Sodium | 76.3 | 9.6 | 72.6 | 6.7 |
| Magnesium | 72.6 | 4.4 | 78.5 | 2.2 |
| Zinc | 66.7 | 8.1 | 77.8 | 4.4 |
1 Percentage of participants classified into the same or adjacent fourth of nutrient intake (intake from supplements not included).2 Percentage of participants classified into the extreme fourth of nutrient intake (intake from supplements not included).