Population characteristics of 128 boys with congenital cryptorchidism and 2,368 healthy boys from a joint Danish-Finnish birth cohort study.

Values are given as numbers (n) and percentages (%).*All variables adjusted for country, maternal age, smoking, alcohol consumption and social class. Furthermore, adjusted for parity, twinning, mode of delivery, presentation, birth weight (except WGA) and gestational age (except WGA), mutually.**SGA: small for gestational age, AGA: appropriate for gestational age, LGA: large for gestational age.