400 mg corn oil per day for 6 months

The Weschler Intelligence Scales for Children-V Digit Span and Picture Span subtests assess working memory. The working memory index composite score has a range from 30-170 (mean=100; SD=15). A low score indicates poor performance, and a high score indicates best performance.

The Kaufman Test of Educational Achievement-3 is an assessment of key academic skills. The Letter and Word Recognition, Math Computation, Object Naming Facility, and Associative Fluency Subtests measure children's reading, math, and written language skills. The standard score has a range from 30-170 (mean=100; SD=15). A low score indicates poor performance, and a high score indicates best performance.

To assess children's body composition, height (in centimeters) is measured. This is converted to a z score for age and sex based on Child Growth Standards from the World Health Organization. The z score indicates the number of standard deviations away from the mean. A z score of 0 is equal to the mean of a reference population (children the same age and sex). Values less than 0 indicate values lower than the reference population, while values greater than 0 indicate values higher than the reference population.

To assess children's body composition, weight (in kilograms) is measured. This is converted to a z score for age and sex based on Child Growth Standards from the World Health Organization. The z score indicates the number of standard deviations away from the mean. A z score of 0 is equal to the mean of a reference population (children the same age and sex). Values less than 0 indicate values lower than the reference population, while values greater than 0 indicate values higher than the reference population.

To assess children's adiposity, a bioelectric impedance is used to measure body fat percent. Child's height and weight will be combined to report BMI (kg/m^2). These measurements are converted to a z score for age and sex based on Child Growth Standards from the World Health Organization. The z score indicates the number of standard deviations away from the mean. A z score of 0 is equal to the mean of a reference population (children the same age and sex). Values less than 0 indicate values lower than the reference population, while values greater than 0 indicate values higher than the reference population.

The Behavior Rating Inventory of Executive Function, 2nd ed., is completed by the child's caregiver and teacher to measure a range of executive functioning capabilities in children. The BRIEF-2 yields nine clinical scales that measure various aspects of executive function plus three broad indices: behavioral regulation, emotion regulation, and cognitive regulation. Scores are summed to obtain a Global Executive Composite Score that will be expressed as a t score (range= [35-90]; (mean=50; SD=10), where a higher score indicates greater dysregulation .

The Teacher Report Form (syndrome and DSM-Oriented subscales) is completed by the child's teacher to reflect on the child's behavior in the previous six months. Scores are summed to provide a total problems score. Scores are also computed to measure the following subscales: internalizing problems, externalizing problems, anxious/depressed, withdrawn/depressed, somatic complaints, social problems, thought problems, attention problems, rule-breaking behavior, aggression behavior, affective problems, anxiety problems, somatic problems, attention deficit/hyperactivity problems, oppositional defiant problems, conduct problems. Scores will be expressed as a t-score (range= [33-100]; mean=50; SD=10), where a lower score indicates a more optimal outcome.

The Child Behavior Checklist is completed by the child' caregiver to reflect their child's behavior in the previous six months. Scores were summed to provide total competence and problem scores. Total competence scores will be expressed as a t-score (range= [20-100]; mean=50; SD=10), where a higher score reflects a more optimal outcome. Problem scores will be expressed as a t-score (range= [25,100]; mean=50; SD=10), where a lower score reflects a more optimal outcome.

The National Survey of Children's Health module captures child developmental and behavioral diagnoses and other major diagnoses via parent report . A binary variable will be formed to indicate if a child has been diagnosed with each condition.

The Emotion Regulation Checklist is completed by the child's caregiver to measure child's ability to manage their emotions. Scores are grouped and summed to yield two scales: Emotion Regulation (range=10-40) and Lability/Negativity (range=14-56). Higher scores on the Emotion Regulation scale indicates more ability to regulate, whereas higher scores on the Lability/Negativity scale reflect greater dysregulation .

The NIH Toolbox Friendship (Ages 8-17) Fixed Form is a 5-item questionnaire that measures peer relationships and assesses the quality of relationships with friends and other acquaintances over the past month. Scores will be expressed as a t-score (range= [16-68]; mean=50; SD=10), where a higher score indicates stronger peer relationships.

The NIH Toolbox Positive Peer Interaction Form (Ages 3-12) is a 4-item questionnaire that measures child peer relationships via parent report. Scores will be expressed as a t-score (range= [-8-63] ; mean=50; SD=10), where a higher score indicates stronger peer relationships.

The Child Sleep Habits Questionnaire-abbreviated measures child sleep pattern and behaviors via parent report. Parents are asked to report on the child's bedtime behavior, sleep duration, and behavior during sleep. Scores are summed to give the total sleep disturbance score (range 33-99). Scores are also grouped and summed to yield eight subscales that measure different aspects of sleep. A higher score is indicative of more sleep problems .