Table 3.
Summary statistics for a selection of constituents estimated during the diet diary analysis by DietPlan6 and by duplicate diet analysis.
| Constituent | n | DietPlan6 |
Duplicate diet |
DIFF: DP6-DD |
Trend |
||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | ±SD | Mean | ±SD | Mean | ±SD | P diff | P trend | ||
| Sulphur (mg) | 18 | 956 | ±327.9 | 935 | 329.9 | 20.2 | 240.2 | 0.7251 | 0.9726 |
| Sodium (mg) | 18 | 2500 | ±1752 | 1764 | 1295 | 736 | 612 | 0.0001 | 0.0003 |
| Calcium (mg) | 18 | 890 | ±378.7 | 955 | 400.4 | −65 | 299.8 | 0.3707 | 0.7576 |
| Iron (mg) | 18 | 14.33 | ±5.446 | 13.47 | 6.696 | 0.86 | 4.355 | 0.4129 | 0.2173 |
| Magnesium (mg) | 18 | 322.6 | ±96.65 | 339.2 | 98.44 | −16.6 | 47.92 | 0.1610 | 0.8795 |
| Phosphorus (mg) | 18 | 1485 | ±460.1 | 1349 | 458.6 | 136 | 290.8 | 0.0625 | 0.9835 |
| Potassium (mg) | 18 | 3466 | ±1237 | 3785 | 1149 | −319 | 758 | 0.0918 | 0.6297 |
| Zinc (mg) | 18 | 11.07 | ±4.724 | 8.36 | 3.110 | 2.71 | 2.791 | 0.0007 | 0.0079 |
n, sample size; SD, standard deviation; DIFF: DP6-DD, paired difference in the estimates by DietPlan6 and duplicated diary analysis; P diff, significance of difference based on paired t-test; P trend, significance of linear trend based on the correlation between the sum and difference of the two estimates; mg, milligram.