Index of Premature Ejaculation: A New Questionnaire to Assess Changes in Control Over Ejaculation and Satisfaction With Sex Life.

Index of Premature Ejaculation: A New Questionnaire to Assess Changes in Control Over Ejaculation and Satisfaction With Sex Life, Stanley Althof, Case Western Reserve University School of Medicine; Ray Rosen, Robert Wood Johnson Medical School; Mundayat Rajiv, Kathryn May, and Tara Symonds, Pfizer Ltd.

We developed and validated a new questionnaire to measure the overall experience of premature ejaculation (PE). Test items were initially developed through discussion with two sex therapists and through in-depth interviews with men with PE. The psychometric analyses were conducted on a sample of PE sufferers (n = 926) who ejaculated in less than 2 minutes in 70% of attempts at sexual intercourse, and non-PE men (n = 154) who self-reported latencies. Factor analysis revealed a three-factor solution: Sexual Satisfaction, Control, and Distress. Reliability was good and convergent validity was as predicted when correlated with the Sexual Quality of Life Assessment tool. Discriminant validity was excellent, with non-PE subjects scoring significantly higher than PE sufferers on all domains. This tool has the potential to add value to interpretations of improvements in ejaculation latency resulting from new treatments of PE. Further research will need to investigate the Index of Premature Ejaculation's (IPE's) sensitivity to change and define a minimum important difference for each domain.