The purpose of this study was to determine the comorbid condition with oppositional defiant disorder (ODD) among Children in Selected primary schools in Nairobi County, Kenya. Oppositional defiance disorder is a common mental health problem among children.Quasi experimental research design was used in the study with a sample of 180 respondents. Purposive sampling was used in selecting the two schools. 315 respondents completed the demographic questionnaires, Teachers and parents completed the Child and Adolescent Disruptive Behavior Inventory(CADBI).Systematic sampling method was applied on 249 participants to acquire the required sample size.Data collected was analyzed using SPSS version 23. The positive correlation showed that there was positive association between items identified for measuring ODD towards adults, ODD towards peers and ADHD in the study population at baseline survey both by the teachers and parents.This study revealed that ADHD is a comorbid condition with ODD.Psychologists shouldbe trained on the administration of CADBI in order to carry out assessment and offer timely intervention to treat the existing condition with ODD in primary schools children. This will help the children interact better with their peers and also improve their academic performance.
