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Searching for very early precursors of autism spectrum disorders: the Hamamatsu Birth Cohort for Mothers and Children (HBC)

  • K. J. Tsuchiya (a1) (a2), K. Matsumoto (a1), S. Suda (a1), T. Miyachi (a1), H. Itoh (a3), N. Kanayama (a3), K. Hirano (a4), T. Ohzeki (a2) (a4), N. Takei (a1) (a2) (a5) and the HBC Study Team...

Autism spectrum disorders (ASD) are life-long neurodevelopmental conditions. The pathophysiology is poorly understood, and the clinical diagnosis can only be made through behavioural assessments. The prevalence of ASD has increased eight-fold over the last three decades. Paralleling this rise, research interest in the disorder has been accumulating, centering on two aspects: risk factors that would explain the increase in prevalence, and precursors that could predict an emergence of ASD prior to 2 years of age. As regard factors responsible for the increased prevalence, an increasing trend of low birthweight (4.2% in 1980 v. 9.6% in 2006 at Japan) and advanced paternal age at birth are potentially implicated. To explore these issues, and to yield an early diagnostic algorithm for ASD, the authors initiated the ongoing Hamamatsu Birth Cohort for Mothers and Children (HBC) in 2007. The strengths of the HBC include frequent, direct face-to-face assessments of all the participating mothers and children during the first 4 years of life (12 assessments); this depth of assessments will disclose subtle changes in the developmental domains of individuals with ASD, which might otherwise be overlooked.

A total of 1200 pregnant women are to be recruited by the end of 2010. Assembled information comprises a range of variables related to the mother’s characteristics and child development. The comprehensiveness of the HBC will provide an informative data source that will elucidate early trajectories of children with ASD in addition to revealing detailed, developmental properties of typically developing children.

Corresponding author
Address for correspondence: Dr K. J. Tsuchiya, Handayama 1 Higashiku, Hamamatsu 431-3192, Japan. (Email
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