title: The epidemiology of cryptorchidism. John Radcliffe Hospital Cryptorchidism Research Group.
abstract: A total of 3,559 boys were examined for cryptorchidism over a 2-year period. At birth, 5.9% (210/3,534) had one or both testes undescended and at 3 months of age 1.61% (57/3,534) still had an undescended testis. These figures represent an increase in undescended testis of 40% at birth and 68% at 3 months when compared with figures collected in a similar study in the late 1950s. This increase in cryptorchidism still does not account for the increased number of orchiopexies being performed. Low birthweight was also found to be a risk factor for the presence of an undescended testis.
authors.affiliation: Imperial Cancer Research Fund Cancer Epidemiology Unit, Radcliffe Infirmary, Oxford.
authors.forename: M B
authors.initials: MB
authors.lastname: Jackson
mesh_terms: D000367:Age Factors; D003430:Cross-Sectional Studies; D003456:Cryptorchidism / Q000453:epidemiology* / Q000601:surgery; D004739:England; D006801:Humans; D007223:Infant; D007230:Infant, Low Birth Weight; D007231:Infant, Newborn; D008297:Male; D012307:Risk Factors