Table 3 Pooled effect estimates and heterogeneity of the correlation coefficients for the reproducibility of FFQ for micronutrient*
Nutrient | ICC | SCC | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Crude | Energy-adjusted | Crude | Energy-adjusted | |||||||||
N | ICC (95% CI) | I2 | N | ICC (95% CI) | I2 | N | ICC (95% CI) | I2 | N | ICC (95% CI) | I2 | |
Vitamin A | 27 | 0.623 (0.544, 0.692) | 95.2 | 12 | 0.597 (0.464, 0.705) | 92.2 | 42 | 0.613 (0.570, 0.651) | 87.2 | 22 | 0.553 (0.470, 0.627) | 89.8 |
Retinol | 18 | 0.589 (0.513, 0.656) | 85.3 | 9 | 0.537 (0.421, 0.635) | 74 | 49 | 0.573 (0.537, 0.607) | 80.6 | 38 | 0.513 (0.460, 0.562) | 84.3 |
Carotene | 9 | 0.632 (0.499, 0.735) | 97.1 | 5 | 0.512 (0.328, 0.658) | 0.86 | 25 | 0.605 (0.558, 0.649) | 89 | 21 | 0.510 (0.427, 0.584) | 90.8 |
β-Carotene | 21 | 0.677 (0.630, 0.719) | 76.1 | 6 | 0.613 (0.456, 0.733) | 81.9 | 39 | 0.613 (0.573, 0.649) | 72.3 | 28 | 0.554 (0.513, 0.593) | 56.5 |
Vitamin C | 47 | 0.665 (0.600, 0.722) | 96.1 | 22 | 0.635 (0.526, 0.723) | 94.9 | 92 | 0.623 (0.594, 0.650) | 85.3 | 57 | 0.596 (0.555, 0.633) | 83.6 |
Vitamin D | 16 | 0.678 (0.546, 0.777) | 98.4 | 5 | 0.671 (0.391, 0.837) | 98.1 | 30 | 0.617 (0.572, 0.659) | 83.5 | 15 | 0.560 (0.475, 0.635) | 81.5 |
Vitamin E | 34 | 0.665 (0.576, 0.738) | 97.5 | 15 | 0.606 (0.484, 0.704) | 94.4 | 52 | 0.626 (0.583, 0.667) | 91.4 | 30 | 0.555 (0.490, 0.613) | 87 |
Vitamin K | 3 | 0.656 (0.430, 0.804) | 97.4 | 2 | 0.693 (0.652, 0.729) | 0 | 7 | 0.602 (0.511, 0.679) | 60.4 | 5 | 0.658 (0.553, 0.742) | 32.7 |
Thiamin | 31 | 0.630 (0.587, 0.670) | 87.3 | 12 | 0.606 (0.492, 0.699) | 93.1 | 55 | 0.606 (0.579, 0.633) | 74.3 | 39 | 0.522 (0.475, 0.566) | 79.5 |
Riboflavin | 28 | 0.667 (0.616, 0.712) | 91.7 | 10 | 0.619 (0.483, 0.726) | 94.7 | 54 | 0.640 (0.611, 0.667) | 81 | 35 | 0.581 (0.528, 0.628) | 85.4 |
Niacin | 22 | 0.667 (0.609, 0.718) | 89.4 | 10 | 0.605 (0.499, 0.693) | 90.7 | 39 | 0.643 (0.573, 0.704) | 94.3 | 34 | 0.517 (0.452, 0.576) | 86.2 |
Vitamin B6 | 13 | 0.723 (0.522, 0.847) | 98.4 | 5 | 0.712 (0.516, 0.838) | 96.6 | 27 | 0.610 (0.553, 0.662) | 78.8 | 19 | 0.555 (0.483, 0.619) | 77.2 |
Folate | 25 | 0.637 (0.582, 0.686) | 90.5 | 6 | 0.597 (0.495, 0.684) | 76.4 | 49 | 0.612 (0.577, 0.646) | 81.6 | 26 | 0.605 (0.544, 0.659) | 82.5 |
Vitamin B12 | 13 | 0.678 (0.507, 0.797) | 97.7 | 7 | 0.683 (0.496, 0.809) | 96.8 | 28 | 0.635 (0.577, 0.686) | 82.3 | 21 | 0.575 (0.490, 0.648) | 87.5 |
Se | 11 | 0.661 (0.608, 0.709) | 69.3 | 4 | 0.586 (0.429, 0.709) | 78.7 | 15 | 0.648 (0.586, 0.702) | 82.4 | 11 | 0.568 (0.446, 0.670) | 87.6 |
Mg | 19 | 0.674 (0.612, 0.728) | 88.4 | 6 | 0.617 (0.492, 0.717) | 87.5 | 30 | 0.669 (0.603, 0.725) | 89.9 | 19 | 0.629 (0.544, 0.701) | 86.8 |
Ca | 52 | 0.635 (0.588, 0.676) | 91.8 | 23 | 0.642 (0.566, 0.708) | 91 | 87 | 0.622 (0.594, 0.649) | 83 | 55 | 0.586 (0.545, 0.626) | 84.1 |
Fe | 39 | 0.640 (0.581, 0.692) | 93.9 | 19 | 0.564 (0.496, 0.625) | 79.4 | 75 | 0.613 (0.582, 0.642) | 83.8 | 47 | 0.570 (0.525, 0.612) | 82.8 |
I | 2 | 0.499 (0.338, 0.632) | 73.7 | 3 | 0.507 (0.421, 0.585) | 35 | 2 | 0.828 (0.724, 0.894) | 19.8 | 1 | 0.744 (0.600, 0.841) | N/A |
Zn | 26 | 0.595 (0.556, 0.631) | 68.8 | 12 | 0.573 (0.495, 0.641) | 72.3 | 26 | 0.623 (0.565, 0.675) | 85.3 | 18 | 0.597 (0.507, 0.675) | 86.7 |
Cu | 4 | 0.658 (0.620, 0.693) | 0 | 1 | 0.690 (0.646, 0.728) | N/A | 6 | 0.748 (0.620, 0.837) | 86.6 | 5 | 0.726 (0.608, 0.813) | 86.6 |
K | 25 | 0.672 (0.598, 0.736) | 95.4 | 7 | 0.637 (0.486, 0.752) | 93.6 | 49 | 0.637 (0.605, 0.667) | 80 | 34 | 0.608 (0.566, 0.647) | 73.4 |
P | 23 | 0.605 (0.521, 0.676) | 91.9 | 9 | 0.635 (0.544, 0.711) | 80.7 | 43 | 0.621 (0.575, 0.662) | 83.4 | 30 | 0.579 (0.521, 0.630) | 82.1 |
Na | 25 | 0.652 (0.499, 0.766) | 98.2 | 8 | 0.670 (0.474, 0.802) | 97 | 41 | 0.623 (0.582, 0.661) | 83.9 | 30 | 0.552 (0.489, 0.609) | 86.7 |
Mn | 2 | 0.621 (0.382, 0.781) | 64.8 | N/A | N/A | N/A | 5 | 0.655 (0.596, 0.707) | 0 | 2 | 0.719 (0.645, 0.779) | 0 |