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. 2019 May 3;19:130. doi: 10.1186/s12909-019-1561-7

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© The Author(s). 2019

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 — The relationship between participants’ age and mean value of willingness measure (WTR), according to gender (right column for males and left column for females); (a + b) describe the results of two multivariate spline regression models, the dependent variable being ‘willingness to respond’: (a) independent variables included in the model are age and spline age-based knots (X25, X30, X35, X40, X45, X50, X55, X60, X64); (b) independent variables included in the model are spline knots and age, profession, efficacy, and professional obligation. *The blue lines represent the observed values of WTR. Red dashed lines represent expected WTR.