Nearly all torsions happen to adolescent males--between the ages of 12 and 18--because their testes enlarge by a factor of five to six during puberty.
Testicular torsion most commonly occurs in teenagers and young adults. The risk does decrease as the person ages, but this is because testicular torsion usually occurs during exercise and young men tend to exercise more than other age groups.
There is some variation among racial and ethnic groups, with men of Scandinavian background having higher than average rates of testicular cancer, and African-American men having a lower than average incidence.
In the United States, the disease is primarily confined to slaughterhouse workers.
ITP does not appear to be related to race, lifestyle, climate, or environmental factors.
Thoracic outlet syndrome is most common in women who are 35 to 55 years of age.
Having African American, Hispanic, Native American, or Asian American/Pacific Islander heritage.
Tasmanian devils tend to be solitary animals. They do not live in groups.
Threadworm infection, which is also called strongyloidiasis, occurs in most countries of the world but is natural to (endemic in) tropical and subtropical climates.
Organizing nursing groups to tend to the wounded.
There is a slightly higher incidence in females. Whites and Asians are more susceptible to developing ARMD than blacks, in whom the disorder is rare.
Patients with nephrotic syndrome are from all age groups, although in children there is an increased risk of the disorder between the ages of 18 months and four years. In children, boys are more frequently affected; in adults.
Otosclerosis is a common hereditary condition. About 10% of the Caucasian population has some form of otosclerosis, however, it is rare among other ethnic backgrounds. Women are more likely than men to suffer from otosclerosis.