“…In a cross sectional Dutch study, Hack et al (Hack et al 2007a) found a prevalence of acquired UDT up to 2.2% among 6-13 year old boys. Acerini et al (Acerini CL et al 2009), in a UK infant cohort study observed a cumulative incidence up to 7% at the age of 24 months (0.7%, 4%, 1.3% , and 1% at ages 3 months, 12 months, 18 months , and 24 months respectively). More recently, Wohlfahrt-Veje et al (Wohlfahrt-Veje C et al 2009) reported that acquired UDTs account for 58% of all cases of cryptorchidism (congenital and acquired) at 18 months, 71% at 36 months and 69% thereafter.…”