The information below shows a list of types of Sex chromosome conditions, with information as to the annual incidence of each of these types of Sex chromosome conditions. Estimates of the people affected each year are calculated based on the available statistics.
Disease | Incidence Estimate | US people estimate | Statistic Used for Calculation |
| Turner Syndrome | N/A | N/A | No information |
| Klinefelter syndrome | approx 1 in 68,000 or 0.00% or 4,000 people in USA | 4,000 | 1-in-500 to 1-in-1000 male births (NIDCD) |
| Jacobs syndrome | N/A | N/A | No information |
| Triple-X syndrome | approx 1 in 54,400,000 or 0.00% or 5 people in USA | 5 | 5-10 girls are born with triple X syndrome each day, Genetics Home Reference website |
For more information about types of Sex chromosome conditions, refer to our section on types of Sex chromosome conditions.
The medical term 'incidence' of Sex chromosome conditions usually refers to the annual diagnosis rate of new cases of Sex chromosome conditions. Prevalence is a different medical disease measure that refers to the estimated population of people who are managing Sex chromosome conditions at any given time (e.g. prevalence includes people who have had a medical condition for a long time). For more information on prevalence and incidence statistics, see about prevalence and incidence statistics.
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