Table 4 |
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|
Measures of reproducibility for the daily intake of energy and selected nutrients in the test and retest food frequency questionnaire (FFQ), n = 1370 |
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|
Test (FFQ1) |
Retest (FFQ2) |
Within person differences (FFQ1-FFQ2) |
Pearson |
Spearman |
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|
|
|
|
|
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|
Nutrient |
Mean |
SDa |
Mean |
SD |
Mean |
95% CIb |
Mean ± 2 SDc |
r |
95% CI |
rs |
|
|
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|
Energy (kJ) |
6571 |
1748 |
6400 |
1732 |
170.2 |
(91.5, 249.0) |
(-2801, 3142) |
0.64 |
(0.60, 0.67) |
0.63 |
|
Protein (g) |
73.6 |
21.3 |
71.5 |
21.0 |
2.1 |
(1.0, 3.1) |
(-36, 40) |
0.60 |
(0.56, 0.63) |
0.60 |
|
Total fat (g) |
60.0 |
20.1 |
58.4 |
19.4 |
1.6 |
(0.7, 2.5) |
(-32, 35) |
0.63 |
(0.60, 0.66) |
0.64 |
|
Polyunsaturated fat (g) |
11.0 |
4.4 |
10.7 |
4.3 |
0.2 |
(0.1, 0.4) |
(-7, 8) |
0.65 |
(0.62, 0.68) |
0.66 |
|
Total carbohydrate (g) |
179.4 |
49.9 |
174.0 |
50.9 |
5.4 |
(3.2, 7.6) |
(-77, 87) |
0.67 |
(0.64, 0.70) |
0.67 |
|
Dietary fiber (g) |
19.6 |
6.2 |
18.6 |
5.9 |
1.0 |
(0.7, 1.2) |
(-9, 11) |
0.67 |
(0.64, 0.70) |
0.66 |
|
Sugar (g) |
22.1 |
13.4 |
22.3 |
13.7 |
-0.2 |
(-0.8, 0.4) |
(-21, 21) |
0.70 |
(0.67, 0.72) |
0.71 |
|
Alcohol (g) |
2.2 |
3.2 |
2.8 |
3.5 |
-0.6 |
(-0.7, -0.5) |
(-6, 4) |
0.72 |
(0.69, 0.75) |
0.77 |
|
Retinol (REd, μg) |
1192 |
490 |
1142 |
482 |
50.3 |
(29.3, 71.3) |
(-742, 843) |
0.67 |
(0.64, 0.70) |
0.66 |
|
Vitamin D (μg) |
12.4 |
9.0 |
12.3 |
8.5 |
0.1 |
(-0.3, 0.5) |
(-14, 14) |
0.69 |
(0.66, 0.72) |
0.70 |
|
Vitamin E (mg) |
11.0 |
7.4 |
11.0 |
7.4 |
0.0 |
(-0.3, 0.3) |
(-10, 10) |
0.78 |
(0.76, 0.80) |
0.73 |
|
Vitamin C (mg) |
106 |
50 |
96 |
48 |
9.6 |
(7.5, 11.7) |
(-69, 88) |
0.68 |
(0.65, 0.70) |
0.69 |
|
Calcium (mg) |
624 |
246 |
600 |
248 |
23.2 |
(10.8, 35.6) |
(-445, 492) |
0.55 |
(0.51, 0.59) |
0.60 |
|
% energy from protein |
19.2 |
2.9 |
19.1 |
3.0 |
0.0 |
(-0.1, 0.2) |
(-5, 5) |
0.70 |
(0.67, 0.72) |
0.69 |
|
% energy from fat |
33.5 |
4.8 |
33.5 |
4.8 |
0.0 |
(-0.3, 0.2) |
(-8, 8) |
0.65 |
(0.62, 0.68) |
0.65 |
|
% energy from carbohydrate |
46.5 |
5.8 |
46.3 |
5.9 |
0.3 |
(0.0, 0.6) |
(-10, 10) |
0.64 |
(0.61, 0.67) |
0.63 |
|
% energy from sugar |
5.7 |
3.0 |
5.8 |
3.0 |
-0.2 |
(-0.3, -0.1) |
(-5, 5) |
0.68 |
(0.65, 0.71) |
0.68 |
|
% energy from alcohol |
1.0 |
1.6 |
1.4 |
1.8 |
-0.3 |
(-0.4, -0.2) |
(-3, 2) |
0.74 |
(0.72, 0.76) |
0.78 |
|
|
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|
aSD = Standard deviation, bCI = Confidence interval, cReferred to as limits of agreement in the text, dRetinol equivalents |
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|
Parr et al. Nutrition Journal 2006 5:4 doi:10.1186/1475-2891-5-4 |
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