From: Can we use biomarkers in combination with self-reports to strengthen the analysis of nutritional epidemiologic studies?
True diet lutein
(TDI)
Reported diet lutein (RDI)
True serum lutein
(TBL)
Measured serum lutein (MBL)
FFQ
6 × 24 HR
TDI
1.00
RDI
0.51
0.68
TBL
0.69
0.35
0.47
MBL
0.61
0.31
0.42
0.89