The 15-question International Index of Erectile Function (IIEF) Questionnaire is a validated, multi dimensional, self-administered investigation that has been found useful in the clinical assessment of erectile dysfunction and treatment outcomes in clinical trials.

A score of 0-5 is awarded to each of the 15 questions that examine the 4 main domains of male sexual function: erectile function, orgasmic function, sexual desire and intercourse satisfaction.

Clinical Application :

IIEF assessment is limited by the superficial assessment of psychosexual background and the very limited assessment of partner relationship, both important factors in the presentation of male sexual dysfunction.

Analysis of the questionnaire should, therefore, be viewed as an adjunct to, rather than a substitute for, a detailed sexual history and examination.

References:
https://pubmed.ncbi.nlm.nih.gov/9187685/

The international index of erectile function (IIEF): a multidimensional scale for assessment of erectile dysfunction.