Summary
235 cases of Down's syndrome were ascertained in a 10-year study of Down's syndrome in Western Australia. Although cytogenetic studies performed on 222 subjects confirmed that 95% of cases were trisomic due to nondisjunction, 4% were trisomic due to translocation, and 1% were mosaic, the ratio of inherited/sporadic translocations differed from that usually reported. Comparison of the results with those of an earlier Australian survey of Down's syndrome demonstrated a real fall in the incidence of Down's syndrome in Australia but no significant change in maternal age-specific incidences.
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Mulcahy, M.T. Down's syndrome in Western Australia: Cytogenetics and incidence. Hum Genet 48, 67–72 (1979). https://doi.org/10.1007/BF00273276
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DOI: https://doi.org/10.1007/BF00273276