Figure 2.

Total duration of grade 3 (hard enough for penetration) and grade 4 (fully hard) erections, determined from patient self-assessment during 60 min of visual sexual stimulation in Study II. (a) and (b) show median values determined starting 2 and 4 h after dosing, respectively; bars indicate the range between minimum and maximum values. (c) and (d) show mean values determined starting 2 and 4 h after dosing, respectively. All patients (□); responders (▪). Bars indicate s.e. mean. *P < 0.001 vs placebo; †P < 0.01 vs placebo.