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Fig. 3 | Archives of Public Health

Fig. 3

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

Fig. 3

Simulation of the simulated BNFCS2004. Legend: The “simulated BNFCS2004” consisting of two 24HRs per individual was simulated separately in the three age strata: the adolescents (15–18 years), the adults (19–59 years) and the elderly (60–74 years). The grey-shaded steps are performed at the transformed scale. In box A, the consumers only in the “original BNFCS2004” are modeled to extract the needed modeling parameters. In box B, these parameters were used to simulate two 24 HRs for every (non-) consumer resulting in the “simulated BNFCS2004 for consumers only”. In box C, the correct proportion of never-consumers gets assigned two 24 HRs with an intake amount equal to zero. Finally, the two 24 HRs of the (non-) consumers and the never-consumers are combined to obtain the “simulated BNFCS2004”

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