Erectile dysfunction: A consistent inability to sustain an erection sufficient for sexual intercourse. Commonly known as impotence. Medically, the term erectile dysfunction is used to properly differentiate this form of impotence from other problems that interfere with sexual intercourse, such as disease, injury, drug side effects, or a disorder that impairs the nerve supply or the blood flow to the penis. Other forms of impotence include lack of sexual desire and problems with ejaculation and orgasm. Erectile dysfunction is treatable in all age groups, and treatment includes using medication (notably Viagra) and penile implants. Abbreviated ED.

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Fisher’s exact test: A statistical test of independence much used
in medical research. It tests the independence of rows and columns in a 2 X 2 contingency
table (with 2 horizontal rows crossing 2 vertical columns creating 4 places for data)
based on the exact sampling distribution of the observed frequencies. Hence it is an
“exact” test. Devised by the British geneticist and biostatistician R. A. Fisher
(1890-1962).

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