The clinical efficacy of erectogenic agents can be measured with a variety of instruments . The most common instrument is the global efficacy assessment question ( GAQ ), which asks patients ” Did the treatment that you used for your erections improve your erections during the time of therapy “. Although this is an important endpoint measure , it is not as rigorous as some other measures . However , it is the standard measurement for most clinical studies of erectile function agents . Other endpoints include a measurement of the percent of suc- cessful attempts at intercourse and a measurement of the International Index of Erectile Function ( LIEF ) with changes in the erectile function domain score from baseline to study completion . Using this score , values less than 10 sug- gest severe ED and values higher than 26 suggest normal erectile function . Other methods used for measurement include sexual encounter profile ques- tions ( SEP ). The SEP-2 asks , ” Were you able to insert your penis into your partner ‘ s vagina ” and the SEP-3 asks , ” Did your erections last long enough to have successful intercourse ?”
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