Sources of variability in birth defects prevalence rates

Abstract

We conclude that while some variability is expected due to differences in the true prevalence of birth defects, extreme differences among states are more likely due to differences in surveillance practices. The Birth Defects Prevention Act prompted new initiatives to develop birth defect surveillance systems, but there are no nationally agreed upon standards in existence to guide the process. This study was performed in support of developing standards that will influence new and existing state surveillance systems.