Purpose: Male erectile dysfunction has a substantial impact on health related quality of life. We examined the psychometric properties of 2 new scales created to measure the psychological impact of erectile dysfunction.
Materials and methods: Patients enrolled in a long-term study of men with erectile dysfunction completed clinical and health related quality of life information at baseline and at 3 followup points. The questionnaire incorporated a number of standard scales of psychosocial characteristics as well as questions developed from comments made during focus groups of men with erectile dysfunction and of their female partners. Principal components analysis was used to identify underlying constructs in response to the new questions.
Results: A total of 168 men completed the baseline quality of life questionnaire. The principal components analysis of the psychological impact of erectile dysfunction questions resulted in 2 new scales. Reliability was good with an internal consistency reliability of 0.91 for scale 1 and 0.72 for scale 2. Test-retest reliability was 0.76 and 0.66, respectively. Men reporting a greater psychological impact of erectile dysfunction also reported greater impairment in functional status, lower sexual self-efficacy, greater depression and anxiety at the last intercourse. Each new scale significantly differentiated men with mild/moderate versus severe erectile dysfunction.
Conclusions: We developed 2 new scales to measure the psychological impact of erectile dysfunction and they showed good reliability and validity. These new scales, named the Psychological Impact of Erectile Dysfunction instrument, comprehensively capture the psychological effect of erectile dysfunction on health related quality of life, which is not adequately assessed by existing patient centered measures of erectile function.