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. 2017 Oct 30;75:46. doi: 10.1186/s13690-017-0214-8

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© The Author(s). 2017

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Detail of the intake frequency and the intake amount modeling in the SPADE 2-part model. Legend: Firstly, the SPADE 2-part model estimate the intake frequency and then it estimates the intake amounts. Finally, the intake frequency and the intake amount are combined to obtain the usual intake distribution of (a) whole the population when information on the never-consumers is not taken into account; or (b) the consumers only when information on the never-consumers is taken into account [21, 22]