Figure 1.

Study design and patient dispositions. One hundred and eighty-six patients were screened for enrolment in this study. One hundred patients met the screening criteria and were randomized. At the 13-month follow-up, 91 patients had completed the study, including 22 in Group C, 24 in Group T, 22 in Group V, and 23 in Group T+V. Group C: control group; Group T: tadalafil 5 mg oral OaD; Group V: vacuum erectile devices treatment for 15 min twice daily; Group T+V: tadalafil 5 mg oral OaD combined vacuum erectile devices treatment for 15 min twice daily. OaD: once a day.