PEDIATRICS Vol. 55 No. 3 March 1975, pp. 442-443
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Cryptorchidism—Incidence in British Columbia and Among Sibs

R. B. Lowry M.B., F.R.C.P. (C).1

1 Departments of Medical Genetics and Paediatrics, University of British Columbia, and The Registry for Handicapped Children and Adults, Health Branch, Government of British Columbia 855 West 10th Avenue Vancouver, B.C. V5Z 1M9, Canada

The interesting letter by Minehan and Touloukian1 which appeared in Pediatrics prompted a review of the caseload on the British Columbia Registry for Handicapped Children and Adults. The organization and ascertainment sources have been discussed previously.2-3 Our best ascertainment period for a malformation of this type began in 1964. In the period from 1964 to 1972 inclusive, there were 638 cases of either unilateral or bilateral cryptorchidism found from a total number of 158,987 live male births.