Validation of Stopwatch Measurements of Erection Duration against Responses to the Sexual Encounter Profile and International Index of Erectile Function in Patients Treated with a Phosphodiesterase Type 5 Inhibitor

This study provides evidence for the validity and reliability of stopwatch-assessed duration of erection. Our findings suggest that erection duration is suitable for use as a unique endpoint in ED treatment-efficacy trials conducted for phosphodiesterase type 5 inhibitors. Shaw JW, Reardon G, Sandor DW, Rosen RC, and Ferguson DM. Validation of stopwatch measurements of erection duration against responses to the Sexual Encounter Profile and International Index of Erectile Function in patients treated with a phosphodiesterase type 5 inhibitor.