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Mean score for the Sexual Encounter Profile question 3 (SEP3) for subgroups by erectile dysfunction (ED) characteristics. *p<0.001, †p<0.02, ‡p<0.0002. Copyright © 2002. Carson CC, Burnett AL, Levine LA, et al. 2002. The efficacy of sildenafil citrate (Viagra) in clinical populations: an update. Urology, 60:12–27.
