Incidence of clubfoot in Frederiksborg County, Denmark.

The incidence of congenital clubfoot in Frederiksborg County, Denmark, was studied over a period of 16 yaers (1979-1994). Altogether 60.186 living infants were born, and of these 72 had a congenital clubfoot. Twenty-five children (35%) had bilateral clubfoot and 54 (75%) were boys. The overall incidence was 1.20 per thousand children. The incidence increased significantly during the observation period and was 2.41 per thousand in 1994. We cannot explain the rising incidence. The statistical analysis is made on the base of the theory for generalized linear models.