A population-based study of prevalence of Down syndrome in Southern Thailand
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A population-based study of prevalence of Down syndrome in Southern Thailand Somchit Jaruratanasirikul, Ounjai Kor-anantakul, Montira Chowvichian, Wannee Limpitikul, Pathikan Dissaneevate, Nitthakarn Intharasangkanawin, Atchara Sattapanyo, Sermsri Pathompanitrat Songkhla, Thailand
Methods: Data were obtained from a populationbased surveillance study undertaken during 2009-2013. Entries in the birth defects registry included live births, stillbirths after 24 weeks gestational age, and terminations of pregnancy following prenatal diagnosis. Infants with clinical characteristics of DS had a chromosomal study to make a definite diagnosis. Results: Of the total 186 393 births recorded during the study period, 226 DS cases were listed, giving a prevalence of 1.21 per 1000 births [95% confidence interval (CI) 1.05-1.37]. The median maternal age was 36.5 years with a percentage of maternal age ≥35 years of 60.6%. Seventy-seven cases (34.1% of all cases) were diagnosed prenatally and these pregnancies were terminated. The prevalence of DS per 1000 births was significantly higher in older women, from 0.47 (95% CI 0.28-0.67) in mothers aged
