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Area of Science:

  • Epidemiology
  • Perinatal Medicine
  • Developmental Neuroscience

Background:

  • Cerebral palsy (CP) is traditionally linked to live birth gestational age.
  • Prenatal factors like malformations, vascular insults, and maternal infection suggest CP originates before birth.
  • Viewing CP as a fetal condition offers new epidemiological insights.

Purpose of the Study:

  • To explore the epidemiologic implications of viewing cerebral palsy (CP) as a fetal condition.
  • To re-evaluate gestational age-specific CP rates using a "fetuses-at-risk" model.
  • To compare conventional and alternative epidemiological formulations for CP.

Main Methods:

  • Utilized published data from Shiga Prefecture, Japan, and North-East England.
  • Calculated conventional gestational age-specific CP rates per live birth.
  • Calculated alternative "fetuses-at-risk" CP rates per fetus at risk for a given gestation.

Main Results:

  • Conventional rates showed decreasing CP risk with increasing gestational age.
  • The "fetuses-at-risk" approach revealed increasing CP risk with longer gestational duration.
  • Rates shifted from 63.9/1,000 live births (<28 weeks) to 0.9/1,000 (≥37 weeks) conventionally.
  • Rates shifted from 0.08/1,000 fetuses (<28 weeks) to 0.9/1,000 (≥37 weeks) using the alternative model.

Conclusions:

  • The "fetuses-at-risk" model is the appropriate epidemiological approach for causal analysis of CP.
  • This formulation demonstrates that CP risk escalates with increased gestational duration.
  • This perspective may redirect research toward understanding and preventing CP more effectively.