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. 2020 Jan 17;6:499. doi: 10.3389/fvets.2019.00499

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Copyright © 2020 de Assis, Matos, Pike, Burman and Mills.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Flow diagram showing population at different stages of analysis of the original survey. (1) total number of respondents including incomplete questionnaires; (2) number of questionnaires that were complete but had at least one uncertain response, i.e., “I don't know”; (3) number of questionnaires that were complete without any uncertain responses for any of the 157 variables of interest; (4) number of questionnaires that were complete and had definite responses for the 56 variables of interest which loaded on the components identified by the first PCA, but which had not been included in stage 3 due to uncertain answers in some of the other 101 items; (5) total number of questionnaires with complete and definite answers for the 56 behavioral variables identified at stage 3. Principal component analysis was performed on the populations represented by the last 3 stages.