Table 3.

Degree of association and level of agreement between average daily food group intakes by FD and FFQ.

Food Group	Average Daily Consumption (Serving/Day)					Level of Agreement			Correlation Coefficient *
	FD		FFQ			FFQ-FD 1		FFQ:FD 2	Unadjusted 3	Energy-Adjusted 4	Deattenuated 5
	Mean	SD	Mean	SD	p-Value 6	Mean	SD		Pearson	Pearson	Pearson
Grain, Cereal, Bread	4.70	1.67	9.83	2.42	<0.001	5.14	2.30	2.22	0.42	0.33	0.35
Vegetable	1.88	1.13	1.53	0.25	<0.001	−0.38	1.05	0.91	0.16	0.21	0.25
Legumes, Pulses, Seeds	1.15	0.24	1.16	0.14	0.620	0.00	0.26	1.03	0.23	0.34	0.55
Fish, Poultry, Meat, Egg	1.30	0.30	1.74	0.89	<0.001	0.50	0.85	1.41	0.41	0.42	0.51
Milk	1.02	0.11	1.29	0.36	<0.001	0.23	0.29	1.21	0.68	0.66	0.80
Fruits	2.08	2.94	1.66	0.89	0.060	−0.49	2.28	1.13	0.75	0.79	≠
Beverages	1.08	0.28	1.60	1.19	<0.001	0.55	1.05	1.47	0.65	0.85	0.90

* For all correlations, p < 0.001. ¹ FFQ-FQ represents the difference between intake measured by FFQ and intakes measured by FD; ² FFQ:FD represents the percent ratio of paired FFQ and FD intake measurements; ³ Calculated based on log-transformed value of average daily consumptions; ⁴ Calculated based on log-transformed value of average daily consumptions with adjustment for total energy intake using the residual method; ⁵ Correction were calculated based on energy-adjusted correlation accounting for random within-individual error in the two 3-day FD; ⁶ Paired t-test comparing FFQ and FD in daily average intakes. ≠ Correction coefficient not calculated due to the very large ratio of within-person to between-person variances.