The British Journal of Psychiatry 148: 655-657 (1986)
© 1986 The Royal College of Psychiatrists
Prevalence of the fragile X syndrome in an institution for the mentally handicapped
DA Primrose, R el-Matmati, E Boyd, C Gosden and M Newton
In an investigation to find the prevalence of the fragile X (Martin Bell)
syndrome in a mental handicap hospital, chromosomal investigations were
carried out in 196 males selected out of a total of 512, and also in 20
female patients who were related to some of the selected males. Fragile X
cells were found in 41 of the males and two of the females; in 21 of the
males it was associated with macro- orchidism. The overall prevalence in
the hospital for males (8.0%) ranks this syndrome next in importance to
Down's syndrome as a known cause for mental handicap.