“…In this study, the predictors included age, monthly income, BMI, educational level, smoking, chronic diseases, frequency of sexual intercourse, sexual desire, feelings about the spouse, masturbation and self-reported sexual satisfaction, all of which have been shown to affect the occurrence of ED (Ahn et al, 2007;Boddi et al, 2015;Fugl-Meyer et al, 2009;Martins & Abdo, 2010;Molina-Vega et al, 2019;Mulhall et al, 2016;Qin et al, 2012;Salonia et al, 2014;Wang et al, 2018). Accumulating studies have shown that general characteristics, including educational level, BMI, income, age, smoking and chronic diseases, are risk factors for ED (Ahn et al, 2007;Molina-Vega et al, 2019;Mulhall et al, 2016;Shin et al, 2011;Sun et al, 2006;Wang et al, 2018).…”