The added value of food frequency questionnaire (FFQ) information to estimate the usual food intake based on repeated 24-hour recalls

Table 3 Usual intake distribution (g/day) for the whole (consumers and never-consumers) Belgian population (15–74 years), after weighting, Belgian National Food Consumption Survey 2004

A. Water
	P0.025	P0.05	P0.25	P0.5	P0.75	P0.95	P0.975
Simulated BNFCS2004 Without FFQ information	27	60	283	515	817	1420	1667
Simulated BNFCS2004 With FFQ information	10	51	280	508	811	1423	1678
Simulated “true”	11	58	335	593	921	1535	1778
Without/“true”	2.45	1.03	0.84	0.87	0.89	0.93	0.94
With/“true”	0.91	0.88	0.84	0.86	0.88	0.93	0.94
B. Cheese
Simulated BNFCS2004 Without FFQ information	2	4	15	26	40	67	78
Simulated BNFCS2004 With FFQ information	0	1	16	28	42	70	82
Simulated “true”	0	2	18	30	44	67	77
Without/“true”	/	2	0.83	0.87	0.91	1.00	1.01
With/“true”	/	0.5	0.89	0.93	0.95	1.04	1.06
C. Fat spread
Simulated BNFCS2004 Without FFQ information	0	0	2	8	21	56	75
Simulated BNFCS2004 With FFQ information	0	0	0	8	20	51	67
Simulated “true”	0	0	0	8	22	58	75
Without/“true”	/	/	/	1	0.95	0.97	1
With/“true”	/	/	/	1	0.91	0.88	0.89

Abbreviations: without FFQ information usual intake distribution, distribution of the simulated BNFCS2004; without inclusion of FFQ information on the never consumers, with FFQ information the same but after inclusion of the information on the never consumers; simulated “true” simulated “true” usual intake distribution, without/“true” the ratio of without FFQ information to simulated “true”, with/“true” the ratio of with FFQ information to simulated “true”

ISSN: 2049-3258