The single-item Erection Hardness Scale was developed to assess erection hardness in men with erectile dysfunction. The instrument was developed and validated in men with a clinical diagnosis of erectile dysfunction.
Self-administered in less than 30 seconds; It is rated on a 4-point Likert scale; and Designed for use among men who are 18+ in age.
Mulhall JP, Goldstein I, Bushmakin AG, Cappelleri JC, Hvidsten K. Validation of the erection hardness score. J Sex Med. 2007;4(6):1626-1634.