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Maternal age and Down syndrome: age-specific incidence rates by single-year intervals
Insights
This study provides precise maternal age-specific risks for Down syndrome (DS) births. These findings aid genetic counseling and prenatal diagnosis program evaluations.
Area of Science:
- Reproductive genetics
- Perinatal epidemiology
- Medical statistics
Background:
- Accurate maternal age-specific risks for Down syndrome (DS) are crucial for genetic counseling and prenatal screening program assessments.
- Previous studies have limitations in ascertainment completeness, impacting the reliability of DS risk data by single-year maternal age intervals.
Purpose of the Study:
- To determine precise maternal age-specific risks for Down syndrome (DS) using single-year age intervals.
- To provide updated data for genetic counseling and cost-benefit analyses of prenatal diagnosis programs.
Main Methods:
- Linked records of 519 children with Down syndrome (DS) from the British Columbia Health Surveillance Registry (BCHSR) to birth registrations.
- Analyzed data from 354,880 live births in British Columbia between 1961 and 1970.
- Derived maternal ages at birth for affected children to calculate age-specific DS risks.
Main Results:
- Presented maternal age-specific risks for Down syndrome (DS) by single-year maternal age intervals.
- The study achieved a high level of ascertainment for Down syndrome cases.
- Results were compared with a previous study that had significantly lower ascertainment completeness (estimated at 38%).
Conclusions:
- The study provides reliable, detailed data on Down syndrome (DS) risks across single-year maternal age groups.
- This information enhances the precision of genetic counseling and the evaluation of prenatal diagnostic strategies.
- High ascertainment ensures the validity of the derived maternal age-specific risks for Down syndrome.
Abstract:
Maternal age-specific risks of giving birth to a child with the Down syndrome (DS) are given by single-year age intervals. Such data are of value for more precise genetic counseling and in cost-benefit analyses of prenatal diagnosis programs. The data were obtained by linking records of children with DS at the British Columbia Health Surveillance Registry ( BCHSR ) to the appropriate birth registrations to derive maternal ages. The data related to 519 affected children out of a total of 354,880 live births in British Columbia between 1961 and 1970. The results, which are based on a high level of ascertainment, are compared to those reported in the only other published study relating to risks by single-year maternal age groupings, where completeness of ascertainment was estimated to be only 38%.