Basic characteristics of persons with Klinefelter's syndrome (KS) or 47,XYY
| Karyotype | No. of persons at risk | No. of persons with at least one conviction | Median age at diagnosis (95% CI) | Median year of diagnosis (95% CI) | Median year of birth (95% CI) |
| 47,XXY (KS) | 934 | 385 | 27.7 (26.6 to 28.3) | 1986 (1984 to 1987) | 1961 (1959 to 1962) |
| Controls (KS) | 88 829 | 37 085 | – | – | – |
| 47,XYY | 161 | 80 | 20.6 (17.6 to 23.7) | 1985 (1982 to 1989) | 1969 (1963 to 1971) |
| Controls (47,XYY) | 15 356 | 6284 | – | – | – |