THE RELATIONS BETWEEN THYROID HORMONES AND CLINICAL FEATURES OF TURKISH CHILDREN AND ADOLESCENTS WITH ADHD AND ADHD-NOS: A PRELIMINARY STUDY

The aim of this study was to compare the levels of thyroid hormones in children with ADHD and ADHD-NOS and to assess the relationship between ADHD symptom severity, anxiety symptom severity and thyroid hormone levels. The study was planned as a cross-sectional, retrospective study. The records of patients who applied to the study center in between January 2012 and January 2013 were screened and 205 ADHD and ADHD-NOS cases' records were evaluated. Both groups were compared according to thyroid hormon levels. The diagnosis of 205 patients' records and their comorbid psychiatric disorders was made clinically. ADHD symptom severity was assessed by Turgay DSM-IV-Based Child and Adolescent Behavior Disorders Screening and Rating Scale (T-DSM-IV-S). Anxiety symptom severity was assessed by The Screen for Anxiety Related Emotional Disorders (SCARED). Groups were compared with parametric or non-parametric methods according to assumptions of normality. P was set at 0.05 (two-tailed). Among the whole sample, 99 (48.3 %) patients were ADHD, and 106 (51.7 %) patients were ADHD- NOS. The average age of the children in the ADHD group was 10.88 ± 3.02 years, and the average age of the children in the NOS-ADHD group 9.93 ± 2.49 years. Thyroid hormone levels were detected in 81 of 205 patients participating in the study. We found statistically significantly higher T4 levels in the ADHD group compared to the ADHD-NOS group (p=0.006). A statistically significant negative correlation between the total number of diagnoses and T4 level was noted (p=0.001). TSH levels correlated significantly with T-DSM-IV-S total score and symptom counts in the Hyperactivity subscale of this measure. Thyroid hormone levels may be affected in children with impairing ADHD symptoms and increased comorbidities. Our results should be supported with future studies.