The information below shows a list of types of Sex chromosome conditions, with information as to the prevalence of each of these types. Estimates of the people affected are calculated based on the available statistic.
| Disease | Prevalence Estimate | US people estimate | Statistic Used for Calculation |
| Turner Syndrome | approx 1 in 2,500 or 0.04% or 108,800 people in USA | 108,799 | 1 per 2,500 live female births are affected by Turner syndrome, Genetics Home Reference website |
| Klinefelter syndrome | approx 1 in 500 or 0.20% or 544,000 people in USA | 544,000 | 1 per 500 - 1,000 males are affected by Klinefelter syndrome, Genetics Home Reference website |
| Jacobs syndrome | approx 1 in 2,000 or 0.05% or 136,000 people in USA | 136,000 | 1-in-2000 approximately. |
| Triple-X syndrome | approx 1 in 1,000 or 0.10% or 272,000 people in USA | 272,000 | 1 per 1,000 newborn girls suffer from triple X syndrome, 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 'prevalence' of Sex chromosome conditions usually refers to the estimated population of people who are managing Sex chromosome conditions at any given time, whereas the annual diagnosis rate of new cases of Sex chromosome conditions is called the 'incidence'. For more information on prevalence and incidence statistics, see about prevalence and incidence statistics.
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