TABLE 4.
VCs and 95% CIs between T and Q, R, and M and P, calculated by using the method of triads1
| VC | 95% CI | |
| FFQs (Q, T)2 | 0.46 | 0.20, 0.93 |
| TUPs (M, T)3 | 0.18 | 0.04, 0.32 |
| Plasma carotenoids (P, T)3 | 0.49 | 0.25, 1.004 |
| 24-HRs (R, T)2 | 0.61 | 0.38, 1.00 |
| TUPs (M, T)5 | 0.32 | 0.12, 0.58 |
| Plasma carotenoids (P, T)5 | 0.27 | 0.09, 0.46 |
n = 570. Correlations were adjusted for age, race, sex, and BMI. BCa CIs were based on 2000 resampling. Correlations including 24-HRs deattenuated by using a mixed model were used to estimate the within- and between-subject variances. BCa, bias-corrected and accelerated bootstrap; FFQ, food-frequency questionnaire; M, biomarker total urinary polyphenol variable; P, biomarker plasma carotenoids variable; Q, polyphenol intake estimates from FFQs variable; R, polyphenol intake estimates from 24-HRs variable; T, true polyphenol intake variable; TUP, total urinary polyphenol; 24-HR, 24-h dietary recall; VC, validity coefficient.
Polyphenol intakes from FFQs and 24-HRs were transformed by using log (x + 1) and each FFQ and recall were energy-adjusted by using a partitioned approach. The 24-HR variable represents polyphenol intake from the mean of synthetic week 1 and week 2 of recalls.
Uses Q as the dietary estimator.
The estimated upper limit exceeded 1 and was thus set to 1.00.
Uses R as the dietary estimator.