This population-based birth cohort study examines whether mild maternal hypothyroxinemia in early pregnancy is related to symptoms of attention-deficit/hyperactivity disorder in children at 8 years of age.
To examine the associations between active commuting to school and cognitive performance in adolescents.
Five cities (Granada, Madrid, Murcia, Santander, and Zaragoza) in Spain.
A total of 1700 adolescents (892 girls) aged 13 to 18.5 years.
Mode and duration of transportation to school and participation in extracurricular physical activity were self-reported.
Cognitive performance (verbal, numeric, and reasoning abilities and an overall score) was measured by the Spanish version of the SRA Test of Educational Ability.
Active commuting to school was associated with better cognitive performance (all P < .05) in girls but not in boys, independent of potential confounders including participation in extracurricular physical activity. In addition, adolescent girls who spent more than 15 minutes actively commuting to school had better scores in 3 of the 4 cognitive performance variables (all P < .05) than those who spent less time actively commuting to school (≤15 minutes) as well as better scores in all of the cognitive performance variables (all P < .001) than girls inactively commuting.
Active commuting to school and its duration may positively influence cognitive performance in adolescent girls.