1. Volume 45, Issue 5, Pages 628-633 (May 2004)
Effects of Age, Comorbidity and Lifestyle Factors on Erectile Function: Tampere Ageing Male Urological Study (TAMUS) 
Rahman Shiri, Juha Koskimäki, Jukka Häkkinen, Teuvo L.J Tammela, Heini Huhtala, Matti Hakama, Anssi Auvinen 
European Urology 
Volume 45, Issue 5, Pages (May 2004)
DOI: /j.eururo

2. Fig. 1
Mean scores of ED by age with regression line, Tampere Ageing Male Urological Study (ED scores: 0 = none, 1 = minimal, 2 = moderate, 3 = complete ED).
European Urology  , DOI: ( /j.eururo )