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. 2017 Feb 13;11(3):737–747. doi: 10.1177/1557988316689238

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© The Author(s) 2017

This article is distributed under the terms of the Creative Commons Attribution-NonCommercial 3.0 License (http://www.creativecommons.org/licenses/by-nc/3.0/) which permits non-commercial use, reproduction and distribution of the work without further permission provided the original work is attributed as specified on the SAGE and Open Access page(https://us.sagepub.com/en-us/nam/open-access-at-sage).

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Figure 3. — Hierarchical cluster analysis for sexual function by age.

Note. ED = erectile dysfunction. Black filled circles represent Cluster 1 = middle-aged men without ED. Black empty circles represent Cluster 2 = middle-aged men with ED. Black filled triangles represent Cluster 3 = older men without ED. Black empty triangles represent Cluster 4 = older men with ED.