Br Med J (Clin Res Ed). 1986 Nov 29;293(6559):1401-4. doi: 10.1136/bmj.293.6559.1401.
A total of 1849 boys born to mothers resident in a defined area around Oxford were examined for cryptorchidism. Those born in hospital were examined at birth and again after three months if cryptorchid at the earlier examination. The incidence of cryptorchidism at three months adjusted to the birthweight distribution of England and Wales was 1.58%. By comparison, in a very similar study conducted around 1960 the incidence was 0.96%. Hence the cryptorchidism rate had apparently increased by 65% over the two decades, which contrasted with the twofold increase in the national orchidopexy rate. The proportion of boys undergoing orchidopexy appeared consistently to be roughly twice the proportion of boys with an undescended testis at 3 months of age. The increase in cryptorchidism and disparity with the rate of orchidopexy are not easily explained and are the subjects of continuing study.
对居住在牛津周边特定区域的母亲所生的1849名男婴进行了隐睾症检查。在医院出生的婴儿在出生时接受检查，如果在早期检查时为隐睾，则在三个月后再次检查。根据英格兰和威尔士的出生体重分布调整后，三个月时隐睾症的发病率为1.58%。相比之下，在1960年左右进行的一项非常类似的研究中，发病率为0.96%。因此，在这二十年中，隐睾症发病率显然上升了65%，这与全国睾丸固定术率增加两倍形成对比。在3个月大时接受睾丸固定术的男孩比例似乎一直大致是睾丸未降男孩比例的两倍。隐睾症的增加以及与睾丸固定术率的差异难以解释，仍是持续研究的课题。
