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front |1 |2 |3 |4 |5 |6 |7 |8 |9 |10 |11 |12 |review |
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Looking at
the VCs we can say that dietary recalls performed better than the FFQ and the biomarker
and that all the three methods were relatively valid! Using the estimates from the
second FFQ (Q2) we see that the VCs are about the same as when Q1 was used. Thus the FFQ
is fairly reproducible. The VCs (and bootstrap confidence intervals) when using Q2 follow:
VCQT =
√((rQR *
rQM)/rRM)
= √((0.40 * 0.18)/0.45) = 0.40 (0.16-0.60);
VCRT =
√((rQR *
rRM)/rQM)
= √((0.40 * 0.45)/0.18) = 0.98 (0.64-1.00);
VCMT =
√((rQM *
rRM)/rQR)
= √((0.18 *0.45)/0.40) = 0.45 (0.23-0.73).
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