Background: Though attention deficit, hyperactivity disorder, ADHD is a common problem in childhood. Thai teachers’ knowledge regarding the disease has never been assessed.
Objective: To identify knowledge of Thai teachers regarding ADHD and its influencing factors.
Material and Method: Cross-sectional study was operated in three primary schools in Ayutthaya, Thailand. Standardized questionnaires comprised of demographic data, ADHD experiences and the Knowledge of Attention Deficit Disorder Scale, KADDS, were distributed to participating teachers. Results were reported using frequency, percent, mean, and standard deviation. Association between demographic and ADHD experiences and the KADDS score was identified by logistic regression analysis.
Results: Lack of knowledge of ADHD among teachers was apparent. Only 19.4% of them passed the total scale of KADDS. Teachers under 31-years old were more likely to pass general information and signs, symptoms & diagnosis subscales and total scale. In addition, familiarity with ADHD patients was associated with passing scores of general information subscale and total scale.
Conclusion: Despite public awareness of ADHD, Thai teachers lacked knowledge concerning the disease. Young teachers were more acquainted with ADHD. Direct experience with ADHD patient might help teachers develop their knowledge on ADHD.

Keywords: ADHD, Teachers, Primary school, Knowledge, Associated factors, KADDS