Summary of Study Populations
Study | Year | Symptomatic/Asymptomatic | Total Sample Size | Males | Females | Age Range (yrs) |
---|---|---|---|---|---|---|
Tanz | 1953 | Asymptomatic | 55 | 17 | 38 | 10 Children, 45 Adults (2-77 years) |
Clayson | 1962 | Asymptomatic | 26 | 0 | 26 | College Age |
Froning | 1968 | Symptomatic but “Normal” by authors’ definition | 30 | unknown | unknown | unknown |
Hayes | 1986 | Asymptomatic | 59 | 59 | 0 | 19-59 |
Dvorak | 1991 | Asymptomatic | 41 | 23 | 18 | 22-50 |
Frobin | 1996 | Asymptomatic | 61 | 45 | 16 | 19-57 |