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Reporting of congenital malformations on birth certificates.

ONE CONCERN of the epidemiologist who uses information from birth certificates to study congenital malformations is that he does not know how to estimate the underreporting inherent in these data. In a previous study (1) we attempted to determine which factors might influence the reporting of malformations on birth certificates, and we demonstrated that completeness of reporting was related to severity and ease of recognition of individual malformations and was apparently not biased by variables descriptive of infants or their parents. There was also an indication that birth certificates prepared in some hospitals were more complete with regard to congenital malformations than were those from other hospitals. In this report, we explore the possibility of relationships between selected characteristics of hospitals and completeness of malformation reporting on birth certificates.