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. 2013 Dec 19;14(Suppl 1):S4. doi: 10.1186/1472-6939-14-S1-S4

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Copyright © 2013 Mduluza et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. 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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Showing the trends in levels of participation according to groups used in the analysis at different follow-up time points for the study sites summarized. The time points for each group may differ in year and type of study but the measurement was similar of the research subject willingness to participate.