Congenital malformations at a referral hospital in Gorgan, Islamic Republic of Iran.

This study recorded the rate of congenital malformations in 10000 births at a referral hospital in Gorgan, Islamic Republic of Iran in 1998-99. The overall incidence of congenital malformations was 1.01% (1.19% in males and 0.76% in females). Anomalies of the musculoskeletal system had the highest incidence (0.38%), followed by central nervous system (0.28%) and genitourinary system (0.25%). The incidence of congenital malformations in different ethnic groups was 0.85%, 1.45% and 1.70% in native Fars, Turkman and Sistani groups respectively. Sex and ethnic background are factors in the rate of congenital malformations in this area.