World Journal of Pediatrics

, Volume 13, Issue 1, pp 63–69 | Cite as

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
  • H. Sriplung
Original article



Down syndrome (DS) is the most common chromosomal disorder that causes mental retardation. In 2009, a population-based birth defects study was implemented in three provinces in southern Thailand. This study aimed to determine the prevalence of DS in the studied regions, and the proportion of DS fetuses detected by prenatal screening.


Data were obtained from a population-based 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.


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 <30 years to 0.88 (95% CI 0.59-1.17) in mothers 30-<35 years (P<0.01), and to 4.74 (95% CI 3.95-5.53) in mothers ≥35 years (P<0.001).


The prevalence of DS significantly increased with maternal age. About 35% of DS cases were detected prenatally and later terminated. Hence, examining only registry live births will result in an inaccurate prevalence rate of DS.

Key words

birth defect registry Down syndrome prenatal screening termination of pregnancy trisomy 21 


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This research was supported by the Birth Defects Association (Thailand) and the Thai Health Promotion Foundation. The authors gratefully thank the staff of the 466 hospitals for their assistance with data collection. The authors thank Mr. David Patterson from the International Affairs Office in the Faculty of Medicine, Prince of Songkla University, for editorial help.


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Copyright information

© Children's Hospital, Zhejiang University School of Medicine and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Somchit Jaruratanasirikul
    • 1
    • 6
  • Ounjai Kor-anantakul
    • 1
  • Montira Chowvichian
    • 1
  • Wannee Limpitikul
    • 2
  • Pathikan Dissaneevate
    • 3
  • Nitthakarn Intharasangkanawin
    • 4
  • Atchara Sattapanyo
    • 5
  • Sermsri Pathompanitrat
    • 5
  • H. Sriplung
    • 1
  1. 1.Faculty of MedicinePrince of Songkla UniversityHat Yai, SongkhlaThailand
  2. 2.Medical Education Center Songkhla HospitalSongkhlaThailand
  3. 3.Medical Education Center Hatyai HospitalSongkhlaThailand
  4. 4.Medical Education Center Trang HospitalSongkhlaThailand
  5. 5.Phatthalung HospitalSongkhlaThailand
  6. 6.Department of Pediatrics, Faculty of MedicinePrince of Songkla UniversityHat Yai, SongkhlaThailand

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