Table 1.

Bias in the estimated attenuation factor and correlation with true usual intake based on a fixed-intake model when a time-varying intake model pertains – a simple example^a

ω ϕ	0.1			0.5			2.0
ρ 12	0.9	0.5	0.1	0.9	0.5	0.1	0.9	0.5	0.1
True λR	0.32	0.25	0.19	0.30	0.24	0.17	0.24	0.19	0.14
Bias of ${\widehat{\lambda }}_{\mathrm{RF}}$ (%)b	2.6	3.7	4.4	12.9	16.6	22.2	52.5	66.8	90.9
Asymptotic Relative Bias (%)	2.6	3.3	4.5	13.2	16.7	22.7	52.6	66.7	90.9
True ρR	0.40	0.36	0.31	0.39	0.35	0.30	0.35	0.31	0.27
Bias of ${\widehat{\rho }}_{\mathrm{RF}}$ (%)b	0.0	−10.2	−22.4	10.0	0.9	−9.5	48.8	44.5	41.7
Asymptotic Relative Bias (%)	0.0	−10.5	−22.5	10.3	1.0	−9.0	48.8	44.3	41.6

^aFor details of the example see Section 4

^bRelative bias: [(Mean of Estimate – True Value)/True Value] × 100%