Maternal and Child's Thyroid Function and Child's Intellect and Scholastic Performance

Area of Science:

• Endocrinology
• Neurodevelopment
• Public Health

Background:

• Maternal thyroid dysfunction and hypothyroxinemia are potential risk factors for adverse child neuropsychological development.
• Previous research findings on this association have been inconsistent, necessitating further investigation.

Purpose of the Study:

• To investigate the association between maternal thyroid dysfunction during early pregnancy and the child's long-term neuropsychological development.
• To examine the impact of adolescent's own thyroid function on their academic performance.

Main Methods:

• Utilized the Northern Finland Birth Cohort 1986, including maternal serum samples from early pregnancy and child samples at 16 years.
• Analyzed thyrotropin, free thyroxine (fT4), and thyroid peroxidase antibodies in maternal and adolescent samples.
• Assessed school performance via teacher evaluations at age eight and self-evaluations at age 16, alongside data on intellectual deficiencies.

Main Results:

• Maternal subclinical hypothyroidism was associated with increased self-reported math difficulties in adolescent girls.
• Maternal hypothyroxinemia correlated with higher rates of grade repetition in adolescent boys.
• Maternal and adolescent thyroid dysfunction were linked to poorer self-evaluated academic performance in specific subjects.

Conclusions:

• Maternal thyroid dysfunction in early pregnancy is associated with impaired scholastic performance in adolescents.
• Adolescents' own thyroid dysfunction also correlates with difficulties in academic performance, particularly in self-assessments.