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© 1978 Oxford University Press

research-article

A Comparison of Neural Tube Defects Identified by Two Independent Routine Recording Systems for Congenital Malformations in Northern Ireland

NC NEVIN, Professor of Medical Genetics1, J R McDONALD, Lecturer in Medical Computing2 and A L WALBY, Director of Research and Intelligence3

1 The Queen's University of Belfast Grosvenor Road, Belfast BT12 6BJ, Northern Ireland
2 Department of Medical Statistics. The Queen's University of Belfast
3 Department of Health and Social Services Northern Ireland

The efficiency of two systems for recording congenital malformations has been compared; one system, the Registrar General's Congenital Malformation Notification, is based on registering all malformed infants, and the other, the Child Health System, records all births. In Northern Ireland for three years (1974–1976), using multiple sources of ascertainment, a total of 686 infants with neural tube defects was identified among 79 783 live and stillbirths. The incidence for all neural tube defects is 860 per 1000 births. The Registrar General's Congenital Malformation Notification System identified 83.6% whereas the Child Health System identified only 63.3% of all neural tube defects. Both systems together identified 86.2% of all neural tube defects.

The two systems are suitable for monitoring of malformations and the addition of information from the Genetic Counselling Clinics would enhance the data for epidemiological studies.


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