Table 6.
Cross classification of subjects by quintiles of calculated intake of nutrients and foods from the food frequency questionnaire (FFQ) and the food diary (FD)
| Absolute intake (g day−1) | Energy‐adjusted intake (g per 10 MJ) | |||
|---|---|---|---|---|
| Correctly classified (%) | Grossly misclassified (%) | Correctly classified (%) | Grossly misclassified (%) | |
| Nutrients* | ||||
| Energy | 66 | 13 | ||
| Protein | 62 | 13 | 71 | 6 |
| Fat | 61 | 17 | 61 | 4 |
| Carbohydrate | 67 | 13 | 62 | 8 |
| Added sugar | 65 | 6 | 57 | 9 |
| Dietary fibre | 67 | 13 | 76 | 9 |
| Beta‐carotene | 66 | 13 | 65 | 6 |
| Retinol | 68 | 13 | 63 | 13 |
| Vitamin D | 71 | 0 | 72 | 0 |
| Vitamin E | 73 | 6 | 74 | 4 |
| Thiamine | 76 | 4 | 77 | 8 |
| Riboflavine | 68 | 4 | 69 | 6 |
| Niacin equivalents | 70 | 4 | 69 | 4 |
| Vitamin B6 | 74 | 6 | 76 | 6 |
| Folate | 61 | 4 | 67 | 2 |
| Vitamin C | 59 | 17 | 62 | 11 |
| Calcium | 69 | 13 | 66 | 13 |
| Phosphorous | 71 | 8 | 71 | 6 |
| Potassium | 70 | 4 | 61 | 3 |
| Magnesium | 70 | 2 | 68 | 11 |
| Iron | 66 | 9 | 66 | 15 |
| Zinc | 71 | 11 | 74 | 13 |
| Copper | 68 | 9 | 66 | 6 |
| Iodine | 67 | 2 | 68 | 6 |
| Selenium | 64 | 6 | 63 | 15 |
| Food groups | ||||
| Dairy foods | 72 | 0 | 75 | 0 |
| All breads | 65 | 6 | 64 | 11 |
| Meat | 64 | 6 | 59 | 4 |
| Fish † and seafood ‡ | 66 | 6 | 73 | 4 |
| Fruit | 66 | 6 | 60 | 4 |
| Juice | 71 | 6 | 78 | 11 |
| Vegetables § | 61 | 4 | 67 | 4 |
| Chocolate/sweets | 63 | 8 | 70 | 6 |
| Soft drinks ¶ | 72 | 11 | 73 | 8 |
| Tea** | 77 | 11 | 76 | 9 |
| Coffee | 94 | 0 | 94 | 2 |
Correctly classified if classified into same or adjacent quintiles, grossly misclassified if classified into opposing quintiles (n = 119). *Food and supplements. †Fish in mixed dishes not included (fish soup, fish au gratin, fish wok, fish pudding). ‡Roe, crabs, scallops, prawns. §All vegetables except potatoes. ¶Including both sugar sweetened and artificial sweetened.**Black, green and herb tea.