Differences between pervasive (home and day-care/school) versus non-pervasive (home only) conduct problems were examined in regard to various child, parent/family, and day-care/school characteristics in an outpatient clinic sample of 120 children aged 4-8 years. All children scored above the 90th percentile on the Eyberg Child Behavior Inventory for home problems and met the criteria for a possible or a confirmed diagnosis of oppositional defiant behaviors. The proportion of children with pervasive conduct problems was high, 83%. Teachers in day care and school reported children in the pervasive group to have significantly more attention and internalizing problems as well as lower social competence scores than those in the non-pervasive group. Children in the pervasive group also showed consistently more problems in their relationships both with teachers and peers than those in the non-pervasive group. The implications for assessment and treatment of children with conduct problems in these age-groups are discussed. (Contains 3 tables.)