Table 4.
Estimated intakes of energy and energy providing nutrients from the first (WebFFQ1) and second (WebFFQ2) administration of the WebFFQ, in The Reproducibility Study, n=164
| WebFFQ1 |
WebFFQ2 |
pa | Difference, %b |
rc | Cross-classification |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mean | 95% CI | Mean | 95% CI | Mean | 95% CI | exact | exact + adj. | Miscl.d | ||||
| Absolute intakes | ||||||||||||
| Energy, MJ/day | 11.0 | 10.4, 11.7 | 10.2 | 9.6, 10.8 | 0.001 | 3.5 | -1.2, 8.2 | 0.74 | 56 | 90 | 1 | |
| Protein, g/day | 114 | 107, 121 | 104 | 98, 109 | <0.001 | 5.5 | 1.4, 9.6 | 0.74 | 55 | 94 | 1 | |
| Fat, g/day | 112 | 104, 120 | 105 | 97, 112 | 0.02 | 2.7 | -2.7, 8.2 | 0.74 | 56 | 93 | 1 | |
| Saturated fat, g/day | 37 | 34, 39 | 34 | 32, 37 | 0.02 | 2.1 | -3.7, 7.9 | 0.67 | 54 | 92 | 0 | |
| Mono-unsat. fat, g/day | 43 | 39, 46 | 40 | 37, 43 | 0.02 | 2.3 | -3.4, 7.9 | 0.79 | 59 | 93 | 1 | |
| Poly-unsat. fat, g/day | 22 | 20, 24 | 21 | 19, 23 | 0.03 | 1.9 | -4.3, 8.3 | 0.79 | 60 | 93 | 1 | |
| Omega 3, g/day | 7 | 6, 8 | 7 | 6, 8 | 0.06 | 2.3 | -3.6, 8.2 | 0.90 | 59 | 96 | 0 | |
| Carbohydrates, g/day | 263 | 246, 280 | 244 | 228, 260 | 0.002 | 1.8 | -3.7, 7.3 | 0.75 | 56 | 93 | 1 | |
| Sugar, g/day | 33 | 29, 37 | 30 | 27, 33 | 0.08 | -6.8 | -17.4, 3.7 | 0.66 | 59 | 93 | 3 | |
| Fiber, g/day | 36 | 33, 39 | 34 | 31, 36 | 0.007 | 1.6 | -4.4, 7.6 | 0.78 | 51 | 88 | 1 | |
| Alcohol, g/daye | 5 | 1 to 9 | 4 | 1 –to 9 | 0.14 | -5.7 | -16.0, 4.7 | 0.89 | 68 | 96 | 0 | |
| Energy percent, E% | ||||||||||||
| Protein | 17.9 | 17.4, 18.4 | 17.6 | 17.1, 18.1 | 0.10 | 5.5 | 1.4, 9.6 | 0.75 | 47 | 92 | 1 | |
| Fat | 37.0 | 35.7, 38.2 | 37.2 | 35.9, 38.6 | 0.51 | 2.7 | -2.7, 8.2 | 0.84 | 52 | 95 | 1 | |
| Carbohydrates | 40.5 | 39.3, 41.8 | 40.7 | 39.4, 41.9 | 0.74 | 1.8 | -3.7, 7.3 | 0.82 | 52 | 94 | 1 | |
| Sugar | 4.9 | 4.4, 5.4 | 5.0 | 4.5, 5.5 | 0.63 | -6.8 | -17.4, 3.7 | 0.75 | 60 | 95 | 2 | |
| Fiber | 2.7 | 2.5, 2.8 | 2.7 | 2.5, 2.8 | 0.59 | 1.6 | -4.4, 7.6 | 0.86 | 61 | 92 | 0 | |
| Alcohol | 1.4 | 0.3, 2.7 | 1.2 | 0.3, 2.7 | 0.65 | -5.7 | -16.0, 4.7 | 0.88 | 67 | 96 | 0 | |
a
p-value, test of difference in intake between first and second WebFFQ, Paired sample t-test. Significant difference set at p < 0.05.
b
Percentage difference in intake between first and second WebFFQ, WebFFQ1-WebFFQ2.
c
Pearson correlation between first and second WebFFQ.
d
Misclassification of intake defined as opposite quartiles.
e
Skewed distribution, data and analyses presented as median, Inter quartile range, Wilcoxon signed rank test and Spearman correlation. FFQ, Food frequency questionnaire; g/d, gram per day; 95% CI, 95% confidence interval.