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. 2022 Aug 23;23(6):1159–1172. doi: 10.1007/s11154-022-09748-3

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© The Author(s) 2022

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 2 — Unadjusted and (age and chronic disease score, CDS) adjusted relationships (derived from fitting regression model) between prostaglandin E1 (PGE1)-stimulated penile blood (dynamic peak systolic velocity, PSV) at penile doppler ultrasound and total testosterone in a cohort of more than 2500 men complaining of sexual dysfunction at the university of Florence, Florence, Italy