However, birth defects surveillance data typically are not final until approximately 24 months after the end of the birth year, and this release of data only 12 months after the end of the birth year likely resulted in less complete ascertainment
of birth defects in late 2016 compared with early 2016.
The reason is that the improvement of the diagnosis and identification of congenital heart defects over time have resulted in a complete ascertainment
of these groups of anomalies in the registry.
More complete ascertainment
is needed globally to better understand pertussis epidemiology and transmission, thereby facilitating the development of improved vaccines and vaccination strategies to improve future disease control.
Studies with complete ascertainment
of prenatally diagnosed NTD cases indicate that fortification has prevented up to 50% of NTDs (1).
Study design and validity This population-based cross-sectional study applied strict 2-dimensional echocardiographic criteria and used a careful strategy to ensure complete ascertainment
of MVP in the population.
Third, passive reporting systems tend to have less complete ascertainment
of all birth defects compared with active surveillance systems (9).
Rates of Down syndrome at livebirth by one-year maternal age intervals in studies with apparent close to complete ascertainment
in populations of European origin: a proposed revised rate schedule for use in genetic and prenatal screening.
A more complete ascertainment
of deaths requires electronic linkage to a national death data file, such as SSDMF or the National Death Index.
First, legally mandated laboratory reporting of test results is essential for complete ascertainment
The higher occupational homicide rate determined by AOISS may be, in part, the result of more complete ascertainment
of incidents in Alaska than in the remainder of the United States.