Table 2.
Omission ratea and intrusion rateb within different food categories, listed in descending order from the most to the least frequently observed, for all 8- and 9-year old children (N=117) in a validation study of a Web-based Food Record in Norway.
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Omission rate % |
Intrusion rate % |
Coinciding omissions and intrusionsc |
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Nd | Mean (SD) | Nd | Mean (SD) | Ne | n (%) |
| All food items | 117 | 27 (27) | 117 | 19 (26) | 136 | 18 (13.2) |
| Spreads | 93 | 29 (43) | 79 | 17 (33) | 41 | 7 (17.1) |
| Bread products | 95 | 5 (22) | 97 | 7 (26) | 5 | 3 (60.0) |
| Fruit, berries | 42 | 39 (48) | 36 | 25 (44) | 22 | 1 (4.5) |
| Vegetables, salads | 33 | 45 (49) | 23 | 21 (39) | 23 | 0 (0.0) |
| Milk | 49 | 6 (24) | 52 | 12 (32) | 3 | 1 (33.3) |
| Beverages, otherf | 44 | 18 (39) | 62 | 42 (50) | 8 | 2 (25.0) |
| Dinner leftovers | 17 | 33 (43) | 14 | 7 (27) | 7 | 0 (0.0) |
| Miscellaneous | 17 | 44 (50) | 12 | 21 (40) | 8 | 1 (12.5) |
| Biscuits, buns, waffles, cakes, and candy | 12 | 85 (31) | 4 | 38 (48) | 12 | 1 (8.3) |
| Yogurt | 11 | 64 (50) | 9 | 56 (53) | 7 | 2 (28.6) |
aOmission rate = omissions/observed eaten food items × 100 = omissions/(omissions + matches) × 100. Omission rates were calculated for each participant within the different food categories. Participants who were not observed eating foods within a certain category (eg, “fruit, berries”) were excluded from the analyses for this category, regardless of what was recorded eaten.
bIntrusion rate = intrusions/recorded eaten food items × 100 = intrusions/(intrusions + matches) × 100. Intrusion rates were calculated for each participant within the different food categories. Participants who did not record eating foods within a certain category (eg, “fruit, berries”) were excluded from the analyses for this category, regardless of what was observed eaten.
cCases where a participant had an omission that corresponds to an intrusion, within the same food category and within the same meal. For example, “apple” omitted and “pear” intruded during the same school lunch. Formula used: coinciding omissions and intrusions/omissions × 100.
dNumber of participants included in analyses.
eNumber of food items included in analyses.
fOf all intruded “beverages, other” 96% are drinking water.