Table 1: The International Index of Erectile Function (IIEF-5) Questionnaire

Over the past 6 months:

How do you rate your confidence that you could get and keep an erection?

Very low
1

Low

2

Moderate 
3

High
4

Very high
5

When you had erections with sexual stimulation, how often were your erections hard enough for penetration?

Almost never / never
1

A few times (much less than half the time)
2

Sometimes (about half the time)
3

Most times (much more than half the time)
4

Almost always / always
5

During sexual intercourse, how often were you able to maintain your erection after you had penetrated (entered) your partner?

Almost never / never
1

A few times (much less than half the time)
2

Sometimes (about half the time)
3

Most times (much more than half the time)
4

Almost always / always
5

During sexual intercourse, how difficult was it to maintain your erection to completion of intercourse?

Extremely difficult
1

Very difficult
2

Difficult
3

Slightly difficult
4

Not difficult
5

When you attempted sexual intercourse, how often was it satisfactory for you?

Almost never / never
1

A few times (much less than half the time)
2

Sometimes (about half the time)
3

Most times (much more than half the time)
4

Almost always / always
5

IIEF-5 scoring:
The IIEF-5 score is the sum of the ordinal responses to the 5 items.
22-25: No erectile dysfunction
17-21: Mild erectile dysfunctions
12-16: Mild to moderate erectile dysfunction
8-11: Moderate erectile dysfunction
5-7: Severe erectile dysfunction

Reference: Rosen RC, Capperlleri JC, Smith MD, et al. Development and evaluation of an abridged, 5-item version of the International Index of Erectile Function (IIEF-5) as a diagnostic tool for erectile dysfunction. Int J Impot Res. 1999 Dec;11(6):319-26