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The researchers used the Bayley Mental Developmental Index, a form of intelligence test, to assess the children and found that exposure to moderate to high prenatal stress (MHPS) during the first or second trimesters, but not the third trimester, predicted significantly lower test scores compared with children exposed to low prenatal stress (LPS).
3 points higher on a related test, the Bayley Mental Developmental Index (MDI), which measures language, memory, and problem-solving abilities.
SAN DIEGO -- Female gender in extremely-low-birth-weight infants has a positive influence on the neurodevelopmental outcome at 18-22 months, increasing the Bayley-II Mental Developmental Index scores by 8-10 points, Dr.