title: On surveillance methods for congenital malformations.
abstract: This paper presents an 'optimal' procedure for the use of the 'sets' method, a system proposed for surveillance of congenital malformations. Comparisons over a number of examples shows that the given procedure represents a clear improvement over the one originally proposed, and, in some conditions, is more efficient than the cusum scheme.
mesh_terms: D001699:Biometry / Q000379:methods*; D000013:Congenital Abnormalities / Q000453:epidemiology*; D004812:Epidemiologic Methods; D006801:Humans; D007231:Infant, Newborn