Demographics of idiopathic clubfoot: is there a seasonal variation?

A seasonal variation in the incidence of idiopathic clubfoot has been reported. The purpose of this study was to determine whether a seasonal variation existed in the authors' population. The medical records of 245 children who presented with idiopathic clubfoot were reviewed. Expected month of birth, month of conception, and season of birth were determined. National Vital Statistics Reports for Births: Final Data for 2001 provided comparison data. The authors' group differed from the national data, with a male predominance and a greater percentage of mothers less than 25 years old at delivery, but was similar in regard to infants born preterm, cesarean delivery, and low birthweight. Analysis failed to identify a monthly or seasonal variation in the authors' population.