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[Down's syndrome in the Netherlands]
Tijdschrift Voor Kindergeneeskunde
|August 1, 1986
Summary
This study found a lower-than-expected frequency of Down syndrome (DS) in older mothers. This suggests underreporting of DS cases in older maternal age groups, particularly those aged 40 and above.
Area of Science:
- Genetics and Genomics
- Epidemiology
- Reproductive Health
Context:
- Analysis of 348 patients with Down syndrome (DS) born in the Netherlands between 1981-1982.
- Inclusion of prenatal and postnatal chromosome study data up to December 1984.
- Comparison with a reference group from five comparable epidemiological studies.
Purpose:
- To determine Down syndrome (DS) rates across different maternal age groups.
- To compare observed DS frequencies with established epidemiological data.
- To investigate potential underdiagnosis or underreporting in specific maternal age demographics.
Summary:
- DS rates were calculated for five-yearly maternal age classes.
- A notably lower frequency of DS was observed in mothers aged 40 years and older compared to reference data.
- It is hypothesized that DS cases in older maternal age groups (40-44 and ≥45) may be underreported or not yet referred for cytogenetic analysis.
Impact:
- Highlights the need for improved ascertainment and reporting of Down syndrome (DS) cases, especially in older maternal populations.
- Suggests potential biases in epidemiological data collection related to maternal age.
- Informs future research on DS prevalence and diagnostic practices across diverse demographic groups.