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Comparison of 3 cohort studies, with the follow-up of neonates diagnosed with a cryptorchidism at birth

	United Kingdom		United States
Period of Follow-up	(Oxfordshire Area) (n = 3612)*	(n = 7400) ${dagger}$	(New York City) (n = 6935) ${ddagger}$

Percentage with a cryptorchidism:
At birth	4.20	5.00	3.68
At 3 mo	0.97	1.78	1.00
At 1 y	0.78	...	1.06

*From Scorer (1964).
${dagger}$ From the John Radcliffe Hospital Study Group (1992).
${ddagger}$ From Berkowitz et al (1993).