Table 4.

Additive (α_k) and Scaling (β_k) Bias for Each Self-Report Instrument for Total Carotenoid Intake in a WHEL Sample of 3,088 Breast Cancer Survivors Recruited Between 1995 and 2000 and Followed Through 2006

Assessment Methoda	Error Correlation in Repeated Plasma Measures (r)
	r = 0				r = 0.3b
	Comparison (n = 1,551)		Intervention (n = 1,537)		Comparison (n = 1,551)		Intervention (n = 1,537)
	Bias Estimate	95% Credible Interval	Bias Estimate	95% Credible Interval	Bias Estimate	95% Credible Interval	Bias Estimate	95% Credible Interval
24-Hour recalls
α1	−0.24	−0.27, −0.22	0.06	0.02, 0.10	−0.25	−0.27, −0.22	0.07	0.03, 0.11
β1	0.77	0.70, 0.84	1.10	1.01, 1.19	0.74	0.67, 0.81	1.04	0.96, 1.13
Arizona food frequency questionnaire
α2	−0.11	−0.13, −0.09	0.02	−0.01, 0.05	−0.11	−0.13, −0.09	0.03	−0.01, 0.06
β2	0.55	0.49, 0.61	0.70	0.64, 0.76	0.53	0.47, 0.58	0.66	0.61, 0.72

Abbreviation: WHEL, Women's Healthy Eating and Living.

^aSelf-reported dietary intakes adjusted for body mass index and total caloric intake; plasma markers adjusted for plasma cholesterol and body mass index.

^bAssumed first-order autoregressive correlation structure for plasma error matrix.