RESUMO
The current study attempted to investigate factors associated with attention deficit hyperactivity disorder [ADHD] in children without co-morbidities. In this case-control study, 164 ADHD children who attended the Child and Adolescent Psychiatric Clinics of Tabriz University of Medical Sciences, Iran were compared with 166 normal children selected in a random-cluster method from primary and secondary schools. Clinical interviews based on DSM-IV-TR using K-SADS were used to diagnose ADHD cases and to select the control group. Participants were matched for age. We used chi-square and binary logistic regression for data analysis. Among the associated factors with ADHD were gender and maternal employment. Boys [OR 0.54; 95% confidence interval: 0.34-0.86] and those children with working mothers [OR 0.16: 95% confidence interval: 0.06-0.86] suffered more from ADHD. The birth season, family size, birth order, and parental kinship were not among risk factors for ADHO. The results of the study show that maternal employment and male gender are among the associated risk factors for ADHD