Component	Search terms
Attention-deficit/hyperactivity disorder (ADHD)–related terms	(((“attention deficit”) OR (“hyperactivity disorder*”) OR (“deficit hyperactiv*”) OR (“ADHD”) OR (“deficit disorder*”) OR (“minimal brain dysfunction”) OR (“minimal brain damage”) OR (“MBD”) OR (“brain injured child syndrome*”) OR (“hyperactive child syndrome*”) OR (“hyperactive syndrome*”) OR (“impulse disorder*”) OR (“hyperkinetic disease”) OR (“hyperkinetic syndrome*”) OR (“hyperkinetic reaction of childhood”)) OR ((“ADD” AND (disorder OR attention OR hyperactiv*))) OR ((“attention problem*”) OR (“inattenti*”) OR (“hyperactiv*”) OR (“hyperkines*”)))
Child health terms	AND ((“nutrition*”) OR (“deficienc*”) OR (“iron”) OR (“ferritin”) OR (“transferrin”) OR (“anemia”) OR (“copper”) OR (“zinc”) OR (“magnesium”) OR (“polyunsaturated fatty acids”) OR (“fatty acid*”) OR (“folate”) OR (“nutritional surplus*”) OR (“fat”) OR (“sugar*”) OR (“sodium”) OR (“food additive*”) OR (“food color additive*”) OR (“food color*”) OR (“FD&C Yellow”) OR (“FD&C Red”) OR (“preservatives”) OR (“sodium benzoate”) OR (“diet”) OR (“IgG”) OR (“western diet”) OR (“malnutrition”) OR (“electronic*”) OR (“television”) OR (“TV”) OR (“video game*”) OR (“screen time”) OR (“sleep”) OR (“built environment”) OR (“nature”) OR (“green space”) OR (“physical activity”) OR (“exercise”))
Social environment terms	AND ((“socioeconomic”) OR (“SES”) OR (“income”) OR (“social class”) OR (“urban*”) OR (“rural*”) OR (“conflict”) OR (“discord”) OR (“stress”) OR (“foster care”) OR (“single parent*”) OR (“institution*”) OR (“advers*”) OR (“maltreatment”) OR (“deprivation”) OR (“trauma”) OR (“rejection”) OR (“discipline”) OR (“attachment”))
Follow-up search terms	AND ((“abuse”) OR (“neglect”) OR (“involvement”) OR (“intrusive”) OR (“permissive”) OR (“sensitive”))