Table 1.

Inclusion and exclusion criteria for ADHD and non-ADHD groups.

Criteria for Inclusion into the ADHD Group	Criteria for Inclusion into the Non-ADHD Group	Criteria for Exclusion from ADHD and Non-ADHD Groups
Children of both sexes aged 6–17	Children of both sexes aged 6–12	Children with disorders of central nervous system (e.g., epilepsy, serious injuries, and CNS infections)
Children with diagnosed ADHD in accordance with ICD-10 and DSM-V diagnostic criteria (diagnosis confirmed by two independent psychiatrists based on a standardized and structured interview)	Lack of mental disorders—assessment with the use of MINI-Kid questionnaire	Co-existing: schizophrenia, bipolar affective disorder, any serious somatic disorders
Clinically significant ADHD symptoms lasting over 6 months	Parent or legal guardian approval	Chronic somatic diseases
Children without hereditary mental disorders (first-degree relatives)		Persistent pharmacotherapy, hormonotherapy
Parent or legal guardian approval		Lack of acceptance from parents or legal guardians

ADHD—Attention-Deficit/Hyperactivity Disorder; ICD-10—International Statistical Classification of Diseases and Related Health Problems (10th edition); DSM-V—Diagnostic and statistical manual of mental disorders (5th ed.); MINI-Kid—MINI International Neuropsychiatric Interview for Kids; CNS—Central Nervous System.